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A contactor is used like a switch. It is used to open and close the circuit it is in series with by electrically energizing and de-energizing the holding coil of the contactor. By having this adaptability the circuit can be remotely operated from a distance and the operator does not have to be in close proximity to the circuit. Contactors are used to remotely operate banks of lighting and of course the contactor is used for motor control. On contactors that control motors an additional overload block is added to the bottom side of the contactor to protect the motors if they get into an over load condition. The N.C. contacts in the overload block will open and the holding coil of the contactor will de-energize and drop the motor off line.
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How do you calculate contactor capacity of star contactor?
metres
What is the difference between an definite purpose contactor and a lighting sontactor?
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).
Can you use an AC contactor in the place of DC contactor?
No, you definitely cannot.
How is a Blowout coil connected?
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.
How many wires to control a mechanically held contactor?
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.
