What does A1 and A2 do 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.

How does a contactor work?

Operating Principle of a Contactor:The current passing through the contactor excites the electromagnet. The excited electromagnet produces a magnetic field, causing the contactor core to move the armature. When current is removed, the coil is de-energized and opens the circuit.

How does a 4 pole contactor work?

4 pole contactors are electrically controlled switches (relays) used for switching an electrical power circuit. A contactor is typically controlled by a circuit which has a much lower power level than the switched circuit, such as a 24-volt coil electromagnet controlling a 220-volt motor switch.

What does L and T stand for on a contactor?

With “L” 1,2,3, the L = “Line”, meaning the incoming supply line. For the load side, “L” already had a different meaning, so the the label is T 1,2,3, with “T” = Terminus, meaning the exit point, ie going to the last thing connected in the circuit.

What is the operation of a relay?

Relays are switches that open and close circuits electromechanically or electronically. Relays control one electrical circuit by opening and closing contacts in another circuit. When a relay contact is Normally Closed (NC), there is a closed contact when the relay is not energized.

What is contactor and its types?

There are different types of contacts in a contactor, and they are; auxiliary contact, power contact, and contact spring. The power contact has two types that are; stationary and movable contact. Material for making contacts must have a high welding resistance and stable arc resistance.

How do you ground a contactor?

Answer: Anything metal is required to be grounded… the base of a contactor or relay is often metal and must be grounded. If contactor or relay is mounted inside metal enclosure, the enclosure must be grounded using a green ground screw, or grounded through the metal conduit.

How do electrical contacts work?

An electrical contact a switch that uses a secondary, low-voltage power source to complete or interrupt circuits that affect an electrical current. Unlike relays, they carry higher circuit loads and connect directly to high-voltage feeds, and they don’t interrupt short circuits like circuit breakers.