Patent ID: 9466447
Filing Date: 2016-10-11
CPC Classification: H01H

Claim Text:
1. An actuator device for actuating the contacts of a high or medium voltage circuit breaker having at least one movable contact, the device comprising: a rigid drive shaft that drives the at least one movable contact, resilient means for driving the at least one movable contact, a torsion bar for driving the drive shaft and a lost-motion element through which the torsion bar is configured for applying a torque to the drive shaft during an initial period of an opening operation of the at least one moveable contact of the circuit breaker, wherein the torsion bar is housed inside the drive shaft, a first end of the torsion bar being constrained to turn with a ring of the lost-motion element, a second end of the torsion bar being constrained to turn with the drive shaft, the actuator device comprising only one drive shaft and only one torsion bar.