Vacuum contactor vacuum interrupter media as its main contacts sealed in mcb circuit breaker a special vacuum arc tube. When the operating coil is energized, the armature pull, in the role of the contact spring and vacuum autistic force contact closure; when operating coil power, the reaction force of the spring force to overcome the vacuum autistic armature release, contacts open. When the contactor breaking current, the contact gap will be formed from a metal vapor to form platinum scale, affecting the life of the contactor.
AC contactor selection
AC contactor selection, Circuit Breakers the selection should be reasonable and based on the type of work load parameters. Specifically divided into the following steps:
1. Select the type of contactor
AC contactor according to the type of load is generally divided into Type I, II, III and IV, respectively denoted AC1, AC2, AC3 and AC4. A corresponding class of AC contactor control object is no sense or micro sense load, such as incandescent, resistance furnace; II AC contactor for wound rotor induction motor starting and stopping; three AC contactor typical use is squirrel cage induction motor running and running carve off; four AC contactor for Electric transformer squirrel cage induction motor starting, reverse brake, reverse and jog.
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