Electricity: magnetically operated switches – magnets – and electr – Electromagnetically actuated switches – Tripping means
Patent
1996-02-13
1997-10-14
Donovan, Lincoln
Electricity: magnetically operated switches, magnets, and electr
Electromagnetically actuated switches
Tripping means
335 59, 335177, H01H 900
Patent
active
056776578
ABSTRACT:
An electro-magnetic operating device 10 for a circuit breaker includes a coil 12 defining a cavity 14. A stator frame 20 which includes a pole piece 18 is arranged about the coil 12. A tube, which is closed off at one end by an end wall and at an opposed end by the pole piece 18 is arranged in the cavity 14. The tube 24 carries a core 22 therein. The plunger 22 is urged away from the pole piece 18 by a coil spring 28 arranged in the tube 26. The spring 28 is selected so that, when a load current of 100% is carried in the coil 12, the electro-magnetic force imparted to the core 18 exceeds the spring force imparted by the spring 28 to the core 22.
REFERENCES:
patent: 3071664 (1963-01-01), Priesemuth
patent: 4504807 (1985-03-01), Nar
Circuit Breaker Industries Limited
Donovan Lincoln
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