# How do you wire a 3 phase contactor?

## How do you wire a 3 phase contactor?

How to Wire a Three-Phase Contactor

1. Shut off the power to the three-phase load.
2. Take additional black, red, and blue three-phase wire that is the same size as the supply wires and connect one end of these wires to the T1, T2, and T3 terminals on the contactor.

Does a 3 phase contactor need a neutral?

A: Because the supplied three-phase electricity consists of three voltages which are phase-shifted by 120° from each other. Therefore, at any instant in time, current will be returning from the load to the source through at least one phase conductor, without the need of a neutral conductor or a ground conductor.

What does A1 and A2 mean on a contactor?

One side of the contactor coil (A2) is connected directly to one of the incoming power lines. The other side of the coil (A1) has two possible pathways to complete a connection to the other incoming power line.

### What is NO and NC In contactor?

Normally open(NO) and Normally closed (NC) are terms used to define the states of switches, sensors or relay contacts under when its coil is not excited.

What happens if you connect neutral to ground?

Connecting the neutral to the ground makes the ground a live wire. The neutral carries the current back to the panel. But the ground doesn’t carry a charge, not unless something has gone wrong (such as a short circuit) and it has to direct wayward electricity away from the metal case of an appliance.

What does neutral wire do in 3 phase?

A neutral wire allows the three phase system to use a higher voltage while still supporting lower voltage single phase appliances. This makes it possible to eliminate the neutral conductor on some lines; all the phase conductors carry the same current and so can be the same size, for a balanced load.

## What does T1 and T2 mean on a contactor?

T1 and T2 are probably the thermostat switch terminals. For heat, T1 and T2 contacts would “close” when the temperature is falling and it reaches the set point. The heat would then come on and as the temperature would rise above the set point, the contacts would “open”, thus stopping the heating.

What are the terminals on a contactor?

The L1, L2, and L3 terminals are where the power wires connect to the contactor. The T1, T2, and T3 terminals are where the device wires connect to the contactor. The L1 contact connects to the T1 contact, the L2 contact connects to the T2 contact, and the L3 contact connects to the T3 contact.

How do you hook up a contactor?

Contactor Connection Procedure

1. Generally the magnetic coil of a contactor is designed to operate at a low voltage such as 230V AC, 110V AC, 24V DC, etc.
2. Connect the main power supply terminal with the incoming terminals of the contactor.
3. Connect the load with the outgoing terminals of the contactor.