Circuit breaker safety interlock unit

Details Circuit breaker safety interlock unit Circuit breaker safety interlock unit

1991-02-25

1992-05-12

Picard, Leo P.

Electricity: circuit makers and breakers

Switch activation inhibitor

200 4314, H01H 708

Patent

active

051130432

ABSTRACT:
The position of the contacts within industrial-rated circuit breakers is externally ascertained by means of an auxiliary switch-contact position verifier accessory. A viewing aperture in the circuit breaker accessory cover provides visual access to a color-coded shutter that forms part of the auxiliary switch accessory and operates off the circuit breaker crossbar assembly. A safety interlock unit attached to the exterior surface of the circuit breaker cover interacts with the shutter to prevent the circuit breaker from being turned on. The interlock unit also interacts with the circuit breaker trip-test button to articulate the circuit breaker operating mechanism.

REFERENCES:
patent: 3649784 (1972-03-01), Middendorf et al.
patent: 3678228 (1972-07-01), Adamson
patent: 4733029 (1988-03-01), Kobayashi et al.
patent: 4754247 (1988-06-01), Raymont et al.
patent: 4864263 (1989-09-01), Castonguay et al.
patent: 4912439 (1990-03-01), Nagy et al.
patent: 4978816 (1990-12-01), Castonguay et al.
patent: 4982173 (1991-01-01), Meiners et al.

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