Protective circuit and protective plug for telecommunication installations
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United States of America Patent
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-
Mar 29, 1994
Grant Date -
N/A
app pub date -
Jul 30, 1991
filing date -
Aug 14, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The invention relates to a protective circuit for the protection of the user from overvoltage and overcurrent, in particular for telecommunication installations. Prior art protective circuits comprise a fuse connected into the line connection, and a surge arrester with a heat-sensitive protection device, forming a cross path between the current path of the line connection and the earth conductor, the heat-sensitive protection device disconnecting the cross path in case of excessive power, and connecting it to the earth conductor. In the protective circuit according to the invention, a response of the heat-sensitive protection device (5, 6) will cause disconnection of the cross path of the surge arrester (1, 2) and closing of a short-circuit cross path (7, 8) behind the fuse (3, 4) between the line connection (a, a'; b, b') and the earth conductor (E). The protective circuit can be accommodated in a miniature plug for application in telecommunication installations.
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