Patent Publication Number: US-2023137749-A1

Title: Base, circuit breaker with base, and power distribution equipment

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
     This application is a continuation of International Application No. PCT/CN2020/099599, filed on Jun. 23, 2020, the disclosure of which is hereby incorporated by reference in its entirety. 
    
    
     TECHNICAL FIELD 
     This application relates to the technical field of power distribution equipment, and in particular, to a base, a circuit breaker with a base, and power distribution equipment. 
     BACKGROUND 
     Circuit breakers, as line overload or short-circuit fault protection devices, are widely used in various circuits because they have the advantage of being recoverable and reusable in comparison with fuses. 
     To facilitate the unified management of circuit breakers of a plurality of circuits, the circuit breakers of the plurality of circuits are usually mounted together in one power distribution equipment, and are connected in series and arranged as one row by means of one rail, or connected in series and arranged as a plurality of rows by means of a plurality of parallel rails. For an upgrade of current specifications of these circuit breakers, not only the circuit breakers but also cables and terminals connected to the circuit breakers need to be replaced. Therefore, the upgrade of the circuit breakers is difficult and costly. To resolve this problem, a base compatible with circuit breakers of various current specifications may be mounted on the rail in the power distribution equipment. Cables and terminals connected to the base can transmit currents of various specifications, and the circuit breakers are detachably connected to the base. In this way, a circuit breaker can be upgraded simply by removing and replacing the circuit breaker from the base. Therefore, the upgrade operation of the circuit breaker is simple and easy to manage. However, at least one base is designed for each circuit breaker. As there are a large number of circuit breakers in the power distribution equipment, there are also a large number of corresponding bases, which greatly increases the costs. 
     SUMMARY 
     This application provides a base, a circuit breaker with a base, and power distribution equipment, which can reduce the costs of the base. 
     To achieve the foregoing objectives, the following technical solutions are used in embodiments of this application. 
     According to a first aspect, some embodiments of this application provide a base. The base includes an insulating housing. The insulating housing has a first surface and a second surface that are away from each other. The first surface is configured for a detachable connection of a circuit breaker. The second surface is provided with a first mounting slot. The insulating housing can be slidably snapped into a mounting rail in power distribution equipment by means of the first mounting slot. An accommodating cavity is provided in the insulating housing, and the accommodating cavity is configured to accommodate a conductive connection member. One end of the accommodating cavity is open along a sliding direction of the insulating housing relative to the mounting rail, and the other end thereof is closed. 
     When a plurality of bases provided in the embodiments of this application are mounted on the mounting rail, accommodating cavities of the plurality of bases are open toward the same direction, and in every two adjacent bases, a first wall plate of one base covers the opening of the accommodating cavity of the other base, thereby achieving the insulation isolation between conductive connection members of the two adjacent bases. Therefore, the insulating housing of the base does not need to be designed as an enclosed housing, and the material costs of the insulating housing as well as the costs of the base are relatively low. For power distribution equipment provided with a large number of bases, the costs can be significantly reduced. 
     Optionally, the insulating housing includes a bottom arm portion and two side arm portions. One end of each of the two side arm portions is connected to either end of the bottom arm portion along a first direction, and the other end of each of the two side arm portions extends toward the same side of the bottom arm portion along a second direction. The bottom arm portion and the two side arm portions enclose a second mounting slot, and the second mounting slot is configured for snap-fitting of the circuit breaker. The inner surface of the second mounting slot and the surfaces of the side arm portions away from the bottom arm portion constitute the first surface of the insulating housing, and the surface of the bottom arm portion away from the second mounting slot constitutes the second surface. The sliding direction of the insulating housing relative to the mounting rail, the first direction, and the second direction are perpendicular to each other. In this way, the circuit breaker can be detachably snapped into the second mounting slot through the opening at one end of the second mounting slot away from the bottom arm portion. The snapping operation of the circuit breaker is simple, and the assembly and disassembly efficiency are relatively high. 
     Optionally, the insulating housing is provided with a first connection port and a second connection port. Both the first connection port and the second connection port are in communication with the accommodating cavity. The first connection port is configured to allow the terminal of the circuit breaker to extend into the accommodating cavity when the circuit breaker is connected to the first surface. The second connection port allows the cable terminal to extend into the accommodating cavity. The base further includes a conductive connection member. The conductive connection member is provided in the accommodating cavity, and the conductive connection member includes a first conductive connection portion and a second conductive connection portion that are electrically connected. The first conductive connection portion is disposed close to the first connection port, and the first conductive connection portion is configured to be electrically connected to the terminal of the circuit breaker. The second conductive connection portion is disposed close to the second connection port, and the second conductive connection portion is configured to be electrically connected to the cable terminal. In this way, the electrical connection between the circuit breaker and the cable can be achieved. 
     Optionally, the first conductive connection portion is a U-shaped conductive elastic sheet, and a slot is formed between two elastic arms of the U-shaped conductive elastic sheet. The slot is configured for the plugging of the terminal of the circuit breaker when the circuit breaker is connected to the first surface. In this way, the electrical connection between the first conductive connection portion and the terminal of the circuit breaker is achieved by means of plugging, providing better stability of the electrical connection. 
     Optionally, the edge of one end of each of the elastic arms of the U-shaped conductive elastic sheet that surround the opening of the slot is provided with at least one notch, which extends toward a bottom wall of the slot to partition the elastic arm into a plurality of elastic arm units. The elastic arm unit includes an abutting portion, which is a portion that touches the terminal of the circuit breaker when the terminal of the circuit breaker is plugged into the slot. Distances between abutting portions of the plurality of elastic arm units and the bottom wall of the slot in the depth direction of the slot are different. In this way, the elastic arm is split into a plurality of elastic arm units having independent abutting portions, and time of contact between the abutting portions of the plurality of elastic arm units and the terminal of the circuit breaker during the plugging of the circuit breaker is different. During the plugging of the circuit breaker when the base is powered on, an electric arc is generated on an elastic arm unit that is first touched, thereby sacrificing electrical performance of the elastic arm unit. Therefore, the terminal of the circuit breaker can be effectively electrically connected to the remaining elastic arm units after being plugged into the slot. In this way, the elastic arms of the U-shaped conductive elastic sheet are prevented from being completely sacrificed due to the electric arc during the plugging of the terminal. 
     Optionally, the base further includes a U-shaped securing sleeve. The U-shaped securing sleeve is made of plastic or metal, and the U-shaped securing sleeve has elasticity. The U-shaped securing sleeve covers the U-shaped conductive elastic sheet to secure the relative positions of the plurality of elastic arm units of the U-shaped conductive elastic sheet, and increase an elastic clamping force between the two elastic arms of the U-shaped conductive elastic sheet, so that the U-shaped conductive elastic sheet can be in effective contact with and electrically connected to the terminal of the circuit breaker. 
     Optionally, a cable terminal plug-in slot is provided at a position close to the second connection port in the accommodating cavity, and the opening of the cable terminal plug-in slot is opposite the second connection port. The second conductive connection portion constitutes one side wall of the cable terminal plug-in slot. The base further includes an elastic member. The elastic member constitutes the other side wall of the cable terminal plug-in slot opposite the second conductive connection portion. The elastic member is configured to apply an elastic pressing force toward the second conductive connection portion to the cable terminal when the cable terminal is plugged into the cable terminal plug-in slot through the second connection port, so as to crimp the cable terminal onto the second conductive connection portion. In this way, the secured relative position of and the electrical connection to the second conductive connection portion can be achieved immediately when the cable terminal is plugged into the cable terminal plug-in slot. This connection method is convenient to operate and has high efficiency. In addition, the design of the elastic force of the elastic member can ensure the stability of the connection between the cable terminal and the second conductive connection portion, preventing the cable terminal from falling off. 
     Optionally, the elastic member is an elastic sheet. The elastic sheet includes a fixed portion and an elastic arm portion. The fixed portion is fixed relative to the insulating housing. One end of the elastic arm portion is connected to the fixed portion, and the other end of the elastic arm portion extends toward the second conductive connection portion and inclines toward the direction away from the second connection port. The elastic arm portion constitutes the other side wall of the cable terminal plug-in slot opposite the second conductive connection portion. In this way, during the plugging of the cable terminal into the cable terminal plug-in slot through the second connection port, the head of the cable terminal presses the elastic arm portion, so that the elastic arm portion is bent and deformed to accumulate an elastic force, which is directed to the second conductive connection portion. When the bending deformation produced by the elastic arm portion reaches a specific level, the accumulated elastic force can crimp the cable terminal onto the second conductive connection portion, so as to achieve the secured relative position and the electrical connection between the cable terminal and the second conductive connection portion. This structure is simple and easy to implement. 
     Optionally, the base further includes an unlocking device. The unlocking device is configured to drive the elastic arm portion to move away from the second conductive connection portion, so as to release the elastic pressing force applied to the cable terminal. In this way, when an error occurs during the installation of the cable and the base or in the later maintenance process of the base, the elastic arm portion may be driven by the unlocking device to move away from the second conductive connection portion, so as to release the elastic pressing force applied to the cable terminal, and the cable terminal is unplugged from the cable terminal plug-in slot to implement the removal of the cable terminal from the base. 
     Optionally, the unlocking device is a pull cord connected to the elastic arm portion, and the elastic arm portion can be pulled with the pull cord to move away from the second conductive connection portion. 
     Optionally, the elastic sheet further includes a connection portion, and one end of the elastic arm portion is connected to the fixed portion by means of the connection portion. The unlocking device includes a push rod and a first locking structure. A slide hole is provided at a position opposite the connection portion on the wall plate of the insulating housing in which the second connection port is located. The push rod slides through slide hole, and can slide to a first position in the direction toward the connection portion, to press the connection portion to bend in the direction away from the slide hole and drive the elastic arm portion to move away from the second conductive connection portion, so as to release the elastic pressing force applied to the cable terminal. The first locking structure is configured to secure a relative position between the push rod and the slide hole in the axial direction of the slide hole after the push rod slides to the first position. This structure of the unlocking device is simple and easy to implement. 
     Optionally, the first locking structure includes a first slider and a first slide groove. The first slider is provided on a side wall of the push rod. The first slide groove is provided on an inner wall of the slide hole. The first slide groove includes a first slide groove section and a second slide groove section. The first slide groove section extends along the axial direction of the slide hole, the second slide groove section extends along the circumferential direction of the slide hole, and one end of the second slide groove section is connected to one end of the first slide groove section close to the connection portion. The first slider is slidably connected in the first slide groove, and the first slider slides in the first slide groove section during the sliding of the push rod to the first position. When the push rod slides to the first position, the first slider slides to the end of the first slide groove section close to the connection portion. After the push rod slides to the first position, the first slider can slide from the first slide groove section into the second slide groove section. In this way, after the push rod slides to the first position, the push rod may be rotated, and the first slider may be driven to slide from the first slide groove section into the second slide groove section, thereby securing the relative position between the push rod and the slide hole in the axial direction of the slide hole and keeping the push rod in the first position. This structure is simple and easy to implement. 
     Optionally, one end of the push rod away from the connection portion is outside the insulating housing, and a stopper protrusion is provided on a side wall of the end of the push rod away from the connection portion. The stopper protrusion is spaced from the insulating housing. When the push rod slides to the first position in the direction toward the connection portion, the stopper protrusion abuts against an outer surface of the insulating housing. In this way, the stopper protrusion can prevent the push rod from falling into the inner space of the insulating housing through the slide hole. This structure is simple and easy to implement. 
     Optionally, the base further includes a cover plate and a second locking structure. One end of the cover plate is rotatably connected to the end of the side arm portion away from the bottom arm portion. An axis of rotation of the cover plate is parallel to the sliding direction of the insulating housing relative to the mounting rail. The cover plate can be rotated from a second position to a third position in the direction toward the second mounting slot. When the cover plate is in the second position, the cover plate does not cover the opening of the second mounting slot. When the cover plate is in the third position, the cover plate covers the opening of the second mounting slot. The second locking structure is provided between the cover plate and the side arm portion. The second locking structure is configured to secure a relative position between the cover plate and the side arm portion when the cover plate is rotated to the third position. In this way, the cover plate can prevent the circuit breaker from falling out of the second mounting slot, so that the mounting stability of the circuit breaker on the base can be improved. 
     Optionally, the second locking structure includes an elastic snapping arm and a snapping notch. The elastic snapping arm is provided on the cover plate, and the elastic snapping arm extends along the sliding direction of the insulating housing relative to the mounting rail. The snapping notch is provided on the side arm portion, and the opening of the snapping notch faces the second mounting slot. When the cover plate is rotated to the third position, the elastic snapping arm is snapped into the snapping notch. This structure is simple and easy to implement. In addition, when an acting force applied to the cover plate can overcome an elastic snapping force between the elastic snapping arm and the snapping notch, the cover plate can be driven to return to the second position to expose the opening of the second mounting slot. At this time, the circuit breaker can be replaced or mounted. 
     Optionally, the base further includes a third locking structure. The third locking structure is configured to secure a relative position between the elastic snapping arm and the snapping notch when the cover plate is rotated to the third position. In this way, the cover plate is double-locked, so that the cover plate can effectively prevent the circuit breaker from falling out of the second mounting slot. 
     Optionally, the third locking structure includes a second slide groove, a second slider, a stopper buckle, and a stopper slot. The second slide groove is provided on the cover plate, and the second slide groove extends along a direction that is parallel to the cover plate and that is perpendicular to the axis of rotation of the cover plate. The second slider is slidably connected in the second slide groove, and the second slider can slide from a fourth position to a fifth position along the second slide groove in the direction toward the axis of rotation of the cover plate. The stopper buckle is provided on the second slider, and the stopper slot is provided on a bottom surface of the second slide groove. When the second slider slides from the fourth position to the fifth position, the second slider drives the stopper buckle to be slidably snapped into the stopper slot, and makes the stopper buckle abut against a surface of the elastic snapping arm away from the axis of rotation of the cover plate. In this way, the elastic snapping arm can be locked in the snapping notch to secure the relative position between the elastic snapping arm and the snapping notch. This structure is simple and easy to implement. In addition, when an acting force applied to the second slider can overcome an elastic snapping force between the stopper buckle and the stopper slot, the second slider can be driven to return to the fourth position to unlock the elastic snapping arm, so that the elastic snapping arm can slide out of the snapping notch under the action of an external force. 
     Optionally, the second slide groove includes a third slide groove section and a fourth slide groove section, and the fourth slide groove section is located on the side of the third slide groove section away from the axis of rotation of the cover plate. When the second slider is in the fourth position, the second slider is located in the fourth slide groove section, and is not located in the third slide groove section. When the second slider is in the fifth position, the second slider is located in the third slide groove section, and is not located in the fourth slide groove section. A bottom surface of the third slide groove section is provided with a first sign, and a bottom surface of the fourth slide groove section is provided with a second sign. The first sign is different from the second sign. Therefore, it can be determined from the first sign and the second sign that the elastic snapping arm is in the unlocked state or the locked state. 
     Optionally, the base further includes a temperature measurement module and a fourth locking structure. The temperature measurement module is provided in the accommodating cavity. The temperature measurement module includes a temperature sensor and a wiring socket. The temperature sensor is disposed on the conductive connection member. The temperature sensor is electrically connected to the wiring socket. The insulating housing is further provided with a third connection port, which is in communication with the accommodating cavity. The wiring socket is disposed close to the third connection port, and the third connection port allows the wiring plug to extend into the accommodating cavity so as to be plugged into the wiring socket. The fourth locking structure is provided on the outer surface of the insulating housing, and the fourth locking structure is configured to secure a relative position between the wiring plug and the wiring socket after the wiring plug is plugged into the wiring socket through the third connection port. In this way, the relative position between the wiring plug and the wiring socket can be secured by the fourth locking structure to prevent the wiring plug from falling out of the wiring socket. 
     Optionally, a boss is provided around a side wall of the wiring plug. During the plugging of the wiring plug into the wiring socket through the third connection port, the boss extends into the third connection port along with the wiring plug. The fourth locking structure includes a slide rail, a third slider, a stopper, a first elastic buckle, and a first elastic slot. The slide rail is provided on the outer surface of the insulating housing, and the slide rail extends toward the third connection port. The third slider is slidably connected to the slide rail. The stopper is provided at one end of the third slider close to the third connection port. The third slider can slide from a sixth position to a seventh position along the slide rail in the direction toward the third connection port, so as to drive the stopper to move from a position not covering the third connection port to a position covering the third connection port. One of the first elastic buckle and the first elastic slot is provided on the slide rail, and the other of the first elastic buckle and the first elastic slot is provided on the third slider. When the third slider slides to the seventh position, the first elastic buckle is snapped into the first elastic slot. Therefore, the boss can be stopped by the stopper to lock the wiring plug and prevent the wiring plug from falling out of the wiring socket. This structure is simple and easy to implement. 
     Optionally, the slide rail includes a first slide rail section and a second slide rail section, and the second slide rail section is located on the side of the first slide rail section away from the third connection port. When the third slider is in the sixth position, the third slider is located on the second slide rail section and is not located on the first slide rail section. When the third slider is in the seventh position, the third slider is located on the first slide rail section and is not located on the second slide rail section. The first slide rail section is provided with a third sign, and the second slide rail section is provided with a fourth sign. The third sign is different from the fourth sign. Therefore, it can be determined from the third sign and the fourth sign that the wiring plug is in the unlocked state or the locked state. 
     Optionally, a first claw and a second claw are provided on a surface of the bottom arm portion away from the second mounting slot, and the first claw and the second claw constitute two opposite side walls of the first mounting slot. The second claw is fixed relative to the bottom arm portion, and the first claw can move from an eighth position to a ninth position in the direction toward the second claw, to drive the first claw and the second claw to be snapped onto the mounting rail in the power distribution equipment. The base further includes a fifth locking structure. The fifth locking structure is provided between the first claw and the bottom arm portion. The fifth locking structure is configured to secure a relative position between the first claw between the bottom arm portion when the first claw moves to the ninth position. In this way, after the first claw and the second claw are slidably snapped onto the mounting rail in the power distribution equipment, the insulating housing can be prevented from falling off the mounting rail due to displacement of the first claw. 
     Optionally, the fifth locking structure includes a second elastic buckle and a second elastic slot. One of the second elastic buckle and the second elastic slot is provided on the first claw, and the other of the second elastic buckle and the second elastic slot is provided on the bottom arm portion. When the first claw moves to the ninth position, the second elastic buckle is snapped into the second elastic slot. When an acting force applied to the first claw can overcome an elastic snapping force between the second elastic buckle and the second elastic slot, the first claw can be driven to return to the eighth position. This structure is simple and easy to implement. 
     Optionally, a lifting slot is provided on a surface of the first claw facing the bottom arm portion. An operation hole is provided at a position on the bottom arm portion corresponding to the lifting slot. The operation hole extends through the bottom arm portion along the second direction. The operation hole allows the lifting lever to extend into the lifting slot to drive the first claw to move to the eighth position or the ninth position. In this way, the operator can drive the first claw to move to the eighth position or the ninth position from the front side of the base. This operation is convenient and easy to implement. 
     According to a second aspect, some embodiments of this application provide a circuit breaker with a base. The circuit breaker with a base includes a circuit breaker and a base. The base is the base described in any one of the foregoing technical solutions, and the circuit breaker is detachably connected to the first surface of the insulating housing of the base. 
     Because the base used in the circuit breaker with a base in the embodiments of this application is the same as the base described in any one of the foregoing technical solutions, they can resolve the same technical problem and achieve the same desired effect. 
     According to a third aspect, some embodiments of this application provide power distribution equipment. The power distribution equipment includes a mounting rail and a plurality of circuit breakers with bases. The circuit breaker with a base is the circuit breaker with a base described in the foregoing technical solution, and the base of the circuit breaker with a base can be slidably snapped onto the mounting rail by means of the first mounting slot. 
     Because the circuit breaker with a base used in the power distribution equipment in the embodiments of this application is the same as the circuit breaker with a base described in the foregoing technical solution, they can resolve the same technical problem and achieve the same desired effect. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG.  1    is a schematic diagram of a structure of power distribution equipment according to some embodiments of this application; 
         FIG.  2    is a schematic diagram of a structure of a circuit breaker with a base according to some embodiments of this application; 
         FIG.  3    is a schematic diagram of a structure of a plurality of circuit breakers with bases shown in  FIG.  2    being mounted on a mounting rail; 
         FIG.  4    is a schematic diagram of a structure of a circuit breaker with a base according to some other embodiments of this application; 
         FIG.  5    is a schematic diagram of a structure of a base in a first orientation according to some embodiments of this application; 
         FIG.  6    is a schematic diagram of a structure of a plurality of bases shown in  FIG.  5    being mounted on a mounting rail, with two adjacent bases spaced apart for a specific distance; 
         FIG.  7    is a schematic diagram of a structure of the base shown in  FIG.  5    in a second orientation; 
         FIG.  8    is a schematic diagram of a structure of a circuit breaker in the circuit breaker with a base according to some embodiments of this application; 
         FIG.  9    is an exploded view of the circuit breaker in the circuit breaker with a base shown in  FIG.  8   ; 
         FIG.  10    is a schematic diagram of a structure of the circuit breaker shown in  FIG.  8    being mounted onto a first surface of the base; 
         FIG.  11    is a schematic diagram of a structure of a conductive connection member in the base shown in  FIG.  5   ; 
         FIG.  12    is a schematic diagram of a structure of a connection between the conductive connection member in the base shown in  FIG.  5    and a U-shaped securing sleeve; 
         FIG.  13    is a schematic diagram of a structure of the base shown in  FIG.  5    in a third orientation, with a baffle plate removed; 
         FIG.  14    is a schematic diagram of a structure of a second surface of the base shown in  FIG.  13   ; 
         FIG.  15    is a perspective view of a push rod in the base shown in  FIG.  14   ; 
         FIG.  16    is a schematic diagram of a structure of an inner surface of a slide hole in the base shown in  FIG.  14   ; 
         FIG.  17    is a schematic diagram of a structure of a cover plate in the base shown in  FIG.  5    in a second position; 
         FIG.  18    is a schematic diagram of a structure of the cover plate in the base shown in  FIG.  5    in a third position; 
         FIG.  19    is a schematic diagram of a structure of a connection between the cover plate in the base shown in  FIG.  5    and a side arm portion; 
         FIG.  20    is an exploded view of the cover plate in the base shown in  FIG.  5   ; 
         FIG.  21    is a schematic diagram of a structure of a second slider of the cover plate in the base shown in  FIG.  5    in a fourth position; 
         FIG.  22    is a schematic diagram of a structure of the second slider of the cover plate in the base shown in  FIG.  5    in a fifth position; 
         FIG.  23    is an assembly diagram of the conductive connection member, the U-shaped securing sleeve, and a temperature measurement module in the base shown in  FIG.  5   ; 
         FIG.  24   a    is a schematic diagram of a structure of the base shown in  FIG.  5    in a fourth orientation; 
         FIG.  24   b    is a schematic diagram of a structure of a surface on which a fourth locking structure is located in the base shown in  FIG.  24     a;    
         FIG.  24   c    is a partial enlarged view of a region I in the base shown in  FIG.  24     b;    
         FIG.  25   a    is a schematic diagram of a structure of a third slider of the fourth locking structure in the base shown in  FIG.  24   a    in a seventh position; 
         FIG.  25   b    is a partial enlarged view of a region II in the base shown in  FIG.  25     a;    
         FIG.  26    is a schematic diagram of a structure of the base shown in  FIG.  5    in a fifth orientation; 
         FIG.  27    is a perspective view of a first claw in the base shown in  FIG.  26   ; and 
         FIG.  28    is a schematic diagram of a structure of the base shown in  FIG.  5    in a sixth orientation. 
     
    
    
     DESCRIPTION OF EMBODIMENTS 
     The following describes the technical solutions in embodiments of this application with reference to the accompanying drawings in embodiments of this application. It is clear that the described embodiments are merely a part rather than all of embodiments of this application. 
     The terms “first”, “second”, “third”, “fourth”, “fifth”, “sixth”, “seventh”, and “eighth” in the embodiments of this application are merely used for descriptive purposes, and should not be construed as indicating or implying the relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with “first”, “second”, “third”, “fourth”, “fifth”, “sixth”, “seventh”, and “eighth” may explicitly or implicitly include one or more features. 
     In descriptions of embodiments of this application, the term “and/or” describes an association relationship between associated objects and indicates that three relationships may exist. For example, A and/or B may indicate the following three cases: Only A exists, both A and B exist, and only B exists. In addition, the character “/” in this specification generally indicates an “or” relationship between the associated objects. 
     This application relates to a base, a circuit breaker with a base, and power distribution equipment. The concepts involved in this application are briefly described below. 
     Miniature circuit breaker (MCB): one of the most widely used terminal protection electrical devices in building electrical terminal power distribution equipment. The miniature circuit breaker is used for single-phase or three-phase short-circuit, overload, overvoltage, and other protection with a current below 125 A. A miniature circuit breaker is of four types, namely, single-pole (1P), two-pole (2P), three-pole (3P), and four-pole (4P). 
     Copper bar: also referred to as a copper busbar or a copper bus bar, which is an elongated conductor made of copper material and having a rectangular cross-section or a rectangular cross-section with chamfered or rounded corners. To avoid point discharge, a copper bar having a rectangular cross-section with rounded corners is usually used. The copper bar plays the role of transmitting a current and connecting electrical equipment in a circuit. 
     Negative temperature coefficient (NTC) thermistor: a thermistor with a resistance value decreasing rapidly as temperature increases. The NTC thermistor is manufactured by ceramic technology using oxides of metals such as manganese, cobalt, nickel, and copper as main materials. 
     A base of a circuit breaker typically includes an enclosed insulating housing and a conductive connection member. The circuit breaker is mounted on the insulating housing. The conductive connection member is provided in the insulating housing. One end of the conductive connection member is electrically connected to a terminal of the circuit breaker, and the other end of the conductive connection member is electrically connected to a cable terminal, with the cable terminal connected to a cable, so as to connect the circuit breaker to the cable. When bases of a plurality of circuit breakers are connected in series on a rail in power distribution equipment, two adjacent bases are next to each other, and conductive connection members of the two adjacent bases are separated by insulating housings of the two adjacent bases. However, in fact, the insulation isolation between the conductive connection members of the two adjacent bases can be achieved simply by separating the conductive connection members of the two bases by the insulating housing of one base. Therefore, material used for the insulating housing of the base is redundant, resulting in a waste of resources. 
     To avoid the above problem, this application provides power distribution equipment, which includes, but is not limited to, a high-voltage power distribution cabinet, a low-voltage switch cabinet, a switch box, a control box, and the like. 
       FIG.  1    is a schematic diagram of a structure of power distribution equipment according to some embodiments of this application. As shown in  FIG.  1   , the power distribution equipment includes a circuit breaker accommodating cavity  1 , and the circuit breaker accommodating cavity  1  is provided with a mounting rail  2  and a plurality of circuit breakers  3  with bases. The plurality of circuit breakers  3  with bases are slidably snapped onto the mounting rail  2  by means of the bases  32 , respectively, to connect the plurality of circuit breakers  3  with bases in series as a row by means of the mounting rail  2 , thereby facilitating the management of the circuit breakers. One end of the accommodating cavity  1  is open, and the opening of the accommodating cavity  1  is provided with a cover  4 . The cover  4  is used for the opening or closing of the accommodating cavity  1 , so as to facilitate an operator to open, close, and maintain the circuit breakers. 
     This application further provides a circuit breaker with a base, which is the circuit breaker with a base in the above-mentioned power distribution equipment. The circuit breaker with a base includes a circuit breaker and a base. Optionally, the circuit breaker is a miniature circuit breaker. The circuit breaker may be a single-pole circuit breaker, a two-pole circuit breaker, a three-pole circuit breaker, or a four-pole circuit breaker, which is not specifically limited herein. The circuit breaker is mounted on the base. The base is mounted on the mounting rail in the power distribution equipment, and can slide along the mounting rail to adjust the position of the circuit breaker with a base. 
     The number of bases in the circuit breaker with a base may be one, two, three, or four, which is not specifically limited herein. The circuit breaker may be a single-pole circuit breaker, a two-pole circuit breaker, a three-pole circuit breaker, or a four-pole circuit breaker. A width of the two-pole circuit breaker in an extension direction of the mounting rail is usually twice that of the single-pole circuit breaker in the extension direction of the mounting rail. A width of the three-pole circuit breaker in the extension direction of the mounting rail is usually three times that of the single-pole circuit breaker in the extension direction of the mounting rail. A width of the four-pole circuit breaker in the extension direction of the mounting rail is usually four times that of the single-pole circuit breaker in the extension direction of the mounting rail. Therefore, to improve the adaptability of the base, the base may be a base that matches the single-pole circuit breaker. In this way, if the circuit breaker is a two-pole circuit breaker, two bases arranged side by side may be used to mount the two-pole circuit breaker; if the circuit breaker is a three-pole circuit breaker, three bases arranged side by side may be used to mount the three-pole circuit breaker; and if the circuit breaker is a four-pole circuit breaker, four bases arranged side by side may be used to mount the four-pole circuit breaker. 
       FIG.  2    is a schematic diagram of a structure of a circuit breaker with a base according to some embodiments of this application. As shown in  FIG.  2   , the circuit breaker with a base includes a circuit breaker  31  and a base  32 . The circuit breaker  31  is a single-pole miniature circuit breaker. The base  32  is adapted to a single-pole circuit breaker. The circuit breaker  31  is mounted on the base  32 . The base  32  is mounted on the mounting rail in the power distribution equipment.  FIG.  3    is a schematic diagram of a structure of a plurality of circuit breakers with bases shown in  FIG.  2    being mounted on a mounting rail. As shown in  FIG.  3   , the plurality of circuit breakers  3  with bases can slide along the mounting rail  2  to adjust the positions of the plurality of circuit breakers  3  with bases. 
       FIG.  4    is a schematic diagram of a structure of a circuit breaker with a base according to some other embodiments of this application. As shown in  FIG.  4   , the circuit breaker with a base includes a circuit breaker  31  and a base  32 . The circuit breaker  31  is a two-pole miniature circuit breaker, and there are two bases  32 , each of which is adapted to a single-pole circuit breaker. The two bases  32  are arranged side by side, and the circuit breaker  31  is mounted on the two bases  32  arranged side by side. The two bases  32  are mounted on the mounting rail  2  in the power distribution equipment, and can slide along the mounting rail  2  to adjust the position of the circuit breaker  3  with a base. 
     This application further provides a base, which is the base in the above-mentioned circuit breaker with a base.  FIG.  5    is a schematic diagram of a structure of a base in a first orientation according to some embodiments of this application. The base is the base  32  in the circuit breaker with a base shown in  FIG.  2    or  FIG.  4   . 
     As shown in  FIG.  5   , the base  32  includes an insulating housing  321 . The insulating housing  321  is made of an insulating material such as plastic or ceramic. 
     The insulating housing  321  has a first surface  100  and a second surface  200  that are away from each other. The first surface  100  may be a flat surface or a curved surface. The first surface  100  is configured for a detachable connection of the circuit breaker  31 . The second surface  200  may be a flat surface or a curved surface. The second surface  200  is provided with a first mounting slot  300 . The insulating housing  321  can be slidably snapped onto the mounting rail  2  in the power distribution equipment by means of the first mounting slot  300 . 
     As shown in  FIG.  5   , an accommodating cavity  400  is formed in the insulating housing  321 , and the accommodating cavity  400  is configured to accommodate a conductive connection member  322 . One end of the accommodating cavity  400  is open along a sliding direction of the insulating housing  321  relative to the mounting rail  2  (that is, a direction X shown in  FIG.  5   ), and the other end thereof is closed by a first wall plate  321   c  of the insulating housing  321 . 
     In this way, when a plurality of bases  32  are mounted on the mounting rail  2 , FIG.  6  is a schematic diagram of a structure of a plurality of bases shown in  FIG.  5    being mounted on a mounting rail, with two adjacent bases spaced apart for a specific distance. In actual use, the plurality of bases are attached together in sequence. As shown in  FIG.  6   , accommodating cavities  400  of the plurality of bases  32  are open toward the same direction, and in every two adjacent bases  32 , a first wall plate  321   c  of one base  32  covers the opening of the accommodating cavity  400  of the other base  32 , thereby achieving the insulation isolation between conductive connection members  322  of the two adjacent bases  32 . Therefore, the insulating housing  321  of the base  32  does not need to be designed as an enclosed housing, and the material costs of the insulating housing  321  as well as the costs of the base  32  are relatively low. For power distribution equipment provided with a large number of bases, the costs can be significantly reduced. 
     In the foregoing embodiment, to protect a conductive connection member  322  in the base  32  at the end, as shown in  FIG.  6   , a cover plate  500  is provided at the opening of an accommodating cavity  400  of the base  32  at the end. The cover plate  500  can cover the opening of the accommodating cavity  400  of the base  32  at the end. 
     The first surface  100  may be detachably connected to the circuit breaker  31  by means of snap-fit, threaded connection, magnetic attraction, or the like, which is not specifically limited herein. 
     In some embodiments, as shown in  FIG.  5   , the insulating housing  321  includes a bottom arm portion  3211  and two side arm portions  3212 . One end of each of the two side arm portions  3212  is connected to either end of the bottom arm portion  3211  along a first direction (that is, a direction Y shown in  FIG.  5   ), and the other end of each of the two side arm portions  3212  extends toward the same side of the bottom arm portion  3211  along a second direction (that is, a direction Z shown in  FIG.  5   ). 
     As shown in  FIG.  5   , the bottom arm portion  3211  and the two side arm portions  3212  enclose a second mounting slot  600 , and the second mounting slot  600  is configured for snap-fitting of the circuit breaker  31 . The inner surface of the second mounting slot  600  and the surfaces of the side arm portions  3212  away from the bottom arm portion  3211  constitute the first surface  100 , and the surface of the bottom arm portion  3211  away from the second mounting slot  600  constitutes the second surface  200 . 
     The sliding direction of the insulating housing  321  relative to the mounting rail  2 , the first direction, and the second direction are perpendicular to each other. 
     In this way, the circuit breaker  31  can be detachably snapped into the second mounting slot  600  through the opening at one end of the second mounting slot  600  away from the bottom arm portion  3211 . The snapping operation of the circuit breaker  31  is simple, and the assembly and disassembly efficiency are relatively high. 
     The base  32  is configured to achieve an electrical connection between the circuit breaker  31  and a cable. To achieve this purpose, as shown in  FIG.  5   , the base  32  further includes the conductive connection member  322 . The conductive connection member  322  is provided in the accommodating cavity  400 , and the conductive connection member  322  is configured to conductively connect a terminal of the circuit breaker  31  and a cable terminal. 
     Specifically, as shown in  FIG.  5   , the insulating housing  321  is provided with a first connection port  321   a .  FIG.  7    is a schematic diagram of a structure of the base shown in  FIG.  5    in a second orientation. As shown in  FIG.  7   , the insulating housing  321  is further provided with a second connection port  321   b . Both the first connection port  321   a  and the second connection port  321   b  are in communication with the accommodating cavity  400 . The first connection port  321   a  is configured to allow the terminal of the circuit breaker  31  to extend into the accommodating cavity  400  when the circuit breaker  31  is connected to the first surface  100 . The second connection port  321   b  allows the cable terminal to extend into the accommodating cavity  400 . 
     The conductive connection member  322  includes a first conductive connection portion  3221  and a second conductive connection portion  3222  that are electrically connected. Both the first conductive connection portion  3221  and the second conductive connection portion  3222  are made of copper or copper alloy. The first conductive connection portion  3221  is disposed close to the first connection port  321   a , and the first conductive connection portion  3221  is configured to be electrically connected to the terminal of the circuit breaker  31 . The second conductive connection portion  3222  is disposed close to the second connection port  321   b , and the second conductive connection portion  3222  is configured to be electrically connected to the cable terminal, which is connected to the cable. 
     The electrical connection between the first conductive connection portion  3221  and the terminal of the circuit breaker  31  may be a plug-in electrical connection, an abutting electrical connection, or the like, which is not specifically limited herein. 
       FIG.  8    is a schematic diagram of a structure of a circuit breaker in the circuit breaker with a base according to some embodiments of this application. The circuit breaker is the circuit breaker  31  in the circuit breaker with a base shown in  FIG.  2    or  FIG.  4   . As shown in  FIG.  8   , the circuit breaker  31  includes a circuit breaker body  311  and a terminal  312 . The terminal  312  is an adapting terminal connected to a terminal block of the circuit breaker body  311 . The terminal  312  may be a copper bar or another metal conductor structure. In some embodiments, as shown in  FIG.  8   , the terminal  312  is a copper bar. 
     Specifically,  FIG.  9    is an exploded view of the circuit breaker in the circuit breaker with a base shown in  FIG.  8   . As shown in  FIG.  9   , a wiring hole  311   a  is provided in a side wall of the circuit breaker body  311 , and the terminal block (not shown in the figure) is provided in the wiring hole  311   a . The terminal  312  includes a fixing portion  312   a  and a plug portion  312   b  fixed onto the fixing portion  312   a . The fixing portion  312   a  extends into the wiring hole  311   a  and is electrically connected to the terminal block. The plug portion  312   b  protrudes from the side wall of the circuit breaker body  311 .  FIG.  10    is a schematic diagram of a structure of the circuit breaker shown in  FIG.  8    being mounted onto a first surface of the base. As shown in  FIG.  10   , when the circuit breaker is connected to the first surface  100 , the terminal  312  is plugged into the first conductive connection portion  3221  by means of the plug portion  312   b , to achieve the electrical connection between the terminal  312  and the first conductive connection portion  3221 . 
     In some other embodiments, if the terminal block of the circuit breaker body  311  protrudes from the surface of the circuit breaker body  311 , the terminal  312  may alternatively be the terminal block of the circuit breaker body  311 , which is not specifically limited herein. 
     There are two terminals  312 , which are a positive terminal and a negative terminal, respectively. Correspondingly, as shown in  FIG.  5   , the base  32  also includes two conductive connection members  322 , which are configured to achieve an electrical connection between the positive terminal and an anode cable, and between the negative terminal and a cathode cable, respectively. 
     As shown in  FIG.  5   , the first conductive connection portion  3221  is a U-shaped conductive elastic sheet, and a slot  700  is formed between two elastic arms of the U-shaped conductive elastic sheet. The slot  700  is configured for the plugging of the terminal  312  of the circuit breaker when the circuit breaker is connected to the first surface  100 . 
     In this way, the electrical connection between the first conductive connection portion  3221  and the terminal  312  of the circuit breaker  31  is achieved by means of plugging, providing better stability of the electrical connection. 
     In some embodiments, the edge of one end of each of the elastic arms of the U-shaped conductive elastic sheet that surround the opening of the slot  700  is provided with at least one notch, which extends toward a bottom wall of the slot  700  to partition the elastic arm into a plurality of elastic arm units. The elastic arm unit includes an abutting portion, which is a portion that touches the terminal  312  of the circuit breaker  31  when the terminal  312  of the circuit breaker  31  is plugged into the slot  700 . Distances between abutting portions of the plurality of elastic arm units and the bottom wall of the slot  700  in the depth direction of the slot  700  are different. 
     For example,  FIG.  11    is a schematic diagram of a structure of a conductive connection member in the base shown in  FIG.  5   . As shown in  FIG.  11   , in the two elastic arms of the U-shaped conductive elastic sheet, the edge of one end of each elastic arm that surrounds the opening of the slot  700  is provided with two notches a, which extend toward the bottom wall of the slot  700  to partition the elastic arm into three elastic arm units  3221   a . Each of the three elastic arm units  3221   a  includes an abutting portion b. A distance between an abutting portion b of the middle one of the three elastic arm units  3221   a  and the bottom wall of the slot  700  in the depth direction of the slot  700  is a first distance, and distances between abutting portions b of the two side ones of the three elastic arm units  3221   a  and the bottom wall of the slot  700  in the depth direction of the slot  700  are equal and both are a second distance, where the first distance is greater than the second distance. 
     In this way, the elastic arm is split into a plurality of elastic arm units  3221   a  having independent abutting portions b, and time of contact between the abutting portions b of the plurality of elastic arm units  3221   a  and the terminal  312  of the circuit breaker  31  during the plugging of the circuit breaker  31  is different. During the plugging of the circuit breaker  31  when the base  32  is powered on (that is, the hot-plugging process), an electric arc is generated on an elastic arm unit  3221   a  that is first touched, thereby sacrificing electrical performance of the elastic arm unit  3221   a . Therefore, the terminal  312  of the circuit breaker  31  can be effectively electrically connected to the remaining elastic arm units  3221   a  after being plugged into the slot  700 . In this way, the elastic arms of the U-shaped conductive elastic sheet are prevented from being completely sacrificed due to the electric arc during the plugging of the terminal  312 . 
     In order to secure relative positions of the plurality of elastic arm units  3221   a , in some embodiments,  FIG.  12    is a schematic diagram of a structure of a connection between the conductive connection member in the base shown in  FIG.  5    and a U-shaped securing sleeve. As shown in  FIG.  12   , the base  32  further includes a U-shaped securing sleeve  323 . The U-shaped securing sleeve  323  is made of plastic or metal, and the U-shaped securing sleeve  323  has elasticity. The U-shaped securing sleeve  323  covers the U-shaped conductive elastic sheet to secure the relative positions of the plurality of elastic arm units  3221   a  of the U-shaped conductive elastic sheet, and increase an elastic clamping force between the two elastic arms of the U-shaped conductive elastic sheet, so that the U-shaped conductive elastic sheet can be in effective contact with and electrically connected to the terminal  312  of the circuit breaker  31 . 
     The electrical connection between the second conductive connection portion  3222  and the cable terminal may be a plug-in electrical connection, a crimping electrical connection, or the like, which is not specifically limited herein. 
     In some embodiments,  FIG.  13    is a schematic diagram of a structure of the base shown in  FIG.  5    in a third orientation, with a baffle plate  800  removed. As shown in  FIG.  13   , a cable terminal plug-in slot  401  is provided at a position close to the second connection port  321   b  in the accommodating cavity  400 , and the opening of the cable terminal plug-in slot  401  is opposite the second connection port  321   b . The second conductive connection portion  3222  constitutes one side wall of the cable terminal plug-in slot  401 . After the cable terminal is plugged into the cable terminal plug-in slot  401  through the second connection port  321   b , the cable terminal can be in contact with and electrically connected to the second conductive connection portion  3222 . 
     As shown in  FIG.  13   , the base  32  further includes an elastic member  324 . The elastic member  324  constitutes the other side wall of the cable terminal plug-in slot  401  opposite the second conductive connection portion  3222 . The elastic member  324  is configured to apply an elastic pressing force toward the second conductive connection portion  3222  to the cable terminal when the cable terminal is plugged into the cable terminal plug-in slot  401  through the second connection port  321   b , so as to crimp the cable terminal onto the second conductive connection portion  3222 . 
     In this way, the secured relative position of and the electrical connection to the second conductive connection portion  3222  can be achieved immediately when the cable terminal is plugged into the cable terminal plug-in slot  401 . This connection method is convenient to operate and has high efficiency. In addition, the design of the elastic force of the elastic member  324  can ensure the stability of the connection between the cable terminal and the second conductive connection portion  3222 , preventing the cable terminal from falling off. 
     As shown in  FIG.  5   , the base  32  further includes a baffle plate  800 . The baffle plate  800  and the first wall plate  321   c  constitute the other two side walls of the cable terminal plug-in slot  401 , thereby defining the plugging position of the cable terminal. 
     The elastic member  324  includes, but is not limited to, a spring, an elastic sheet, and rubber.  FIG.  13    shows merely an example in which the elastic member  324  is an elastic sheet, which should not be considered as limiting this application. When the elastic member  324  is an elastic sheet, specifically, as shown in  FIG.  13   , the elastic sheet includes a fixed portion  3241  and an elastic arm portion  3242 . The fixed portion  3241  is fixed relative to the insulating housing  321 . One end of the elastic arm portion  3242  is connected to the fixed portion  3241 , and the other end of the elastic arm portion  3242  extends toward the second conductive connection portion  3222  and inclines toward the direction away from the second connection port  321   b . The elastic arm portion  3242  constitutes the other side wall of the cable terminal plug-in slot  401  opposite the second conductive connection portion  3222 . 
     In this way, during the plugging of the cable terminal into the cable terminal plug-in slot  401  through the second connection port  321   b , the head of the cable terminal presses the elastic arm portion  3242 , so that the elastic arm portion  3242  is bent and deformed to accumulate an elastic force, which is directed to the second conductive connection portion  3222 . When the bending deformation produced by the elastic arm portion  3242  reaches a specific level, the accumulated elastic force can crimp the cable terminal onto the second conductive connection portion  3222 , so as to achieve the secured relative position and the electrical connection between the cable terminal and the second conductive connection portion  3222 . This structure is simple and easy to implement. 
     When an error occurs during the installation of the cable and the base  32  or in the later maintenance process of the base  32 , the cable needs to be removed from the base  32 . For ease of the removal of the cable, in some embodiments, as shown in  FIG.  13   , the base  32  further includes an unlocking device  325 . The unlocking device  325  is configured to drive the elastic arm portion  3242  to move away from the second conductive connection portion  3222 , so as to release the elastic pressing force applied to the cable terminal. 
     In this way, when an error occurs during the installation of the cable and the base  32  or in the later maintenance process of the base  32 , the elastic arm portion  3242  may be driven by the unlocking device  325  to move away from the second conductive connection portion  3222 , so as to release the elastic pressing force applied to the cable terminal, and the cable terminal is unplugged from the cable terminal plug-in slot  401  to implement the removal of the cable terminal from the base  32 . 
     The unlocking device  325  has a plurality of structural forms, which is not specifically limited herein. 
     For example, the unlocking device  325  may be a pull cord connected to the elastic arm portion  3242 , and the elastic arm portion  3242  can be pulled with the pull cord to move away from the second conductive connection portion  3222 . 
     For another example, as shown in  FIG.  14   , the unlocking device  325  includes a push rod  3251 . The elastic sheet further includes a connection portion  3243 , and one end of the elastic arm portion  3242  is connected to the fixed portion  3241  by means of the connection portion  3243 .  FIG.  14    is a schematic diagram of a structure of a second surface of the base shown in  FIG.  13   . As shown in  FIG.  14   , a slide hole  321   d  is provided at a position opposite the connection portion  3243  (refer to  FIG.  13   ) on the wall plate of the insulating housing  321  in which the second connection port  321   b  is located. The push rod  3251  slides through the slide hole  321   d , and can slide to a first position (not shown in the figure) in the direction toward the connection portion  3243 , to press the connection portion  3243  to bend in the direction away from the slide hole  321   d  and drive the elastic arm portion  3242  to move away from the second conductive connection portion  3222 , so as to release the elastic pressing force applied to the cable terminal. This structure of the unlocking device  325  is simple and easy to implement. 
     In the foregoing embodiment, the unlocking device  325  further includes a first locking structure  3252 . The first locking structure  3252  is configured to secure a relative position between the push rod  3251  and the slide hole  321   d  in the axial direction of the slide hole  321   d  after the push rod  3251  slides to the first position. 
     In this way, the push rod  3251  can be kept at the first position by the first locking structure  3252 , so that the elastic arm portion  3242  is kept at a position where the elastic pressing force applied to the cable terminal is released. Therefore, the operator does not need to manually hold the push rod  3251 , and the operator can unplug the cable terminal from the cable terminal plug-in slot  401  with one hand. The operation of removing the cable is convenient. 
     The first locking structure  3252  has a plurality of structural forms, which is not specifically limited herein. 
     For example, the first locking structure  3252  includes an elastic buckle and an elastic slot. One of the elastic buckle and the elastic slot is provided on the push rod  3251 , and the other of the elastic buckle and the elastic slot is provided on the wall plate of the insulating housing  321  in which the slide hole  321   d  is located. When the push rod  3251  slides to the first position through the slide hole  321   d , the elastic buckle is snapped into the elastic slot to secure the relative position between the push rod  3251  and the slide hole  321   d  in the axial direction of the slide hole  321   d . This structure is simple and easy to implement. 
     For another example,  FIG.  15    is a perspective view of a push rod in the base shown in  FIG.  14   . As shown in  FIG.  15   , the first locking structure  3252  includes a first slider  3252   a , which is provided on a side wall of the push rod  3251 .  FIG.  16    is a schematic diagram of a structure of an inner surface of a slide hole in the base shown in  FIG.  14   . As shown in  FIG.  16   , the first locking structure  3252  further includes a first slide groove  3252   b , which is provided on an inner wall of the slide hole  321   d . The first slide groove  3252   b  includes a first slide groove section  3252   b   1  and a second slide groove section  3252   b   2 . The first slide groove section  3252   b   1  extends along the axial direction of the slide hole  321   d , the second slide groove section  3252   b   2  extends along the circumferential direction of the slide hole  321   d , and one end of the second slide groove section  3252   b   2  is connected to one end of the first slide groove section  3252   b   1  close to the connection portion  3243 . The first slider  3252   a  is slidably connected in the first slide groove  3252   b , and the first slider  3252   a  slides in the first slide groove section  3252   b   1  during the sliding of the push rod  3251  to the first position. When the push rod  3251  slides to the first position, the first slider  3252   a  slides to the end of the first slide groove section  3252   b   1  close to the connection portion  3243 . After the push rod  3251  slides to the first position, the first slider  3252   a  can slide from the first slide groove section  3252   b   1  into the second slide groove section  3252   b   2 . 
     In this way, after the push rod  3251  slides to the first position, the push rod  3251  may be rotated, and the first slider  3252   a  may be driven to slide from the first slide groove section  3252   b   1  into the second slide groove section  3252   b   2 , thereby securing the relative position between the push rod  3251  and the slide hole  321   d  in the axial direction of the slide hole  321   d  and keeping the push rod  3251  in the first position. This structure is simple and easy to implement. 
     It can be known that, in the foregoing embodiment, the positions of the first slider  3252   a  and the first slide groove  3252   b  may alternatively be provided as follows: The first slider  3252   a  is provided on the inner wall of the slide hole  321   d , and the first slide groove  3252   b  is provided on the side wall of the push rod  3251 . In this way, the effect achieved is the same as the effect achieved by the foregoing embodiment, which is not repeated herein. 
     To prevent the push rod  3251  from falling out of the insulating housing  321  through the slide hole  321   d , in some embodiments, as shown in  FIG.  15   , one end of the push rod  3251  close to the connection portion  3243  is inside the insulating housing  321 , and a first stopper protrusion  3253  is provided on a side wall of the end of the push rod  3251  close to the connection portion  3243 . The first stopper protrusion  3253  is configured to prevent the push rod  3251  from falling out of the insulating housing  321  through the slide hole  321   d.    
     To prevent the push rod  3251  from falling into the inner space of the insulating housing  321  through the slide hole  321   d , in some embodiments, as shown in  FIG.  15   , one end of the push rod  3251  away from the connection portion  3243  is outside the insulating housing  321 , and a second stopper protrusion  3254  is provided on a side wall of the end of the push rod  3251  away from the connection portion  3243 . The second stopper protrusion  3254  is spaced from the insulating housing  321 . When the push rod  3251  slides to the first position in the direction toward the connection portion  3243 , the second stopper protrusion  3254  abuts against an outer surface of the insulating housing  321 . 
     In this way, the second stopper protrusion  3254  can prevent the push rod  3251  from falling into the inner space of the insulating housing  321  through the slide hole  321   d . This structure is simple and easy to implement. 
     In some embodiments, as shown in  FIG.  5   , the base  32  further includes a cover plate  326 . One end of the cover plate  326  is rotatably connected to the end of the side arm portion  3212  away from the bottom arm portion  3211 . An axis of rotation of the cover plate  326  is parallel to the sliding direction of the insulating housing  321  relative to the mounting rail (that is, the direction X in  FIG.  5   ). The cover plate  326  can be rotated from a second position to a third position in the direction toward the second mounting slot  600 .  FIG.  17    is a schematic diagram of a structure of a cover plate in the base shown in  FIG.  5    in a second position. As shown in  FIG.  17   , when the cover plate  326  is in the second position, the cover plate  326  does not cover the opening of the second mounting slot  600 . At this time, the circuit breaker  31  can be snapped into the second mounting slot  600 , or can be unplugged out of the second mounting slot  600 .  FIG.  18    is a schematic diagram of a structure of the cover plate in the base shown in  FIG.  5    in a third position. As shown in  FIG.  18   , when the cover plate  326  is in the third position, the cover plate  326  covers the opening of the second mounting slot  600 . At this time, the cover plate  326  can prevent the circuit breaker  31  from falling out of the second mounting slot  600 . Therefore, the mounting stability of the circuit breaker  31  on the base  32  can be improved. 
     It should be noted that the opening of the second mounting slot  600  described in the foregoing embodiment is an opening at one end of the second mounting slot  600  away from the bottom arm portion  3211 , and the circuit breaker  31  is snapped into or unplugged out of the second mounting slot  600  through this opening. 
     In some embodiments, the base  32  further includes a second locking structure. The second locking structure is provided between the cover plate  326  and the side arm portion  3212 . The second locking structure is configured to secure a relative position between the cover plate  326  and the side arm portion  3212  when the cover plate  326  is rotated to the third position. In this way, the cover plate  326  can prevent the circuit breaker  31  from falling out of the second mounting slot  600 . 
     The second locking structure has a plurality of structural forms, such as a bolt or a positioning pin, which is not specifically limited herein. 
     In some embodiments,  FIG.  19    is a schematic diagram of a structure of a connection between the cover plate in the base shown in  FIG.  5    and a side arm portion. As shown in FIG.  19 , the second locking structure  327  includes an elastic snapping arm  3271  and a snapping notch  3272 . The elastic snapping arm  3271  is provided on the cover plate  326 , and the elastic snapping arm  3271  extends along the sliding direction of the insulating housing  321  relative to the mounting rail (that is, the direction X shown in  FIG.  19   ). The snapping notch  3272  is provided on the side arm portion  3212 , and the opening of the snapping notch  3272  faces the second mounting slot  600 . When the cover plate  326  is rotated to the third position, the elastic snapping arm  3271  is snapped into the snapping notch  3272 . This structure is simple and easy to implement. In addition, when an acting force applied to the cover plate  326  can overcome an elastic snapping force between the elastic snapping arm  3271  and the snapping notch  3272 , the cover plate  326  can be driven to return to the second position to expose the opening of the second mounting slot  600 . At this time, the circuit breaker  31  can be replaced or mounted. 
     To further prevent the circuit breaker  31  from falling out of the second mounting slot  600 , in some embodiments,  FIG.  20    is an exploded view of the cover plate in the base shown in  FIG.  5   . As shown in  FIG.  20   , the base  32  further includes a third locking structure  328 . The third locking structure  328  is configured to secure a relative position between the elastic snapping arm  3271  and the snapping notch  3272  when the cover plate  326  is rotated to the third position. In this way, the cover plate  326  is double-locked, so that the cover plate  326  can effectively prevent the circuit breaker  31  from falling out of the second mounting slot  600 . 
     In the foregoing embodiment, the third locking structure  328  has a plurality of structural forms, which is not specifically limited herein. 
     In some embodiments, as shown in  FIG.  20   , the third locking structure  328  includes a second slide groove  3281  and a second slider  3282 . The second slide groove  3281  is provided on the cover plate  326 , and the second slide groove  3281  extends along a direction parallel to the cover plate  326  and perpendicular to the axis/of rotation of the cover plate  326 . The second slider  3282  is slidably connected in the second slide groove  3281 , and the second slider  3282  can slide from a fourth position to a fifth position along the second slide groove  3281  in the direction toward the axis/of rotation of the cover plate  326 . 
     The third locking structure  328  further includes a stopper buckle  3283  and a stopper slot  3284 . The stopper buckle  3283  is provided on the second slider  3282 , and the stopper slot  3284  is provided on a bottom surface of the second slide groove  3281 . When the second slider  3282  slides from the fourth position to the fifth position, the second slider  3282  drives the stopper buckle  3283  to be slidably snapped into the stopper slot  3284 , and makes the stopper buckle  3283  abut against a surface of the elastic snapping arm  3271  away from the axis/of rotation of the cover plate  326 . 
     In this way, the elastic snapping arm  3271  can be locked in the snapping notch  3272  to secure the relative position between the elastic snapping arm  3271  and the snapping notch  3272 . This structure is simple and easy to implement. In addition, when an acting force applied to the second slider  3282  can overcome an elastic snapping force between the stopper buckle  3283  and the stopper slot  3284 , the second slider  3282  can be driven to return to the fourth position to unlock the elastic snapping arm  3271 , so that the elastic snapping arm  3271  can slide out of the snapping notch  3272  under the action of an external force. 
     In some embodiments,  FIG.  21    is a schematic diagram of a structure of a second slider of the cover plate in the base shown in  FIG.  5    in a fourth position. As shown in  FIG.  21   , the second slide groove  3281  includes a third slide groove section  3281   a  and a fourth slide groove section  3281   b , and the fourth slide groove section  3281   b  is located on the side of the third slide groove section  3281   a  away from the axis of rotation of the cover plate  326 . When the second slider  3282  is in the fourth position, the second slider  3282  is located in the fourth slide groove section  3281   b , and is not located in the third slide groove section  3281   a .  FIG.  22    is a schematic diagram of a structure of the second slider of the cover plate in the base shown in  FIG.  5    in a fifth position. As shown in  FIG.  22   , when the second slider  3282  is in the fifth position, the second slider  3282  is located in the third slide groove section  3281   a , and is not located in the fourth slide groove section  3281   b . A bottom surface of the third slide groove section  3281   a  is provided with a first sign A, and a bottom surface of the fourth slide groove section  3281   b  is provided with a second sign B. The first sign A is different from the second sign B. 
     In this way, when the second slider  3282  is in the fourth position, the first sign A is revealed, which means that the elastic snapping arm  3271  is in an unlocked state; and when the second slider  3282  is in the fifth position, the second sign B is revealed, which means that the elastic snapping arm  3271  is in a locked state. Therefore, it can be determined from the first sign A and the second sign B that the elastic snapping arm  3271  is in the unlocked state or the locked state. 
     In the foregoing embodiment, the first sign A may be the word “ON”, or may be a green coating area, or may include a green coating area and the word “ON” provided on the green coating area. Certainly, the first sign A may also be another sign, which is not specifically limited herein. 
     Correspondingly, the second sign B may be the word “OFF”, or may be a red coating area, or may include a red coating area and the word “OFF” provided on the red coating area. Certainly, the second sign B may also be another sign, which is not specifically limited herein. 
     To drive the second slider  3282  to slide in the second slide groove  3281 , in some embodiments, as shown in  FIG.  21    or  FIG.  22   , the second slider  3282  is provided with a handle  900 , through which the second slider  3282  can be driven to slide in the second slide groove  3281 . 
     In some embodiments,  FIG.  23    is an assembly diagram of the conductive connection member, the U-shaped securing sleeve, and a temperature measurement module in the base shown in  FIG.  5   . As shown in  FIG.  23   , the base  32  further includes a temperature measurement module  329 . The temperature measurement module  329  includes a temperature sensor  3291  and a wiring socket  3292 . The temperature sensor  3291  includes, but is not limited to, a thermal element such as an NTC thermistor or a thermocouple. A cathode wiring and an anode wiring of the temperature sensor  3291  are both electrically connected to the wiring socket  3292 , and a wiring plug  000  is plugged into the wiring socket  3292 , thereby implementing the wiring of positive and negative terminals of the temperature sensor  3291 . 
     When the temperature measurement module  329  is mounted in the base  32 , as shown in  FIG.  5   , the temperature measurement module  329  is disposed in the accommodating cavity  400 . 
     As shown in  FIG.  23   , the temperature sensor  3291  is disposed on the conductive connection member  322  to measure a temperature of the conductive connection member  322 , thereby preventing the conductive connection member  322  from being deformed or even causing a fire due to overtemperature. 
     Optionally, as shown in  FIG.  11   , a temperature sensor accommodating trough c is formed on the U-shaped conductive elastic sheet of the conductive connection member  322 . As shown in  FIG.  23   , the temperature sensor  3291  is mounted in the temperature sensor accommodating trough c, and a shielding sheet d is provided at the opening of the temperature sensor accommodating trough c. The shielding sheet d is connected to the U-shaped securing sleeve  323 , and the shielding sheet d and the U-shaped securing sleeve  323  are integrally formed. In this way, the temperature sensor  3291  can be prevented from falling out of the conductive connection member  322 . This structure is simple and easy to implement. 
     In addition,  FIG.  24   a    is a schematic diagram of a structure of the base shown in  FIG.  5    in a fourth orientation. As shown in  FIG.  24   a   , the insulating housing  321  is further provided with a third connection port  321   e , which is in communication with the accommodating cavity  400 . The wiring socket  3292  is disposed close to the third connection port  321   e , and the third connection port  321   e  allows the wiring plug  000  to extend into the accommodating cavity  400  so as to be plugged into the wiring socket  3292 . 
     As shown in  FIG.  5    and  FIG.  24   a   , the base  32  further includes a fourth locking structure  330 . The fourth locking structure  330  is provided on the outer surface of the insulating housing  321 , and the fourth locking structure  330  is configured to secure a relative position between the wiring plug  000  and the wiring socket  3292  after the wiring plug  000  is plugged into the wiring socket  3292  through the third connection port  321   e.    
     In this way, the relative position between the wiring plug  000  and the wiring socket  3292  can be secured by the fourth locking structure  330  to prevent the wiring plug  000  from falling out of the wiring socket  3292 . 
     The fourth locking structure  330  has a plurality of structural forms, which is not specifically limited herein. 
     In some embodiments, as shown in  FIG.  23   , a boss  001  is provided around a side wall of the wiring plug  000 . During the plugging of the wiring plug  000  into the wiring socket  3292  through the third connection port  321   e , the boss  001  extends into the third connection port  321   e  along with the wiring plug  000 . 
       FIG.  24   b    is a schematic diagram of a structure of a surface on which a fourth locking structure is located in the base shown in  FIG.  24   a   .  FIG.  24   c    is a partial enlarged view of a region I in the base shown in  FIG.  24   b   . As shown in  FIG.  24   c   , the fourth locking structure  330  includes a slide rail  3301 , a third slider  3302 , and a stopper  3303 . The slide rail  3301  is provided on the outer surface of the insulating housing  321 , and the slide rail  3301  extends toward the third connection port  321   e . The third slider  3302  is slidably connected to the slide rail  3301 . The stopper  3303  is provided at one end of the third slider  3302  close to the third connection port  321   e . The third slider  3302  can slide from a sixth position to a seventh position along the slide rail  3301  in the direction toward the third connection port  321   e .  FIG.  25   a    is a schematic diagram of a structure of a third slider of the fourth locking structure in the base shown in  FIG.  24   a    in a seventh position.  FIG.  25   b    is a partial enlarged view of a region II in the base shown in  FIG.  25   a   . As shown in  FIG.  24   c    and  FIG.  25   b   , the third slider  3302  drives the stopper  3303  to move from a position not covering the third connection port  321   e  to a position covering the third connection port  321   e . Therefore, the boss  001  can be stopped by the stopper  3303  to lock the wiring plug  000  and prevent the wiring plug  000  from falling out of the wiring socket  3292 . 
     In the foregoing embodiment, as shown in  FIG.  24   a   , the fourth locking structure  330  further includes a first elastic buckle  3304  and a first elastic slot  3305 . As shown in  FIG.  24   c   , the first elastic buckle  3304  is provided on the slide rail  3301 . As shown in  FIG.  24   a   , the first elastic slot  3305  is provided on the third slider  3302 . When the third slider  3302  slides to the seventh position, the first elastic buckle  3304  is snapped into the first elastic slot  3305 . In this way, when the third slider  3302  slides to the seventh position, a relative position between the slide rail  3301  and the third slider  3302  can be secured, preventing displacement of the stopper  3303  when stopping the boss  001 . When an acting force applied to the third slider  3302  can overcome an elastic snapping force between the first elastic buckle  3304  and the first elastic slot  3305 , the third slider  3302  can be driven to return to the sixth position to unlock the wiring plug  000 , so that the wiring plug  000  can be unplugged out of the wiring socket  3292 . 
     It can be known that, the positions of the first elastic buckle  3304  and the first elastic slot  3305  may alternatively be provided as follows: The first elastic buckle  3304  is provided on the third slider  3302 , and the first elastic slot  3305  is provided on the slide rail  3301 . This is not specifically limited herein. 
     In some embodiments, as shown in  FIG.  24   c    and  FIG.  25   b   , the slide rail  3301  includes a first slide rail section  3301   a  and a second slide rail section  3301   b , and the second slide rail section  3301   b  is located on the side of the first slide rail section  3301   a  away from the third connection port  321   e . When the third slider  3302  is in the sixth position, as shown in  FIG.  24   c   , the third slider  3302  is located on the second slide rail section  3301   b  and is not located on the first slide rail section  3301   a . When the third slider  3302  is in the seventh position, as shown in  FIG.  25   b   , the third slider  3302  is located on the first slide rail section  3301   a  and is not located on the second slide rail section  3301   b . The first slide rail section  3301   a  is provided with a third sign C, and the second slide rail section  3301   b  is provided with a fourth sign D. The third sign C is different from the fourth sign D. 
     In this way, when the third slider  3302  is in the sixth position, the third sign C is revealed, which means that the wiring plug  000  is in an unlocked state; and when the third slider  3302  is in the seventh position, the fourth sign D is revealed, which means that the wiring plug  000  is in a locked state. Therefore, it can be determined from the third sign C and the fourth sign D that the wiring plug  000  is in the unlocked state or the locked state. 
     In the foregoing embodiment, the third sign C may be the word “ON”, or may be a green coating area, or may include a green coating area and the word “ON” provided on the green coating area. Certainly, the third sign C may also be another sign, which is not specifically limited herein. 
     Correspondingly, the fourth sign D may be the word “OFF”, or may be a red coating area, or may include a red coating area and the word “OFF” provided on the red coating area. Certainly, the fourth sign D may also be another sign, which is not specifically limited herein. 
     In some embodiments, as shown in  FIG.  25   b   , the fourth locking structure  330  may further include a third elastic buckle  3306 . The third elastic buckle  3306  is provided on the slide rail  3301 . When the third slider  3302  is in the sixth position, the third elastic buckle  3306  is snapped into the first elastic slot  3305 . In this way, when the third slider  3302  is in the sixth position, the relative position between the slide rail  3301  and the third slider  3302  can be secured by the third elastic buckle  3306  and the first elastic slot  3305 , preventing displacement of the stopper  3303 . When an acting force applied to the third slider  3302  can overcome an elastic snapping force between the third elastic buckle  3306  and the first elastic slot  3305 , the third slider  3302  can be driven to slide to the seventh position to lock the wiring plug  000 . 
     In some embodiments,  FIG.  26    is a schematic diagram of a structure of the base shown in  FIG.  5    in a fifth orientation. As shown in  FIG.  26   , a first claw  301  and a second claw  302  are provided on a surface of the bottom arm portion  3211  away from the second mounting slot  600 , and the first claw  301  and the second claw  302  constitute two opposite side walls of the first mounting slot  300 . The second claw  302  is fixed relative to the bottom arm portion  3211 , and the first claw  301  can move from an eighth position to a ninth position in the direction toward the second claw  302 , to drive the first claw  301  and the second claw  302  to be snapped onto the mounting rail in the power distribution equipment. In this way, the first claw  301  and the second claw  302  can be slidably snapped onto the mounting rail in the power distribution equipment. 
     In the foregoing embodiment, the base  32  further includes a fifth locking structure  331 . The fifth locking structure  331  is provided between the first claw  301  and the bottom arm portion  3211 . The fifth locking structure  331  is configured to secure a relative position between the first claw  301  between the bottom arm portion  3211  when the first claw  301  moves to the ninth position. In this way, after the first claw  301  and the second claw  302  are slidably snapped onto the mounting rail in the power distribution equipment, the insulating housing can be prevented from falling off the mounting rail due to displacement of the first claw  301 . 
     The fifth locking structure  331  has a plurality of structural forms, which is not specifically limited herein. 
     In some embodiments,  FIG.  27    is a perspective view of a first claw in the base shown in  FIG.  26   . As shown in  FIG.  27   , the fifth locking structure  331  includes a second elastic buckle  331   a . As shown in  FIG.  26   , the fifth locking structure  331  further includes a second elastic slot  331   b . The second elastic buckle  331   a  is provided on the first claw  301 , and the second elastic slot  331   b  is provided on the bottom arm portion  3211 . When the first claw  301  moves to the ninth position, the second elastic buckle  331   a  is snapped into the second elastic slot  331   b . When an acting force applied to the first claw  301  can overcome an elastic snapping force between the second elastic buckle  331   a  and the second elastic slot  331   b , the first claw  301  can be driven to return to the eighth position. This structure is simple and easy to implement. 
     It can be known that, the positions of the second elastic buckle  331   a  and the second elastic slot  331   b  may alternatively be provided as follows: The second elastic buckle  331   a  is provided on the bottom arm portion  3211 , and the second elastic slot  331   b  is provided on the first claw  301 . This is not specifically limited herein. 
     To drive the first claw  301  to move to the eighth position or the ninth position, in some embodiments, as shown in  FIG.  27   , a lifting slot  301   a  is provided on a surface of the first claw  301  facing the bottom arm portion  3211 .  FIG.  28    is a schematic diagram of a structure of the base shown in  FIG.  5    in a sixth orientation. As shown in  FIG.  28   , an operation hole  332  is provided at a position on the bottom arm portion  3211  corresponding to the lifting slot  301   a . The operation hole  332  extends through the bottom arm portion  3211  along the second direction. The operation hole  332  allows the lifting lever to extend into the lifting slot  301   a  to drive the first claw  301  to move to the eighth position or the ninth position. In this way, the operator can drive the first claw  301  to move to the eighth position or the ninth position from the front side of the base  32 . This operation is convenient and easy to implement. 
     In the descriptions of this specification, the described specific features, structures, materials, or characteristics may be combined in a proper manner in any one or more of embodiments or examples. 
     Finally, it should be noted that the foregoing embodiments are merely intended for describing the technical solutions of this application, but not for limiting this application. Although this application is described in detail with reference to the foregoing embodiments, persons of ordinary skill in the art should understand that they may still make modifications to the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features thereof, without departing from the spirit and scope of the technical solutions of embodiments of this application.