Protective device and communication device
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
Feb 10, 2004
Grant Date -
Apr 25, 2002
app pub date -
Aug 3, 2001
filing date -
Aug 4, 2000
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus to indicate a state where a communication device connected to a communication wire and a power line is protected from a surge current. A toroidal coil picks up a rapid increase of current caused by a rapid increase of voltage that occurs in the communication wire and/or the power line. The toroidal coil is connected to the current detecting unit. The current detecting unit converts the current from the toroidal coil into a voltage and supplies it to a switching circuit. The switching circuit turns on an indicator light circuit to light up an LED of the indicator light circuit.
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