Protective device for surge current protection of associated equ

Details Protective device for surge current protection of associated equ Protective device for surge current protection of associated equ

1996-06-28

1999-02-02

Thompson, Gregory

Electricity: electrothermally or thermally actuated switches

With diverse art-type device

337 14, 337298, 361 27, 361106, 338 22R, 338 7, H01H 3700, H02H 504

Patent

active

058670831

ABSTRACT:
A small-size high-performance electronic protective device (10) is provided for use in protecting communication equipment including an exchange servicing module against application of abnormal surge current due to accidental shorts between adjacent ones of power feed lines in a communications system. The protective device (10) includes positive thermistors (3a, 3b) connected between communication link input terminals (1a, 1b) and output terminals (1c, 1d) coupled to an associative equipment being protected. The protective device (10) also includes thick-film resistive elements (5a, 5b), which are connected in parallel with the thermistors (3a, 3b), respectively.

REFERENCES:
patent: 3978443 (1976-08-01), Dennis et al.
patent: 4494104 (1985-01-01), Holmes
patent: 5204799 (1993-04-01), Stibila
patent: 5254969 (1993-10-01), Caddock, Jr.
patent: 5379022 (1995-01-01), Bacon et al.

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