Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1985-05-23
1988-03-22
Paschall, M. H.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361175, 361211, 307117, 307 39, H01H 6102, H01H 3734, H02H 504
Patent
active
047333235
ABSTRACT:
A light responsive control and overload protection circuit for low voltage illumination systems includes means responsive to ambient light for providing an enabling output. Control means respond to the enabling output for switching heating current on when enabled. Heat-producing means is provided. The heating current passes through the heat-producing means whenever the control means is enabled. Heat-responsive circuit breaker means are in circuit between a low voltage power source and the load. The heat-producing means is thermally coupled to the heat-responsive circuit breaker means to transfer heat thereto and effect and maintain an opening thereof whenever sufficient ambient light is present. Heat-responsive means respond to heat from the heat-producing means to prevent the overheating thereof during overloads and load circuit short circuiting.
REFERENCES:
patent: 1618816 (1927-02-01), Davies
patent: 3048833 (1962-08-01), Bernheim
patent: 3081417 (1963-03-01), Collier
patent: 3496422 (1970-02-01), Horowitz
patent: 3846674 (1974-11-01), McNulty
Bloom Leonard
Paschall M. H.
Williams H. L.
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