Colour Name:25004 The contactor is an electrically controlled switch used to switch a relay-like power circuit except with higher current ratings and some other differences, the contactor is controlled by a circuit that has a much lower power level than the circuit switched.Contactors come in many forms with different capacities and characteristics. Unlike a circuit breaker, a contactor is not intended to interrupt a short circuit current. Contactors range from those that have a break current of several amps to thousands of amps and 24 vdc for many kilovolts. The physical size of the contactors ranges from a device small enough to hold with one hand to large devices about a meter on one side. Contactors are used to control electric motors, lighting, heating, capacitor banks, thermal evaporators, and other electrical charges.Contactors are evaluated by contacting projected load current (pole), maximum fault resistance current, duty cycle, design life expectancy, voltage and coil voltage. A general purpose motor control contactor may be suitable for heavy duty starting on large motors; The so-called defined purpose contactors are carefully adapted to such applications as starting the air conditioning compressor motor.
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