PTC element

Details PTC element PTC element

1991-10-25

1995-01-17

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 22SD, 338 99, 338114, 338232, 338260, H01C 710, H01C 1010

Patent

active

053829387

ABSTRACT:
A PTC element has at least one body and two electrodes. The body or bodies has/have and is/are two parallel surfaces, of an electrically conductive polymer composition with a positive temperature coefficient. At least one of the parallel surfaces on the body, or on one of the bodies, of polymer composition is in free contact with an electrode or with a parallel surface on another body of electrically conductive polymer composition. A pressure device exerts a pressure directed perpendicularly to the parallel surfaces on the body, or the bodies, on the electrodes. The pressure device is preferably provided with pressure-exerting devices with the ability to be resilient. After changing from a low resistance to a high resistance state, the PTC element returns to the initial resistance and is reusable after having been subjected to short-circuit currents. The parallel surfaces on the body, or the bodies, of polymer composition may be concentric.

REFERENCES:
patent: 2978665 (1961-04-01), Vernet et al.
patent: 3878501 (1975-04-01), Moorhead
patent: 3914727 (1975-10-01), Fabricios
patent: 4331861 (1982-05-01), Meixner
patent: 4414052 (1983-11-01), Habata et al.
patent: 4698614 (1987-10-01), Welch et al.
patent: 4924204 (1990-05-01), Uchida
patent: 4939498 (1990-07-01), Yamada et al.

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