Protector device

Details Protector device Protector device

1989-01-31

1990-10-16

Ng, Jin F.

Telephonic communications

Subscriber line or transmission line interface

Protective circuit

361119, 361 56, H02H 900

Patent

active

049641603

ABSTRACT:
A Protector device 20 connectable between a subscribers line pair and the telephone exchange includes a protector P1 comprising a pair of foldback diodes and fuses F1 and F2 in series with the respective lines which fuses incorporate an impedence/heater element 25. A pair of contacts S1, S2 with meltable insulation provides a fail-safe short circuit path following continued operation of the protector P1. The device 20 will deal with accidental contact with mains voltages that appear on the lines and will also handle short surges due to lightning strikes for example.

REFERENCES:
patent: 3839692 (1974-10-01), Plasko
patent: 4168514 (1979-09-01), Howell
patent: 4502088 (1985-02-01), Baumbach
patent: 4587588 (1986-05-01), Goldstein
patent: 4791523 (1988-12-01), Pick et al.

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