How you can Wire A 120V AC Relay Single Pole

Many household doorbells use 120-volt alternating current (AC) single-pole relays to activate its bell ringer. Single-pole relays use an electromagnetic coil, a wire wrapped around a metal rod, to trigger a single switch. When electricity flows through the coil, a magnetic field forms in the metal rod. The magnetic field pulls a switch toward the metal rod and, depending on the appliance, the switch either opens or closes. Four wires connect to 120-volt AC single-pole relays.

Things You will Need
Wire terminal connectors

Inspect the relay’s wiring diagram and identify each wire terminal. The wiring diagram, found on the other side of the relay as the wire’s terminals, labels and identifies the terminals. Two terminals, identified as “L1” and “G” or “C”, go to the coil-shaped a part of the wiring diagram and represent the relay’s trigger. One in every of the opposite terminals, identified on the wiring diagram as a dot with an angled line coming from it, connects to the relay switch’s electricity feed. The remaining terminal, identified by a dot, connects to the relay switch’s electricity output.

Pinch wire-terminal connectors onto each wire that can hook up with the relay’s terminals with pliers. The wire will slide into the round end of the terminal connector. Squeeze the round end with pliers until the terminal connector makes solid contact with the wire. The rectangle end of the terminal connectors will slide onto the relay’s terminals.

Identify the wire that connects to the relay coil’s electricity feed. This wire will result in a switch, like a doorbell button. Push this wire’s terminal connector onto the relay terminal marked “L1.”

Identify the wire that connects to ground. Push this wire’s terminal connector onto the relay’s terminal marked “G” or “C.” This completes the coil part of the relay’s circuit.

Identify the switch’s electricity feed wire. This wire should lead to a fuse or circuit breaker. Push this wire’s terminal connector onto the wire terminal identified with a dot and angled line.

Identify the wire that results in the device the relay controls, the remaining wire. Push the wire onto the relay’s remaining switch terminal, identified by a dot.

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Photo Credit 12 volt relais, relay image by Sascha Zlatkov from
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