Electrical circuit protection apparatus

Details Electrical circuit protection apparatus Electrical circuit protection apparatus

1974-12-30

1976-05-25

Miller, J. D.

Electricity: magnetically operated switches, magnets, and electr

Electromagnetically actuated switches

Retarded or delayed type

317 31, 317 51, 317 62, 335151, 335153, H02H 310

Patent

active

039596940

ABSTRACT:
An electrical circuit protective arrangement in which a reed spring relay has provided a back contact probe element associated with one of the springs and makes contact therewith when the normally closed springs are open and presents a gap with the associated spring when the springs are closed. The springs are serially connected in the electrical circuit and are of a magnetically responsive material so that the springs are forced open when an undesirably high current is present in the circuit which in turn completes a detection and alarm circuit when the probe element makes contact with the spring. The relay envelope contains a gas which ionizes in the gap to complete the same detection and alarm circuit when a dangerously high voltage appears across the gap although the springs remain closed.

REFERENCES:
patent: 2329518 (1943-09-01), Dimond
patent: 3492532 (1970-01-01), Fayling
patent: 3858089 (1974-12-01), Poindexter

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