Electromechanical actuation system for momentary contact control switches

An electronic actuation system for a switch, comprising:

• a first rotary arm that, when rotated, causes a shaft of a switch to rotate from a first rotational position to a second, counterclockwise rotational position;
• a second rotary arm that, when rotated, causes the shaft to rotate from the first rotational position to a third, clockwise rotational position, wherein each of the first, second, and third rotational positions of the shaft correspond to unique mechanical states of the switch;
• a first pull arm selectively engageable with the first rotary arm;
• a second pull arm selectively engageable with the second rotary arm;
• a push arm moveable between a first push position and a second push position,
• wherein, in the first push position, the push arm selectively engages the first pull arm with the first rotary arm and disengages the second pull arm from the second rotary arm, and
• wherein, in the second push position, the push arm selectively engages the second pull arm with the second rotary arm and disengages the first pull arm from the first rotary arm;
• an auxiliary solenoid electronically actuatable to move the push arm between the first push position and the second push position;
• and
• a master solenoid electronically actuatable to move the first and second pull arms between an unactuated position and an actuated position,
• wherein, with the first and second pull arms in the actuated position, the engaged pull arm causes the corresponding rotary arm to rotate, which rotates the shaft from the first rotational position to one of the second and third rotational positions, depending on which of the first and second pull arms is engaged by the push arm.

A momentary contact switch for a circuit breaker, comprising:

• a shaft that is rotatable to first, second, and third rotational positions corresponding to normal, trip, and close positions, respectively, of the circuit breaker;
• a manually operable handle coupled to the shaft to allow for manual rotation of the shaft between the first, second, and third rotational positions;
• a first rotary arm that, when rotated, causes the shaft to rotate to the second, counterclockwise rotational position;
• a second rotary arm that, when rotated, causes the shaft to rotate to the third, clockwise rotational position;
• a first pull arm selectively engageable with the first rotary arm;
• a second pull arm selectively engageable with the second rotary arm;
• a push arm electronically moveable between a first push position that selectively engages the first pull arm with the first rotary arm, and a second push position that selectively engages the second pull arm with the second rotary arm;
• an auxiliary solenoid electronically actuatable to move the push arm between the first push position and the second push position;
• and
• a master solenoid electronically actuatable to move the first and second pull arms between an unactuated position and an actuated position,
• wherein, with the first and second pull arms in the actuated position, the engaged pull arm causes the corresponding rotary arm to rotate, which rotates the shaft to one of the second and third positions based on which of the first and second pull arms is engaged by the push arm.