Method and apparatus for limiting fault current

Details Method and apparatus for limiting fault current Method and apparatus for limiting fault current

1996-08-17

1999-07-27

Leja, Ronald W.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 58, H02H 300

Patent

active

059300930

ABSTRACT:
A method and apparatus for limiting the fault current in a portable welding gun comprising a power circuit, the power circuit comprising a circuit breaker and an isolation contactor, the isolation contactor in series with the circuit breaker, the fault current limited by providing a safety circuit, the safety circuit comprising a safety circuit comprising two resistor/relay pairs, the resistor and the relay of each pair in series with each other and each pair in parallel with a contact of said contactor, the resistors sized to limit the fault current in the power circuit to less than 50 ma.

REFERENCES:
patent: 5430636 (1995-07-01), Kachi

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