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Use DPDT AC Relay as Automatic ON and OFF Switch

Replace Manual Change over with an AC Relay for automatic turning ON and OFF Switch
About the AC relay:

The relay that uses for automatic turning on and off switch is DPDT  (Double Pole Double Throw) AC high voltage and high current Relay. The coil voltage is 220 volts AC. The line voltage is 28v DC  and  250 V AC. The current rating is 120 Amperes.
This is the two poles AC Relay. which has 8 Terminals, two terminal is connected to the relay coil.  Each pole has 3 terminals one is common which is connected to the load. while the other 2 pins which are normally open “NO”  and Normally closed “NC”.NO terminal is connected to the  Generator cable while NC  is connected to the Grid station power.
First, connect the load wires to the common pins of the AC relay. After that connect the Generator wires to the “NO “ pins of the relay. Connect one wire to the one pole NO terminal and the other wire to the other pole NO terminal. Also, connect the Coil terminals to the Generator. After that connect the Grid station power to the NC terminals of the relay. Now Your relay is successfully connected.
How it works:
 When the generator is turn off the relay is also turn off. Because the relay coil is energies from generator power. Thus the load is connected to the grid station. When the generator is turned on the relay coil energies and the contact moves from “NC” to “NO” and the load transfer from the grid station toward the generator. Similarly when the Generator turns off the coil de energies and the contact moves from NO towards the NC and also the load connection transfer to the grid station.
Precaution Warning HIGH VOLTAGE:
Operate and work under the supervision of a qualified person. Use insulated glues insulated shoes and be very careful when you working on high voltage could be lethal.
 Watch Video Tutorial

Hello, Friends, My name is Mohsin Habib and I am an Electrical Engineer. I have Experience In Circuit Designing, Arduino Projects, PLC’s Projects, HMI Designing, Networking and much more. I have done lots of projects in Arduino.

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