Ground fault circuit interrupter

Details Ground fault circuit interrupter Ground fault circuit interrupter

1983-10-05

1986-03-04

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

361 45, 361 91, 361156, H02H 333

Patent

active

045743240

ABSTRACT:
A circuit including a differential transformer for sensing an imbalance in the current flow through hot and neutral wires connected between a power source and load and a relay operable to break the connection in response to an imbalance of predetermined magnitude. The two movable relay contacts are placed directly in the two wires and are normally open, being closed when power is supplied to the relay coil, the input side of which is connected to a switching transistor. Features include connection of the relay coil as a series pass element in the feed circuit to reduce power dissipation and heat, decreasing the likelihood of contact chatter or welding, providing increased protection for the switching transistor without increasing relay contact opening time, and providing fail-safe operation for all of the more common types of failures in the protective circuitry. Open neutral and grounded neutral protection are also provided.

REFERENCES:
patent: 3213321 (1965-10-01), Dalziel
patent: 3633070 (1972-01-01), Vassos et al.
patent: 3731148 (1973-05-01), Fournis
patent: 3953766 (1976-04-01), Howell et al.
patent: 4063299 (1977-12-01), Munroe
patent: 4068276 (1978-01-01), Pintell
patent: 4246621 (1981-01-01), Tsukioka

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