a contactor is generally looks like a small box connected to an electric circuit. it is what controls electricity flow to a motor. in the middle is normally a way to push in the contactor to manually check to see if either the motor works or if you have electricity.
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The contactor is the interface or relay between your thermostat (low voltage) and the compressor (high voltage).
When the thermostat senses a rise in the homes temperature a switch in the stat closes sending a 24 volt AC signal to the contactor coil. The coil is actually an electro magnet and the 24 volt signal energizes this magnet which pulls in a bridge containing 2 contacts (120volts each) that sends 240 volts to the compressor and condenser fan starting them.
A contactor is an electronically controlled switch that has a coil and contacts. The contactor coil moves the contacts into position by energizing the contactor. A contactor transmits a current between a source and load.
it is the switch turns the compressor on and off if you look in your unit follow the power wires from disconnect the should go straight to the contactor
A blowout coil connected in series with contactor's auxiliary contacts that shunt around the main contactor contacts. The coil is out of the circuit when the main contactor contacts are closed and in the circuit when the main contactor contacts are open.
A definite purpose contactor is designed (and rated) for a specific load. So a lighting contactor is one example of a definite purpose contactor. A motor starter contactor is another example. So, a lighting contactor is a definite purpose contactor, but a definite purpose contactor is not necessarily a lighting contactor (it might be a motor starter, for instance).
A contactor is a type of switch. However this switch uses electricity to power an electromagnetic coil to switch on or off power. Hence a contactor needs 2 wires - A live/hot wire and a neutral wire. Generally these are connected across the A1 and A2 terminals of the contactor.
A shading coil in a contactor is used to hold the AC contactor's pole faces closed during the transition of the voltage through the zero voltage phase of an electrical cycle.For an excellent description see related links below.
A contactor is tested by using a device called a Multimeter. By setting the multimeter to ohms and rx1 you can clip both prongs to the coil. If the multinmeter moves the contactor is good. If it doesnt move its bad.