CONTACTORS

 A contactor can be best described as a magnetically closed switch. It is the basic unit upon

which the motor starter is built. Contactors are also used for switching ON and OFF of

heavy

loads like furnaces, heaters, capacitors, etc. A contactor consists of an electromagnet, a movable

core, sets of stationary and moving contacts and an arc quenching structure. Contactors can be

broadly classified in to two general types: