An electrical switch for connecting and breaking a circuit, including: a connecting and breaking mechanism for connecting and breaking the circuit provided with at least a set of movable contacts and stationary contacts; an electromagnetism drive mechanism for controlling the contacts (14, 17) to be actuated so as to realize closed circuit; a housing for accommodating the movable contacts and stationary contacts; an arc-extinguishing mechanism disposed in the housing and corresponded to the movable and stationary contacts (14, 17); a case connected to a base for accommodating the electromagnetism drive mechanism; a bedplate associated with the case; characterized in that the electrical switch further comprises: a holding mechanism disposed on the bedplate for holding the contacts (14, 17) to connect the circuit after the contacts (14, 17) are connected, the holding mechanism is electromagnetic and has a set of electromagnetic attracting mechanism in which a movable iron core is made to be a pothook or a baffle mechanism, the pothook or baffle is attracted so that the pothook or baffle keeps the switch closed by means of hitching or ramming a movable bolt when the electromagnetic attracting mechanism is powered on, and the pothook or baffle is released so that the pothook or baffle is disconnected with the movable bolt to break the switch when the electromagnetic attracting mechanism is powered off, wherein the holding mechanism further includes a coil, a conducting magnet plate, a bracket, and a tension spring, the pothook or baffle intersects the top end of the conducting magnet plate and has an inclined plane at a position where it is contacted with the movable bolt so as to facilitate to disconnect the movable bolt, the movable bolt, the movable iron core and the movable contacts are formed as an integrated unit, and the integrated unit and a spring for disconnecting the movable iron core and a stationary iron core are positioned on the same central line, and the switch further includes a current limiting mechanism disposed on the bedplate for detecting and limiting over-current, said over-current mechanism includes a set of electromagnets corresponding to each of phase circuit and a set of connecting rod mechanisms (86, 87) connected with thereof, said connecting rod mechanism includes a spring; a pushing plate, a bracket and has a pushing bar which can thrust aside the pothook or baffle of the holding mechanism when the over-current occurs. a connecting and breaking mechanism for connecting and breaking the circuit provided with at least a set of movable contacts and stationary contacts; an electromagnetism drive mechanism for controlling the contacts (14, 17) to be actuated so as to realize closed circuit; a housing for accommodating the movable contacts and stationary contacts; an arc-extinguishing mechanism disposed in the housing and corresponded to the movable and stationary contacts (14, 17); a case connected to a base for accommodating the electromagnetism drive mechanism; a bedplate associated with the case; a holding mechanism disposed on the bedplate for holding the contacts (14, 17) to connect the circuit after the contacts (14, 17) are connected, the holding mechanism is electromagnetic and has a set of electromagnetic attracting mechanism in which a movable iron core is made to be a pothook or a baffle mechanism, the pothook or baffle is attracted so that the pothook or baffle keeps the switch closed by means of hitching or ramming a movable bolt when the electromagnetic attracting mechanism is powered on, and the pothook or baffle is released so that the pothook or baffle is disconnected with the movable bolt to break the switch when the electromagnetic attracting mechanism is powered off, wherein the holding mechanism further includes a coil, a conducting magnet plate, a bracket, and a tension spring, the pothook or baffle intersects the top end of the conducting magnet plate and has an inclined plane at a position where it is contacted with the movable bolt so as to facilitate to disconnect the movable bolt, the movable bolt, the movable iron core and the movable contacts are formed as an integrated unit, and the integrated unit and a spring for disconnecting the movable iron core and a stationary iron core are positioned on the same central line, and the switch further includes a current limiting mechanism disposed on the bedplate for detecting and limiting over-current, said over-current mechanism includes a set of electromagnets corresponding to each of phase circuit and a set of connecting rod mechanisms (86, 87) connected with thereof, said connecting rod mechanism includes a spring; a pushing plate, a bracket and has a pushing bar which can thrust aside the pothook or baffle of the holding mechanism when the over-current occurs.