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 dual power automatic transfer switch mechanism, including: a switch housing; a first spring; a second spring; a first pin disposed on a first movable contact corresponding to a first power supply, the first spring acts between the first pin and the switch housing; and a second pin disposed on a second movable contact corresponding to a second power supply, the second spring acts between the second pin and the switch housing; a first driving disk is configured to actuate the first pin moves between a first power-on position and a first power-off position; a second driving disk is configured to actuate the second pin moves between a second power-on position and a second power-off position; wherein the first and second driving disk are configured to rotate synchronously such that the first and the second pin cannot in the power-on position at the same time.

The present invention relates to a drive system for high-voltage electrical devices, such as a load break switch-disconnector and a grounding disconnector, which can be applied in utility grids, allowing said drive system to motorize the switching of both electrical devices. To that end, the drive system comprises a subassembly which allows selecting the motorized switching operation of the first electrical device or the motorized switching operation of the second electrical device. The motorization of the switching of both electrical devices thereby allows performing said operation remotely.

The 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, and a braking mechanism configured to brake the motor in response to the shaft rotated to each position. The apparatus also includes a disc coupled to, and rotatable with the shaft and including a plurality of blocking parts and slots therebetween and a manual lever including a rotatable part and a projecting part arranged at an end thereto. 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.