Conductive polymer circuit protection devices having improved el

Details Conductive polymer circuit protection devices having improved el Conductive polymer circuit protection devices having improved el

1985-03-14

1987-08-04

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Circuit interruption by thermal sensing

361103, 338 22R, 338316, H02H 504, H01C 1016

Patent

active

046850252

ABSTRACT:
Circuit protection devices which contain PTC conductive polymer elements and which are used in situations in which the device is mounted onto, or itself comprises, a rigid wall which is spaced apart from the PTC element and through which the electrodes pass. The behavior of the device can be adversely affected if the electrodes, which are prevented from moving by the rigid wall, prevent the PTC element from expanding to the extent necessary to provide the desired PTC effect. The invention includes the use of specially designed electrodes which lessen the danger that the PTC element, when it is tripped, is prevented from expanding to the extent necessary for effective operation.

REFERENCES:
patent: 3793604 (1974-02-01), Duggan et al.
patent: 4318073 (1982-03-01), Rossler, Jr. et al.
patent: 4331860 (1982-05-01), Roller et al.
patent: 4352083 (1982-09-01), Middleman et al.
patent: 4357590 (1982-12-01), Belhomme
patent: 4413301 (1983-11-01), Middleman et al.
patent: 4481498 (1984-12-01), McTavish et al.
patent: 4504817 (1985-03-01), Shikama et al.

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