Electricity: electrical systems and devices – Safety and protection of systems and devices – Circuit interruption by thermal sensing
Patent
1976-09-15
1978-01-10
Duggan, Donovan F.
Electricity: electrical systems and devices
Safety and protection of systems and devices
Circuit interruption by thermal sensing
361 54, 338 20, 338 92, H02H 504
Patent
active
040682811
ABSTRACT:
A temperature responsive resistor is thermally connected to a body of metal oxide varistor material in transient suppression and other applications. In the event of excess energy dissipation in the varistor, the temperature of the thermally responsive resistor increases to provide a trigger signal to a triac or other similar electronic switch which may be utilized to provide an alarm, provide increased cooling to the varistor body, to divert, or limit current flow from the varistor.
Current flow through the temperature responsive resistor may be provided from a third terminal on the metal oxide varistor in which case the circuit is responsive to both total energy dissipation and peak energy dissipation levels in the varistor.
REFERENCES:
patent: 3564293 (1971-02-01), Mungenast
patent: 3600650 (1971-08-01), Obenhaus
patent: 3622849 (1971-11-01), Kelley, Jr.
patent: 3708720 (1973-01-01), Whitney et al.
patent: 3742419 (1973-06-01), Martzloff
patent: 3754200 (1973-08-01), Harnden, Jr.
patent: 3818411 (1974-06-01), Harnden, Jr.
Cohen Joseph T.
Duggan Donovan F.
General Electric Company
Haken Jack E.
Salce Patrick R.
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