Earth leakage trip indicator

Details Earth leakage trip indicator Earth leakage trip indicator

1990-09-19

1992-02-18

Picard, Leo P.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Tripping means

335177, H01N 7500

Patent

active

050897969

ABSTRACT:
A residual current circuit breaker 1 has a partition wall 3 which separates an over-current protection device 4 from a residual current detection circuit 5. A plunger rod 24 extends through a bore 23 in the armature 21 of a coil 20 and is moved independently through the coil 20 to trip the breaker if a residual current is detected by the circuit 5. The plunger rod 24 is moved by a drive rod 31, the operation of which is controlled by a permanent magnet which retains the drive rod 31 retracted and an electromagnet which allows the drive rod 31 to drive forwardly under the action of a spring 32 in the event of a residual current being detected. The plunger rod 30 is reset by a reset lever 40 which is moved when an operating handle 18 of the breaker moves from a non-tripped to a tripped position upon tripping of the breaker.

REFERENCES:
patent: 3440579 (1969-04-01), Smith
patent: 3440580 (1969-04-01), Molenaar
patent: 3470507 (1969-09-01), Hall et al.
patent: 4000444 (1976-12-01), Douglas et al.
patent: 4858056 (1989-08-01), Russell

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