AC contactor silent operation circuit

 AC contactor silent operation circuit
has been widely used in industrial and agricultural production due to its advantages of significant power saving effect, no noise, low operating temperature, and extended service life.
    The working principle is shown in the figure. Press SB2, when the N terminal of the power supply is positive and the U terminal is negative, VD] is connected to the circuit and supplies
pulsating DC power to the contactor KM. The contactor KM operates and the normally closed contact KM is disconnected
, and Ri and VD1 exit the circuit. When the U terminal is positive and the N terminal is negative,
VD2 is forward-conducting, charging the capacitor c2, and at the same time turning on the contactor
KM freewheeling circuit. When the N terminal returns to positive, the contactor KM
maintains DC power supply by the charging current of the capacitor c].
    S is the AC/DC transfer switch. If the rectifier circuit needs to be repaired for failure
, the transfer switch S can be put into the AC device to switch the contactor to AC
operation without affecting the normal operation of the electrical equipment. When
    the commonly used AC contactor silent operation circuit model is CJ10-100,
the capacitance capacity is 1. 47yF/400V, and the diode model is 1N4007;
when the model is CJ10-150, the capacitance capacity is 1.47yFl400V. The diode
model is 1N4007; when the model is CJ12B-250, the capacitor capacity is 2, F/400V, and the diode model is IN4007.