An apparatus includes: a shaft rotatable to a plurality of predetermined positions to change a state of an electric switching device; a motor rotating the shaft via a transmission mechanism when the apparatus operates in an electric operating mode; a braking mechanism configured to brake the motor in response to the shaft rotated to each position when operating in the electric operating mode; a disc coupled to, and rotatable with the shaft, and comprising a plurality of blocking parts and slots therebetween; and a manual lever comprising a rotatable part and a projecting part arranged at an end thereto, wherein in an apparatus manual operating mode, the projecting part is rotatable into the disc via one of the slots when the shaft is located at one of the positions, and slides out from the disc via another slot when the shaft is rotated to another one of the positions.

Embodiments of the present disclosure relate to a switch device, comprising: a first three-position switch; a second three-position switch disposed below the first three-position switch; a circuit breaker disposed between the first three-position switch and the second three-position switch. A first interlock unit is disposed above the circuit breaker and connected to the circuit breaker and the first three-position switch, and configured to block a manual operation of the first three-position switch in a closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the first three-position switch is manually operated in an open state of the circuit breaker. A second interlock unit is disposed below the circuit breaker and connected to the circuit breaker and the second three-position switch, and is configured to block a manual operation of the second three-position switch in the closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the second three-position switch is manually operated in the open state of the circuit breaker.

In some embodiments, a locking device for an operating mechanism of a gas insulated switchgear, capable of locking or unlocking operations of an operating mechanism of disconnecting switches and earthing switches of the gas insulated switchgear.

Embodiments of the present disclosure relate to a switch device, comprising: a first three-position switch; a second three-position switch disposed below the first three-position switch; a circuit breaker disposed between the first three-position switch and the second three-position switch. A first interlock unit is disposed above the circuit breaker and connected to the circuit breaker and the first three-position switch, and configured to block a manual operation of the first three-position switch in a closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the first three-position switch is manually operated in an open state of the circuit breaker. A second interlock unit is disposed below the circuit breaker and connected to the circuit breaker and the second three-position switch, and is configured to block a manual operation of the second three-position switch in the closed state of the circuit breaker, and configured to block a manual closing operation of the circuit breaker while the second three-position switch is manually operated in the open state of the circuit breaker.

A key switch including: a support base; a key which is manually operable for being moved, with respect to the support base, between at least a first operating position and a second operating position spaced apart from each other, in order to establish or interrupt at least one electric connection; a leaf spring member operatively interposed between the support base and the key; wherein the first operating position is a stable operating position of the key in which the leaf spring member is deformed between the key and the support base so as to take a first curvilinear configuration.

A key switch including: a support base; a key which is manually operable for being moved, with respect to the support base, between at least a first operating position and a second operating position spaced apart from each other, in order to establish or interrupt at least one electric connection; a leaf spring member operatively interposed between the support base and the key; wherein the first operating position is a stable operating position of the key in which the leaf spring member is deformed between the key and the support base so as to take a first curvilinear configuration.

Disclosed herein is a switching apparatus for medium voltage electric systems, said switching apparatus including one or more electric poles. For each electric pole, said switching apparatus includes: a first pole terminal, a second pole terminal, and a ground terminal; a first fixed contact member and a first movable contact member, said first fixed contact member being electrically connected to said first pole terminal and including a first fixed contact, said first movable contact member being electrically connected to said second pole terminal and including a first movable contact; a second fixed contact member and a second movable contact member, said second fixed contact member being electrically connected to said first pole terminal and including a second fixed contact, said second movable contact member including a second movable contact; a vacuum chamber, in which said second fixed contact and said second movable contact are enclosed; and a motion transmission mechanism.

A dual power automatic transfer switch mechanism comprises a switch housing; a first spring; a second spring; a first pin which is disposed to correspond to a first power supply, the first spring acts between the first pin and the switch housing; and a second pin which is disposed to correspond to a second power supply, the second spring acts between the second pin and the switch housing. The dual power automatic transfer switch mechanism further comprises a first driving disk is configured to actuate the first pin moves between a first power-on position and a first power-off position; and a second driving disk is configured to actuate the second pin moves between a second power-on position and a second power-off position. The first and second driving disk are configured to rotate synchronously such that the first and the second pin cannot be in the power-on position at the same time.

Systems and methods are disclosed herein relating to a momentary contact switch that can be both manually and electronically actuated. In some embodiments, an electronic module can be added to a manual momentary contact switch to enable electronic control. The momentary contact switch can be transitioned between first, second, and third electrical states based on the rotation of a shaft between first, second, and third rotational positions. Rotary arms are selectively engaged by pull arms connected to a master solenoid to selectively rotate the shaft from the first rotational position to the second and third rotational positions.

A medium-voltage electric distribution cubicle for fitting between two parts of an electric circuit to cause current flow, current interruption, circuit disconnection, and grounding. This cubicle includes a vacuum break circuit breaker-disconnector or vacuum break switch-disconnector connected in series with a selector switch having at least two positions, namely, a current flow position and a grounding position.