Electrical load outage detector

Details Electrical load outage detector Electrical load outage detector

1977-08-01

1978-02-21

Harris, George

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

With longitudinally expansible solid element

337396, H01H 7118

Patent

active

040755924

ABSTRACT:
An electrical switch comprises three flat terminals secured to an insulating base. The two outer terminals are arranged in the same plane and a third terminal is arranged midway between the outer terminals and has a contact portion which is spaced slightly from the plane of the outer terminals. An expansion strip is stretched between the outer terminals and when cold extends across the contact portion of the third terminal making contact with it. Load current from a circuit to be monitored is applied through the outer terminals and flows through the expansion strip thereby heating the strip so that it bows away from the third terminal. When the load current ceases, the expansion strip cools and contracts into contact with the third terminal thereby applying a voltage to that terminal from either of the outside terminals. A lamp or other current indicator in circuit with the third terminal indicates the stoppage of the load current.

REFERENCES:
patent: 1150706 (1915-08-01), Ryan
patent: 2968708 (1961-01-01), Sagona
patent: 3174012 (1965-03-01), Siiberg

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