Apparatus for testing protection of an electric power distributi

Details Apparatus for testing protection of an electric power distributi Apparatus for testing protection of an electric power distributi

1999-01-22

2000-07-04

Gaffin, Jeffrey

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 2, 361 6, 335 18, 335195, 324527, 324536, H02H 316

Patent

active

060847565

ABSTRACT:
A tester for an arc fault circuit breaker plugs into a socket in the protected branch circuit. An actuator includes a first spring biasing a moveable contact carried by a pivoted contact arm away from a fixed contact and a momentary closer for momentarily closing the contacts. The momentary closer includes a push button and a second spring coupling the push button to the pivoted contact arm to close the contacts when actuated. Closing of the contacts completes a circuit across the branch circuit resulting in a current producing a magnetic repulsion force which blows the contacts open thereby striking an arc. The arc, which should trip the arc fault circuit breaker is visible through a translucent or transparent section of the molded tester housing. A fuse interrupts any overcurrent and a test light verifies initial energization of the protected circuit and operation of the arc fault circuit breaker.

REFERENCES:
patent: 4144487 (1979-03-01), Pharney
patent: 4549132 (1985-10-01), Yamagiwa et al.
patent: 5224006 (1993-06-01), MacKenzie et al.
patent: 5293522 (1994-03-01), Fello et al.
patent: 5459630 (1995-10-01), Mackenzie et al.
patent: 5691869 (1997-11-01), Engel et al.
patent: 5694099 (1997-12-01), Connell et al.
patent: 5969920 (1999-10-01), Mackenzie

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