Thermal response switch and a surge absorbing circuit using the

Details Thermal response switch and a surge absorbing circuit using the Thermal response switch and a surge absorbing circuit using the

1992-06-26

1993-07-27

Broome, Harold

Electricity: electrothermally or thermally actuated switches

Electrothermally actuated switches

Space discharge device

337 75, 337 31, 337 37, 337 66, H01H 6101, H01H 7104

Patent

active

052313670

ABSTRACT:
A surge absorbing element is parallel connected to an electronic device via a pair of communication lines. A normally closed thermal response switch is serially connected between the electronic device and the signal source on the input side of the surge absorbing element. When a surge voltage is instantaneously applied to the communication lines, the thermal response switch remains in the closed position and the surge absorbing element acts to suppress the surge voltage. When an overvoltage or over current is continuously applied to the communication lines, the thermal response pieces of the thermal response switch open and simultaneously release the movable body. Consequently, the electronic device is disconnected from the signal source, thus stopping the continuous overvoltage or overcurrent from flowing to the electronic device and the surge absorbing element. Simultaneously, the reset pin is projected through the casing. After the temperature of the switch decreases, the switch is reset to the closed position by pushing a reset pin which reconnects the electronic device to the communication lines.

REFERENCES:
patent: 2886670 (1959-05-01), Dillon
patent: 4288833 (1981-09-01), Howell
patent: 4635021 (1987-01-01), Hsieh

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