Excess current switching device

Details Excess current switching device Excess current switching device

1974-11-19

1976-03-16

Harris, G.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Automatic circuit-interrupting devices

335 38, H01H 7512

Patent

active

039449548

ABSTRACT:
An excess current switching device having particular but not exclusive application in switching direct current power.
The switching device comprises first and second excess current switches. The first switch comprises a break point and a thermal and/or electromagnetic tripping device(s) linked to a latching mechanism and the second switch comprises a break point and an electromagnetic tripping device having a high resistance coil linked to a latching mechanism. The break point of the first switch is connected in parallel with the tripping device of the second switch. When an excess current occurs, the break point of the first switch opens, leaving the tripping device of the second switch in curcuit and this opens the break point of the second switch.

REFERENCES:
patent: 2831935 (1958-04-01), Page
patent: 3264427 (1966-08-01), Hurtle
patent: 3324429 (1967-06-01), Ellenberger
patent: 3706057 (1972-12-01), Ellenberger

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