Electrical switching apparatus including a second trip...

Details Electrical switching apparatus including a second trip... Electrical switching apparatus including a second trip...

2006-01-18

2009-02-03

Sherry, Michael J (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

C361S042000

Reexamination Certificate

active

07486492

ABSTRACT:
A receptacle includes separable contacts, an operating mechanism structured to open and close the separable contacts, and two trip circuits. A first microprocessor-based trip circuit includes a first output having a first arc fault/ground fault trip signal, and a second output having a periodic pulsed signal. A second failsafe trip circuit includes an input having the periodic pulsed signal and an output having a second trip signal. The second failsafe trip circuit is structured to output the second trip signal responsive to failure of the first microprocessor-based trip circuit to provide the periodic pulsed signal. A third circuit responds to the first trip signal and the second trip signal and cooperates with the operating mechanism to trip open the separable contacts.

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