Ground fault current protective device

Details Ground fault current protective device Ground fault current protective device

1988-12-05

1990-06-26

Thompson, Gregory D.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

361393, H05K 700

Patent

active

049377060

ABSTRACT:
A ground fault trip unit of the three-pole type, comprises a fourth conductor passing through the differential transformer. The fourth conductor is connected to terminals located on a different face from that of the terminals of the other three conductors. The same ground fault trip unit can be associated with a three-pole breaking device, in which case the fourth conductor is not used, and with a four-pole device whose fourth pole is connected to the fourth conductor of the ground fault trip unit.

REFERENCES:
patent: 2924688 (1960-02-01), Edmunds
patent: 3812400 (1974-05-01), Gryctko et al.
patent: 4568899 (1986-02-01), May et al.
patent: 4794485 (1988-12-01), Bennett

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