Earth leakage circuit breaker assembly

Details Earth leakage circuit breaker assembly Earth leakage circuit breaker assembly

1997-09-05

1999-07-06

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361102, 361115, 335 18, H02H 316

Patent

active

059204516

ABSTRACT:
A multi-pole circuit breaker assembly for interrupting AC power to a load upon the detection of an earth leakage fault or an overcurrent condition includes a pair of circuit breaker units mounted adjacent to an earth leakage module. The earth leakage module includes an electronic circuit that senses a current imbalance between the power line lead and the neutral line lead using a differential transformer. In response to a current imbalance greater than a predetermined value, the electronic circuit periodically energizes a switching circuit that provides power across a solenoid. The solenoid, when actuated, engages a common trip mechanism to open concurrently the contacts of the circuit breakers units. The common trip mechanism includes an elongated bar that extends through the casing of the earth leakage module and the circuit breaker units. The elongated bar engages a U-shaped trip member pivotally disposed in each circuit breaker. Each trip member has a depending member extending from a leg that trips its respective circuit breaker unit when pivoted upwardly by the solenoid.

REFERENCES:
patent: 3771081 (1973-11-01), Strobel
patent: 4079345 (1978-03-01), Pietsch
patent: 4347488 (1982-08-01), Mune et al.
patent: 5264811 (1993-11-01), Takeda

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