Protective device for surge current protection of associated equipment in communications systems
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United States of America Patent
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-
Feb 2, 1999
Grant Date -
N/A
app pub date -
Jun 28, 1996
filing date -
Jun 29, 1995
priority date (Note) -
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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.
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