Load break switch with built-in ground fault sensing

Details Load break switch with built-in ground fault sensing Load break switch with built-in ground fault sensing

1981-08-05

1982-12-07

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Ground fault protection

335 18, 361347, H02H 328

Patent

active

043630634

ABSTRACT:
A plural phase high current low voltage load break switch with built-in ground fault sensing comprises an insulator base and a plurality of individual phase circuits mounted on and extending across the base in parallel spaced relation to each other, each phase circuit including, in series, an input connector, a fixed switch contact, a movable switch contact, a fuse, and an output conductor; a neutral conductor is mounted on and extends across the base in parallel spaced relation to the phase circuits. A switch operator mechanism mounted on the base is connected to all of the movable switch contacts for opening and closing these contacts simultaneously; that mechanism includes an electrically operated trip actuator for actuating the operator mechanism to open the switch contacts. A zero sequence ground fault sensor coil is disposed in encompassing relation to all of the phase circuits and the neutal conductor; the sensor coil is aligned with the movable switch contacts. A control relay is electrically connected to the ground fault sensor coil and to the trip actuator for energizing the trip actuator in response to the sensing of a ground fault condition by the sensor coil.

REFERENCES:
patent: 3505566 (1970-04-01), Conrad
patent: 3582595 (1971-06-01), Stene
patent: 4172271 (1979-10-01), Hobson, Jr.

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