Shunt trip mechanism for a circuit interrupting device

Details Shunt trip mechanism for a circuit interrupting device Shunt trip mechanism for a circuit interrupting device

1978-10-16

1981-04-21

Braun, Fred L.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

H01H 7300, H01H 7502

Patent

active

042635721

ABSTRACT:
A shunt trip mechanism includes a ratchet facility added to a self-contained, line potential stored-energy operating mechanism of a circuit interrupting device. Operation of the ratchet facility releases the stored energy to operate the device. A portion of the ratchet facility may also be operated to reset the device if it has previously been operated by either the shunt trip mechanism or the operating mechanism's current-responsive elements. The main portion of the shunt trip mechanism is at ground potential and is mechanically tied to and operates the ratchet facility by a movable insulated strut. The strut is moved by the shunt trip mechanism upon the occurrence of an event such as transformer overpressure. A ground level handle may be operated to reset the device whether it was operated by the operating mechanism or the shunt trip mechanism.

REFERENCES:
patent: 1193695 (1916-08-01), Jacobs
patent: 2145140 (1939-01-01), Starr
patent: 3663906 (1972-05-01), Barkan et al.

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