Contactors are electrically controlled switches, similar to relays, but having a higher current rating that are used for switching electrical power to relatively larger loads. Contactors are usually controlled through a control circuit that has a lower power level compared to the load. Contactors are used for controlling electric motors and large lighting loads. They can be useful in industrial as well as commercial applications.

To ensure the quality of the contactor and a long service life, various tests are performed on the contactors. These tests ensure that the logic and timing relationship between the main and auxiliary contacts is appropriate and the contactor has been assembled properly without any incorrect components used or any components missing. The latching and releasing of the contactor takes place within the specified time and at the specified voltages is also verified through these tests.

To ensure that there are no premature on-site failures, contactor testing involves various tests such as Flashing Test, Pick-Up Voltage Measurement, Drop-Off Voltage Measurement, Pick-Up Time Measurement, Drop-Off Time Measurement, Coil Current Measurement, Coil Wattage Measurement, Travel and Bounce Measurements, Humming Test, and HV Test.

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