Circuit interrupter with improved surge suppression

Details Circuit interrupter with improved surge suppression Circuit interrupter with improved surge suppression

2005-05-31

2005-05-31

Jackson, Stephen W. (Department: 2836)

Electricity: electrical systems and devices

Safety and protection of systems and devices

Transient responsive

C361S093600

Reexamination Certificate

active

06900972

ABSTRACT:
A suppression and protection circuit is used in conjunction with a circuit interrupter. In one configuration, a voltage clamping device such as a metal oxide varistor is utilized in a ground fault circuit interrupter product for handling transient surges and overvoltage conditions and is placed in series with a solenoid coil. The suppression and protection circuit includes a crowbar device across the line such as a header spark gap to prevent overvoltages, and a low pass filter such as an LC filter for suppressing transient surges.

REFERENCES:
patent: 3731154 (1973-05-01), Torosian
patent: 4587588 (1986-05-01), Goldstein
patent: 4901183 (1990-02-01), Lee
patent: 5418678 (1995-05-01), McDonald
patent: 5448443 (1995-09-01), Muelleman
patent: 5555150 (1996-09-01), Newman
patent: 5617284 (1997-04-01), Paradise
National Semiconductor Corp. Jun. 1992, LM1851 Ground Fault Interrupter, Data Sheet, pp. 1, 6.

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