CIRCUIT BREAKER TRIPPING DEVICE OPERABLE FROM A LOW ENERGY TRIPPING SIGNAL

摘要

An electric circuit breaker comprising an electromagnetic tripping device. The electromagnetic tripping device comprises an H-shaped structure which is constructed of a permanent magnet disposed between two pole pieces. A trip keeper is releasably held to the pole faces on one end of the H-shaped structure and a reset keeper is movably held to the pole faces at the other end of the H-shaped structure. A winding means encircles one leg of the H-shaped structure and when energized bucks the flux through the magnetic path closed by the trip keeper and boosts the flux through the reset keeper so as to release a trip arm and trip the circuit breaker.