Electricity: electrothermally or thermally actuated switches – Thermally actuated switches – With fusible – combustible or explosive material
Patent
1993-06-11
1994-11-08
Donovan, Lincoln
Electricity: electrothermally or thermally actuated switches
Thermally actuated switches
With fusible, combustible or explosive material
337404, H01H 3776
Patent
active
053630831
ABSTRACT:
A temperature responsive electric overcurrent protection module incorporated in an electric circuit on a circuitboard has a PTC resistor which heats up when subjected to an excessive current. Its resistance rises with its temperature to control the current and protect the circuit, including electric components thereof. To protect the circuit against occasionally encountered, large overcurrents, which could damage the circuits and/or cause a burn-out, a thermal switch or overcurrent fuse is provided which comprises an electrically and thermally conductive contact plate, and an associate thermal switch formed by a planar frame secured to the substrate and a spring arm protruding therefrom. The contact plate is spaced from the substrate, and a free end of the spring arm is secured to the contact plate with a heat responsive solder, thereby prestressing the spring arm so that, upon a melting of the solder due to an overheating of the contact plate by the PTC resistor, the spring arm automatically moves away from the contact plate, thereby opening the circuit and preventing damage to it from the excessive overcurrent.
REFERENCES:
patent: 2817734 (1957-12-01), Levy
patent: 3763454 (1973-10-01), Zandonatti
patent: 5055726 (1991-10-01), D'Entremont et al.
patent: 5105178 (1992-04-01), Krumme
patent: 5280262 (1994-01-01), Fischer
Donovan Lincoln
Roederstein Spezialfabriken fuer Bauelemente der Elektronik und
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