FIELD: electric power sources. SUBSTANCE: load is disconnected from stabilized source at fault detection. Power supply busbars may be cut off and fault channel may be displayed. Novelty is parallel connection of emitter-base junction of phototransistor and electric current pickup of each channel. Collector of said phototransistor is connected with control input of regulating member. Light emitter is connected in parallel with regulating member of opposite channel. EFFECT: simplified design and enlarged functional possibilities of power source. 3 cl, 12 dwg
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