FIELD: electricity.
SUBSTANCE: protective device with double alarm and several protective functions is located between telecommunication cable and commutator and includes protection circuit, the first alarm circuit and the second alarm circuit. Protection circuit consists of two identical protection modules which are located on two different signal lines respectively. Each protection module includes thermal resistor and fuse, which are in series connected to one of the signal lines, as well as semiconductor discharge tube and voltage-controlled resistor, which are connected between signal line and earthing wire.
EFFECT: improving reliable protection of service personnel when high voltage is being supplied to the protective device.
5 cl, 3 dwg
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