Circuit protection device with half cycle self test
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United States of America Patent
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-
Jan 6, 2004
Grant Date -
Oct 25, 2001
app pub date -
Nov 29, 2000
filing date -
Feb 17, 2000
priority date (Note) -
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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.
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