Abstract: This monitoring unit (1) for monitoring an electrical circuit breaker (D) includes: a central body including: an interconnection device (120) capable of receiving primary voltages (V1) from the circuit breaker, and comprising an electrical power circuit (1220) for converting the primary voltages to secondary voltages (V2); a control device (110), for measuring the secondary voltages (V2) delivered by the power circuit (1220), a removable electrical power supply module (20), comprising a power converter (203), configured to transform the collected primary voltages (V1) into an additional secondary voltage (V2?) and to supply electrical power to a shared electrical power supply bus (1102) of the control device (110).

Abstract: This monitoring unit (1) for monitoring an electrical circuit breaker (D) includes: a central body including: an interconnection device (120) capable of receiving primary voltages (V1) from the circuit breaker, and comprising an electrical power circuit (1220) for converting the primary voltages to secondary voltages (V2); a control device (110), for measuring the secondary voltages (V2) delivered by the power circuit (1220), a removable electrical power supply module (20), comprising a power converter (203), configured to transform the collected primary voltages (V1) into an additional secondary voltage (V2?) and to supply electrical power to a shared electrical power supply bus (1102) of the control device (110).

Abstract: Control device for a multiphase electric motor (M) comprising firstly two two-directional static switches (IS1, IS2) each associated with a terminal of a shunt contactor (S) installed in parallel, these switches (IS1, IS2, S) being controlled by a control circuit (C) controlling progressive operation of the motor, characterized in that the shunt contactor (S) is of the four-pole type and is fitted with solid connection parts (6, 7) each connecting two terminals of the said contactor, these connection parts (6, 7) being connected in pairs (L1, L3) to the terminals of the static switches (IS1, IS2) such that each (IS1 or IS2) is connected to two terminals.

Abstract: Power supply circuit for a single-winding electromagnet coil (11) comprising a low voltage DC power supply (20) and a high voltage AC power supply (30) both connected to the terminals of the winding (11), together with a switching apparatus (40) connected in series with the high voltage supply (30) and capable of supplying or cutting the high voltage power supply to the winding (11), characterized by the fact that the switching device (40) comprises a thyristor (42) connected between the high voltage source (30) and the winding (11) and a control circuit (43) for the thyristor (42) connected to the gate (G) of the thyristor used to cause the thyristor to conduct when the high voltage source (30) delivers the positive phase of a voltage wave.