Current-limiting component

Details Current-limiting component Current-limiting component

1993-06-04

1995-05-09

Lateef, Marvin M.

Electrical resistors

Resistance value responsive to a condition

Current and/or voltage

338 22SD, 338 23, 338224, 338320, H01C 710

Patent

active

054144035

ABSTRACT:
A current-limiting component having an electrical resistance body arranged between two contact terminals. The resistance body contains a first resistance material having PTC behavior. Below a limit temperature, the first resistance material has a low cold resistivity and at least one current-carrying path extending between the two contact terminals. Above the limit temperature, the first resistance material has a high hot resistivity compared with its cold resistivity. The current-limiting component has uniform switching capability and high rated current-carrying capacity despite simple and inexpensive construction. The resistance body additionally contains second resistance material having a resistivity which is between the cold resistivity and the hot resistivity of the first resistance material. The second resistance material is in intimate electrical contact with the first resistance material and forms at least one resistance path connected in parallel with the current-carrying path.

REFERENCES:
patent: 3878501 (1975-04-01), Moorhead et al.
patent: 4352083 (1982-09-01), Middleman et al.
patent: 4534889 (1985-08-01), van Konyenburg et al.
patent: 4647900 (1987-03-01), Schelhorn
"Keramische Kaltleiter schutzen elektronische Schaltungen", Kainz, Siemens Components 28 (1990) Heft I, pp. 13-16.
"Fullstoffhaltige elektrisch leitfahige Kunststoffe", Mobius, et al., Kunststoffe 78 (1988) 1, pp. 53-58.
"New, Z-direction anisotropically conductive composites", Jin, et al., J. Appl. Phys. 64 (10), 15 Nov. 1988, pp. 6008-6010.

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