FIELD: control systems, switching devices of actuators. SUBSTANCE: proposed contactless circuit breaker has current pickup whose one lead is connected to first bus of power supply source and whose other lead is linked to first lead-out of first resistor and to lead-out for connection of load via switching element. Second lead-out of first resistor is connected to base of first transistor. Control input of switching element is connected via control unit to source of control voltage. First lead of capacitor is connected to first bus of power supply source and its second lead is linked to input of control unit via collector-emitter junction of second transistor. Collectors of first and third transistors are connected to base of second transistor and their emitters are linked to first bus of power supply source. Collector of second transistor is connected to base of third transistor via reference element. Second transistor is placed in parallel with capacitor. Load is switched between lead-out of connection of load and second bus of power supply source. EFFECT: high functional reliability of circuit breaker. 1 dwg
