System for indicating high temperature event in an electrical po

Details System for indicating high temperature event in an electrical po System for indicating high temperature event in an electrical po

1997-10-01

1999-03-09

Picard, Leo P.

Electricity: electrothermally or thermally actuated switches

Thermally actuated switches

With bimetallic element

337333, 337359, 116221, 116216, H01H 3752, H01H 3708, G08B 1900

Patent

active

058806679

ABSTRACT:
An indicator movable between a set and an alarm position is latched in the set position by a thermally responsive latch disposed to sense ambient temperature within electrical equipment. If a high temperature event occurs, the latch releases the indicator, which moves under resilient bias to its indicating position to present a visible signal that such an event has occurred. Once temperature has dropped below the alarm value within the electrical equipment, the indicator can be moved back to the set position where it is relatched for continued temperature sensing.

REFERENCES:
patent: 3443258 (1969-05-01), Dunham et al.
patent: 3552350 (1971-01-01), Ranney et al.
patent: 4176618 (1979-12-01), Hubert
patent: 4237367 (1980-12-01), Pecota
patent: 4421053 (1983-12-01), Volk
patent: 5461367 (1995-10-01), Altavela et al.
"Preventive Maintenance Aids Business Survival" by Jim Rosenfield, Electrical Contractor--Jun. 1994, pp. 75-77 & 88.

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