To facilitate the assembling work by tripping a circuit breaker when the detected voltage becomes the reference voltage or below, releasing the engagement with a crossbar, and moving an actuator to the reset position with a reset lever via the energizing force of a lever spring.
When the detected voltage is lowered to the reference voltage or below, the electromagnetic force of an electromagnet 21 is decreased, and the attracting force attracting a plunger 22 to an anvil 21b is weakened. The attracting force becomes smaller than the energizing force of a plunger spring 23, and the plunger 22 is dissociated from the anvil 21b. An actuator 25 is interlocking moved in the direction of an arrow K by the energizing force of the plunger spring 23, a trip bar 40 is rotated CCW to the position shown by a solid line from the position shown by a chain line, and the opening/closing mechanism section of a circuit breaker is operated to trip the circuit breaker.
| WO/1994/014178 | DISK DRIVE POWER MANAGEMENT SYSTEM |
| JP3867540 | SWITCHING DEVICE |
FUSHIMI YUKIHIRO
YABE TOSHIYUKI
