It's not rare for electrical equipment to emit a lively, humming, or chattering noise, which can from time to time be adequately loud to keep you conscious at night, interrupt the silence of clean rooms and indicate that something is running not fairly as it should. What roots these noises should be independently diagnosed, but you might find it is because of a noisy contactor. ACs and refrigerating systems are utmost prone to this irritation, but any equipment running on a power circuit or motor is also accountable.

What Grounds a Noisy Contactor?

Any buzzing, whining, or chattering coming from a contactor specifies that there is an issue needing investigation. Three of the common causes of these sounds are inadequate current from the control source to pick up the electromagnetic coil, the improper power supply to the coil, and wreckage on the active mechanisms, i.e., the pole faces of the framework and yoke. It may likewise turn out that the contactor is erroneously positioned, so do take care it is fitted correctly.


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Control voltage

Magnetic coils are designed to pick-up and cover the current when working at 85-110% of their voltage rating. When the device is sealed in operation, its voltage will drop to nearly 60% of its voltage. A magnetic coil can function at 110% of the device's voltage, but if allowable to do so for prolonged periods it will overheat, generating higher temperatures causing contactor noise and abridged coil life. Under-voltage can also be a reason for noisy contactor, so make sure that the device is working within its limits.

Off late, it has been seen that, there is an increased demand for lighting contactors, and will also increase substantially in the future.