Circuit protection device with half cycle self test

Details Circuit protection device with half cycle self test Circuit protection device with half cycle self test

2005-03-29

2005-03-29

Deb, Anjan K. (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

Of ground fault indication

C324S424000, C324S524000, C361S045000

Reexamination Certificate

active

06873158

ABSTRACT:
A circuit protection device connected between two lines of an AC power source self checks for an introduced simulated ground fault every half cycle during a period when a trip SCR cannot conduct. If the self check fails, the device is tripped on the next half cycle of different phase. Possible responses to the self check failure include lighting an indicator lamp and locking out the device reset mechanism.

REFERENCES:
patent: 5600524 (1997-02-01), Neiger et al.
patent: 6674289 (2004-01-01), Macbeth

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