Double-channel three-phase power supply automatic switching circuit circuit diagram

As shown in the figure is a dual-channel three-phase power supply automatic switching line circuit. When using electricity, the knife switches 1HK and 2HK can be closed at the same time, and the 1C normally closed contact disconnects the power supply of the SJ time relay . Supply power to the load. When the power supply A fails for some reason, the 1C contactor is released. At this time, the IC is normally closed, and the power supply on the time relay SJ line diagram is turned on. After the time relay is delayed for a few seconds, the SJ delay normally open point is closed, and 2C is obtained. Electrically attracted and self-locking. Due to the pull-in of 2C, its normally closed point on the one hand disconnects the power supply of the delay relay line diagram, and on the other hand double-disconnects the power circuit of the 1C coil, so that power supply A stops supplying power and ensures that power supply B supplies normal power. If power supply B has been working for a period of time and then has a power outage, the normally closed point of 2C will automatically turn on the power supply of coil 1C to switch to power supply A.

The contactor should be selected according to the load size; the time relay can be an AC time relay of 0~60S .
ck="window.open(this.src)" alt="Click to see larger image" />