Patent Number: 6,674,289

Title: Circuit protection device with half cycle self test

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.

Inventors: Macbeth; Bruce F. (Syracuse, NY)

Assignee: Pass & Seymour, Inc.

International Classification: H02H 3/32 (20060101); H02H 3/33 (20060101); G01R 031/14 (); G01R 031/08 (); G01R 031/02 (); H02H 003/16 ()

Expiration Date: 01/06/2021