Before installing contactors may be you want to learn some more information about what is the definition of contactors. First of all, a contactor is a relay which is capable of switching large electrical loads. Contactors and relays are operated by applying a voltage to the coil of an Electro-magnet, which will cause a switch, (or several switches) to close. The circuit that applies the voltage to the coil is referred to as the control circuit, because it controls the main device that the contactor or relay is switching.
The coil voltage of a contactor or relay can be installed for virtually any control circuit voltage, to provide complete flexibility for these devices (both AC and DC), as the control circuit can be completely independent of the load it is switching.
It should be noted that when installing contactors or relays that you always check the coil ratings. They often have not got a default rating of 230volts, and only go bang once if they are connected to the wrong voltage!
The contactor is operated by the control circuit energizing a coil, which can be controlled by any sort of switching device (to perform an assortment of tasks). When the coil is energized, the circuit that the contactor is switching will be energized.
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