Abstract: The present invention relates to an effector comprising power contacts for power supply of a receiver. The effector comprises an operating mechanism for the power contacts, this mechanism being actuated by an electromagnet. Between a power circuit for supplying power to the receiver and the return power circuit, there is connected a measuring and processing unit arranged to measure the impedance at the terminals of the power supply circuit of the receiver. This unit is coupled to a contact of the control circuit. The contact is arranged to cut the power supply of the control circuit in the event of a short-circuit of the power supply circuit of the receiver.

Abstract: An electrical protection apparatus is formed by association of a circuit breaker electrically connected in series with an effector. Switching of the arc onto an electrode when tripping of the mechanism occurs following a fault causes shunting of the effector. The electrode is separated from the stationary contact by an insulating gap, which is dimensioned to enhance said switching of the arc onto the electrode at the beginning of the opening travel of the movable contact, and to guarantee the dielectric withstand in the closed state of the contacts of the circuit breaker, and in the open state of the effector.

Abstract: An electromagnetic actuator comprises a coil associated with a magnetic circuit having a first series of polar parts to drive a rotor, and a second series of polar parts cooperating with a pivoting blade. A return spring causes movement of the blade to a separated position. A latch is rendered active to lock the blade in the separated position during rotation of the rotor, and inactive to unlock the blade enabling its electromagnetic attraction against the polar face, and stopping of the rotor. The actuator has an operating mode either as motor or as electromagnet depending on the position of the blade.