(57) Abstract Objective The telephone line which is in the midst of using in when maintaining the telephone lineTo the fact that power supply is cut off is prevented. Constitution The rectifier 1 which supplies electricity to the telephone line and load 2With vis-a-vis the braker 3 which the mediating/helping equipment is done between, alligator 7 of pair,Silicon diode 5,6 is jointed to forward direction in parallel with 7Due to especially, mistaking, power supply to the telephone line which is in the midst of using buAssuming, that it cut off with reka 3, in place of braker 3 shiriPassing by kondaiodo 5,6, when power supply continuesSimultaneously, the sequence which it occurs between the both ends of silicon diode 5,6On the basis of direction voltage drop, the potential difference transistor 8,From the fact that it is amplified with 9, alarm relay 10 to be energized, police/policingInformation buzzer 11 is driven.
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