What a contactor does
The contactor allows a small control circuit to activate a larger load, such as a motor or a heater.
Frequent faults
- Burnt coil.
- Burnt main contacts.
- Hum or unstable operation.
- Mechanical jamming.
Testing
We check the voltage at the coil and the condition of the contacts. If the coil is receiving the correct voltage but the contactor does not engage, a probable cause is an internal fault.