Control of the magnetic starter with one button. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches
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To control the magnetic starter with one button, the device shown in the figure is proposed.
When you press the SB1 button through the resistor R1, a positive pulse is supplied to the control electrode of the thyristor VS1. The thyristor VS1 opens and the magnetic starter KM1 is turned on, which, with its contacts KM1.1, KM1.2, KM1.3, turns on the load, and the contacts KM1.4 prepare the circuit for turning off the thyristor.
The next time you press the SB1 button, the voltage from the charged capacitor C2 is applied to the thyristor VS1 in reverse polarity, it closes and turns off the magnetic starter. The next time you press the SB1 button, the KM1 starter turns on again.
Parallel to the SB1 button, you can turn on other buttons and control the load from other places.
Resistor R2 type PEV-7,5 200 Ohm or two MLT-2 430 Ohm resistors connected in parallel.
Capacitor C1 20 uF x 300 V, C2 - 0,1 uF x 250 V.
Author: V.F. Yakovlev, Shostka, Sumy region
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