FIELD: electrical engineering. SUBSTANCE: circuit diagram of stand to test contacts of magnetic starter is supplemented with unit controlling tested starter made on the base of two transistors 21 and 22. Emitter of first transistor is connected to emitter of second transistor, to first lead of reservoir capacitor 23 and to plus of stabilized power supply source 8. Base of first transistor 21 is connected via first current-limiting resistor 24 to point of connection of first lead of resistor 25 and first lead of capacitor 26 which form voltage divider. Capacitor 26 is shunted by closing contact 27 of first intermediate relay 10 and second leads of resistor 25 and capacitor 26 are connected correspondingly to minus and plus of stabilized power supply source 8. Collector of first transistor 21 is connected to second lead of reservoir capacitor 23 and via second current-limiting resistor 28 to base of second transistor 22 which collector is connected via coil 18 of second intermediate relay to minus of stabilized power supply source 8. EFFECT: raised operational reliability and expanded functional capabilities of stand. 1 dwg
