Circuit breaker with independent magnetic and thermal responsive

Details Circuit breaker with independent magnetic and thermal responsive Circuit breaker with independent magnetic and thermal responsive

1982-11-18

1984-07-03

Miller, J. D.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

200151, 335 23, H01H 7302, H01H 7318

Patent

active

044582250

ABSTRACT:
A molded case circuit breaker having a movable contact arm (12) pivotally supported on a operating handle (4) and driven into and out of engagement with a stationary contact (6) by an overcenter toggle spring (28) stretched between the movable contact arm (12a) and a latch lever (14) which is releasable to carry the line of action of the spring (28) overcenter of the movable contact arm (12) to cause automatic separation of the contacts (6,10) in response to operation of a bimetal thermal overload sensing unit (18) and which has a separate magnetic overload current sensing unit (38,40) disposed on the stationary contact support (8) and isolated from the thermal overload current sensing unit (18), the magnetic sensing unit (8) operating to release an insulating wedge member (44) for movement between the circuit breaker contacts (6,10) to separate the contacts independently of the latch trip operating mechanism.

REFERENCES:
patent: 1629640 (1927-05-01), Schactner
patent: 2153396 (1939-04-01), Sambleson
patent: 2254347 (1941-09-01), Blakesley
patent: 2321603 (1943-06-01), Jensen
patent: 2477837 (1949-08-01), Strom
patent: 3311725 (1967-03-01), Butler et al.
patent: 3842228 (1974-10-01), Green

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