PTC circuit protection device comprising mechanical stress riser

Details PTC circuit protection device comprising mechanical stress riser PTC circuit protection device comprising mechanical stress riser

1992-01-27

1994-04-12

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

H02H 504

Patent

active

053031156

ABSTRACT:
A circuit protection device in which a PTC element made from a PTC composition includes or has at a boundary thereof a mechanical stress riser. The device will be tripped by, and provide reversible protection against, a first set of fault conditions, and will also provide protection at least one time against a second, more severe, set of fault conditions which cause physical disruption of the device and which cause the device to have a substantially infinite resistance. Devices of the invention are useful in protecting against relatively high voltages.

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