A method for detecting insufficient contact pressure between two contacts of an electrical switching unit, including a device for resetting a mechanism for controlling the switching unit following a closure maneuver of the mechanism, the resetting device including a motor configured to complete the closure maneuver of the control mechanism. The method involves detecting whether the motor completes the closure and whether a resetting torque corresponds to a normal resetting torque, by analyzing an envelope curve of current consumed by the motor over time, and, if the motor completes the closure, deducing that a wear is a result of wear in the mechanism or a kinematic chain, and if the motor completes the closure and the resetting torque corresponds to an abnormal rescuing torque, deducing that the wear corresponds to wear in the motor or parts involved in compressing the closure spring.

A current cut-off device 1 includes a plate-shaped terminal piece 2 having a contact 21, a movable piece 4 including an elastic portion 44 formed in a plate shape so as to be elastically deformed and a movable contact 41 arranged at one end portion of the elastic portion 44 and having the movable contact 41 so as to be pressed against and in contact with the contact 21, and a thermally actuated element 5 which biases the movable piece 4 by deforming in accordance with a temperature change and causes a state of the movable piece 4 to be shifted from a conductive state in which the movable contact 41 is in contact with the contact 21 to a cut-off state in which the movable contact 41 is separated from the contact 21. When the state of the movable piece 4 is shifted from the conductive state to the cut-off state, as the movable contact 41 moves, it gets over the contact 21.

An electrical breaking contact, in particular a radial-magnetic-field electrical breaking contact, is provided for a medium-voltage vacuum interrupter, the contact including:

a rod extending along a longitudinal axis, said rod being configured to be passed through by an electrical current,

a contact body extending transversely to the longitudinal axis and including a first fastening surface, the contact body and the rod being coaxial,

wherein the rod includes:

a second fastening surface securely fastened to the first fastening surface,

an abutment surface radially exterior to the first fastening surface (4), the abutment surface being distant from the contact body along the longitudinal axis and turned toward the contact body.

A switching device including at least one main breaker, an actuator configured to cause a change of state of the main breaker, from a first to a second state, counter to a spring generated force, the actuator being powered by a control signal equal to a first level to cause the change of state of the main breaker then to a second, lower level, to hold the main breaker in the second state. The switching device comprises a current sensor configured to control the control signal to increase it to a third level higher than the second level if the current flowing in the main breaker is higher than or equal to a given operating threshold, to avoid a spurious change of state of the main breaker. The switching device comprises a re-armable protection system for controlling the time for which the control signal is held at the third level.

A changeover switch for medium voltage switchgear is provided. The changeover switch includes a first terminal body, a second terminal body, and two elongate pole bodies. The two elongate pole bodies are arranged parallel to each other and rotatably arranged with first ends on opposite sides of, and in direct contact with the first terminal body around a rotation axis. The two elongate pole bodies are rotatable between an open position and a closed position. The second ends of the two elongate pole bodies are positioned in direct contact with opposite sides of the second terminal body. The changeover switch further includes one or more springs arranged between the two elongate pole bodies to urge the two elongate pole bodies towards each other.

A contact bounce reduction system including: a movable member, and a contact bounce damping device including: a body, a first ball and a second ball, a first resilient member and a second resilient member, a piston. The first resilient member holds the first ball in the seat and the second resilient member holds the second ball in the seat when the piston is in a default extended position, and a third resilient member biases the piston towards the default extended position. The movable member actuates the piston towards the retracted position, causing the first ball and the second ball to move radially out from the seat, and the third resilient member to accumulate energy.

A contact bounce reduction system including: a movable member, and a contact bounce damping device including: a body, a first ball and a second ball, a first resilient member and a second resilient member, a piston. The first resilient member holds the first ball in the seat and the second resilient member holds the second ball in the seat when the piston is in a default extended position, and a third resilient member biases the piston towards the default extended position. The movable member actuates the piston towards the retracted position, causing the first ball and the second ball to move radially out from the seat, and the third resilient member to accumulate energy.

An apparatus for preventing over-discharging according to various embodiments of the present invention may comprise: a housing including a first opening; a first electronic component disposed inside the housing; a second electronic component electrically connected to the first electronic component; and a switch for electrically connecting or disconnecting the first electronic component and the second electronic component through an external force by a pin inserted through the first opening. In addition, various embodiments may be possible.

A switching unit for switching an electrical current, the unit comprising separable fix and mobile electrical contacts and a mechanism capable of switching over the contacts between a closed state and an open state. The mechanism comprises a switching shaft coupled to a mobile electrical contact, a trip hook mounted to be pivoted on a fixed support of the mechanism and comprising a bore in which is housed an abutment and a link system coupling the switching shaft to the trip hook. The link system comprises an articulated linkage, which is rotationally linked with respect to the trip hook and which comprises a main bearing surface, which bears on the abutment when the switching mechanism is in the closed state. The abutment is configured to be elastically deformed when the switching mechanism passes from the open state to the closed state and the linkage exerts an effect on the abutment, so as to damp the impact of the linkage on the abutment.

An improved switching device includes a guide configured to reduce undesired movement of the switching element. The guide includes an upper portion configured to receive the switching element and a lower portion configured to receive a spring. The upper portion defines a seat to receive the switching element and includes at least one resilient tab to retain the switching element within the guide. The lower portion defines an opening in which the spring is positioned, where the spring is seated, in part, against the switching element and against the guide. The guide includes guide portions configured to engage a housing on the switching device to prevent rotation of the switching element within the switching device. The switching element further includes protrusions configured to engage each side of the guide and to prevent longitudinal movement of the switching element within the housing.