Circuit protection device

Electricity: electrical systems and devices – Safety and protection of systems and devices – Load shunting by fault responsive means

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361 58, 361 91, 361111, 252 623S, H02H 904

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active

048901822

ABSTRACT:
A circuit protection device for protecting an electrical circuit from a voltage transient, e.g. a voltage transient caused by an electrostatic discharge, lightning or a nuclear electromagnetic pulse, comprises a threshold switching element formed from an amorphous composition comprising germanium, selenium and optionally antimony, and a pair of electrodes in contact with the composition. The devices generally exhibit a good balance of physical properties including switching speed, energy required to latch them in their low resistance state, high resistance state (off) resistance, threshold voltage and capacitance, which enables them to be used successfully to protect electrical circuits from such transients.

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