A device for switching a medium-voltage electrical circuit, including: a vacuum interrupter including a mobile electrode, an actuating lever linked to the mobile electrode and mobile between an opening position and a closing position, an insulator linked to the actuating lever, a control fitting secured to the mobile electrode, and an elastic return, for example, a spring, exerting a return force between the control fitting and the insulator, wherein a travel of displacement of the actuating lever is greater than the opening distance such that the control fitting is distanced from the insulator when the actuating lever is in the closing position. The switching device further including an indicator stem secured to the control fitting, which is configured to extend at least partly out of the insulator when the actuating lever is in the closing position.

A monitoring method for an electrical energy transfer device which has a first phase conductor and a second phase conductor, includes the following steps: a temperature of the first phase conductor is compared with the temperature of the second phase conductor and a signaling is performed if there is a deviation between the temperatures. The electrical energy transfer device is, for this purpose, equipped at the first phase conductor with a first temperature sensor and at the second phase conductor with a second temperature sensor.

A method for manufacturing a trip unit that connects to a circuit breaker. The method includes mounting an assembly formed by a shaft and a trip member in a first case, mounting a detecting member in a second case, and assembling the first case and the second case, a contact end cooperating mechanically with the trip member such that the trip member trips the circuit breaker in the assembled configuration of the trip unit when the corresponding detecting member detects an electric fault.

A switching device for a medium-voltage electrical circuit including: a frame; a vacuum circuit breaker including a fixed electrode relative to the frame and a mobile electrode; an elastic member; and an actuating lever connected to the mobile electrode via the elastic member, The actuating lever is movable between an open position in which the electrodes are separated by an open distance, and a closed position in which the electrodes are in contact. A passage of the actuating lever from the open position to the closed position defines a displacement stroke, greater than the open distance such that the elastic member is compressed when the actuating lever passes from the first position to the second position. The switching device includes at least one removable spacer arranged between the frame and the fixed electrode.