Relay start circuit diagram

As shown in the figure below, the figure below is a starting circuit composed of relays, etc. Connect the resistor R to the input end of the power supply. R has two functions. One is to prevent the impact current on the large capacitor C1 from affecting the power supply itself when the power is turned on. The other is to delay the load receiving power for a few seconds. During this process, because the relay J at the output end cannot reach the pull-in voltage of 12, the pull-in R is connected to the circuit to limit the current and reduce the voltage. As the power supply completes charging C1 and C3, the relay J contact pull-in short circuit R, at this time, the power supply enters the normal working state.