Abstract:
The present invention relates to a power supply control module for loads or motors, which is mounted as an addition under a main electromagnetic switch appliance (Ap) and having, in a casing ( 1 ), current paths with commutating poles controlled by an electromagnet control device and substantially characterized by the fact that it includes at the rear, means ( 21, 22, 23, 31, 32 ) capable of channelling gases flowing out of the breaker chambers of the main appliance (Ap).

Description:
BACKGROUND OF INVENTION 
     The present invention relates to an electric power supply control module for loads or motors which are mounted as an addition under a main electromagnetic switch appliance and having in a casing, current paths with commutating poles controlled by an electromagnet control device, as well as means capable of receiving and channelling gases flowing out of the breaker chambers of the main appliance. 
     DISCUSSION OF BACKGROUND 
     It is known how to combine two contactors in order to achieve inversion of the running direction of the motor. 
     It is also known from document FR 2758903 how to combine a main appliance of the contactor or contactor-breaker type, with an inverting module having power supply commutating poles capable of providing inversion of the running direction of the motor. 
     When a module such as the inverting module above is directly mounted under the main electromagnetic switch appliance (contactor or contactor-breaker), the gases which flow out of the breaker chambers of this main appliance do not have sufficient outlet space between the main appliance and the module. 
     SUMMARY OF INVENTION 
     The object of the present invention is to provide a module combined with a main switch appliance able to provide discharge of the gases from this main appliance by channelling them, before discharging them downwards. 
     According to the invention, the module is characterized by the fact that the means for channelling the gases are housed between two boxes housing the commutating poles. According to one feature, the means for channelling the gases are positioned at the rear of a conductor directly connecting a supply terminal with an output terminal without passing through a commutating pole. 
     According to another feature, the means for channelling the gases are formed by a central channel delimited by two partitions and by side channels provided between a partition and a box. 
     According to a feature, the module includes a central vent opening onto the central channel and side vents opening onto the side channels. 
    
    
     BRIEF DESCRIPTION OF DRAWINGS 
     The invention will now be described in more detail with reference to exemplary embodiments and illustrated by the appended drawings wherein: 
     FIG. 1 is a diagram illustrating a main switch appliance combined with a module according to the invention; 
     FIG. 2 is a view of the rear portion of an embodiment of the module according to the invention; 
     FIG. 3 is a vertical sectional view of the rear of the module of FIG. 2; 
     FIG. 4 is a view of the rear portion of a second embodiment of the module according to the invention; 
     FIG. 5 is a vertical section of the rear of the module of FIG.  4 . 
    
    
     DETAILED DESCRIPTION OF INVENTION 
     The module according to the invention, marked out as M in its group of drawings, is combined with a multipolar electromagnetic switch appliance Ap of the contactor or contactor-breaker type. 
     The main electromagnetic switch appliance Ap houses, in a casing, current lines extending between the source terminals L 1 , L 2 , L 3  which connect to the phases of the main AC supply and the load terminals t 1 , t 2 , t 3 . A breaker pole I 1  or I 2  or I 3  controlled by an electromagnet E, the coil of which is supplied with electric current through two supply terminals, is positioned on each current line. 
     The main appliance Ap may have a motor protection function and includes a release device capable of opening the contacts of poles I 1 , I 2 , I 3  when the intensity in a current line reveals a short circuit or an overload. Preferably it comprises a magnetic release sensitive to short circuit currents and a thermal release sensitive to overload currents and to phase unbalances. A manual control button Cms positioned on the front face is for opening the contacts voluntarily and resetting the appliance. 
     Module M which is combined with the main appliance Ap is the realization of a conventional motor control diagram such as: inversion of the running direction, star-delta starting, distribution, changing speed. This module has a casing  1  equipped at the rear with fixing means for fixing it onto a rail or a plate as well as power supply terminals t 1 , t 2 , t 3  directly connected to the load terminals t 1 , t 2 , t 3  of the main appliance Ap and motor output terminals such as U, V, W which are to be connected to the motor(s). 
     The module includes single and bistable contact-breaking commutating poles each positioned on a current line between a power supply terminal t 1 , t 2 , t 3  and a motor output terminal. Each pole is formed by a contact holder  51  or  52  oscillating around an axis between the fixed contact parts  61 ,  62  connected by conductors realizing the motor control diagram at one motor output terminal. The contacts of a pole are always closed alternately except during the switchings. The mobile contact holders  51 ,  52  are moved by a commutating electromagnet combined with an electric or electronic control circuit. 
     Gases from the breaker chambers of the main appliance Ap are discharged under the casing of this main appliance, towards the top of module M. They enter this module M through vents  21 ,  22  and  23  located on the top and are channeled into gas confinement channels or chamber. 
     The embodiment of FIGS. 2 and 3 are for inverting the running direction. The central power supply terminal T 2  is directly connected to the central motor output terminal V through a conductor  9  without any pole. The power supply terminals t 1  and t 3  are connected (running in direct motion) to two motor output terminals via the poles and after switching of these same poles (running in reverse motion) over to the inverted output terminals in order to achieve the usual crossing of the phases. The side poles  51  and  52  are housed in two boxes  41  and  42  housed in the casing. 
     The input vents  21 ,  22 ,  23  enable the gases to enter a chamber or a channel located at the rear and they are located on the top, at the rear, between terminals t 1 , t 2 , t 3  and a rear partition  7  closing the module. The central vent  22  opens onto a central channel located between boxes  41  and  42  on the one hand, and between the central conductor  9  connecting terminal t 2  to output terminal V and the rear partition  7 , on the other hand. This channel is delimited by partitions  31  and  32 . This housing of a central channel between two side poles is possible because of the absence of a central pole and the advanced position of conductor  9 . The side vents  21  and  22  open onto side channels, one provided between partition  31  and box  41  and the other between partition  32  and box  42 . The gases flow in the confinement channels according to the flowing directions F 1 , F 2 , F 3  and may escape downwards through an output vent  8 . 
     The embodiment of FIGS. 4 and 5 includes three commutating poles. Vents  21 ,  22 ,  23  open onto the chambers or chimneys located at the rear. Because there is no central channel like in the embodiment of FIG.  2  and because the discharge of gases is achieved in chimneys or channels, at the same level, the module has a slightly larger depth than that of the module of FIG.  2 . 
     It is understood that alternatives and detail enhancements may be devised without departing from the scope of the invention and the use of equivalent means may also be contemplated.