Circuit breaker for use on AC and DC circuits

Details Circuit breaker for use on AC and DC circuits Circuit breaker for use on AC and DC circuits

1981-11-04

1983-12-06

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With bimetallic elements

335 43, 337 77, H01H 7116

Patent

active

044196490

ABSTRACT:
A circuit breaker suitable for use on both AC and DC circuits includes a magnetically permeable core surrounding a current carrying conductor of the circuit breaker. A bimetal member is thermally coupled to the core such that induction heating of the core due to overload AC current flowing through the conductor is operative to deflect the bimetal and actuate a trip device. The circuit breaker also includes a pair of braided copper shunts connected between the conductor and the bimetal such that resistive heating of the conductor due to overload DC current flow through the breaker will cause the bimetal to deflect and actuate a trip device. The bimetal is mechanically isolated from the conductor such that relative movement therebetween will not affect thermal calibration of the circuit breaker.

REFERENCES:
patent: 2939929 (1960-06-01), Hobson, Jr.
patent: 3296564 (1967-01-01), Cellerni

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