Auxiliary Contacts in Contactors: Fact or Fiction?

Are auxiliary contacts usually rated at lower amperage than the contactor's primary contacts?

a. True
b. False

Answer:

The correct answer is a. True.

Auxiliary contacts on a contactor are usually rated at a lower amperage than the primary contacts. This is because the primary contacts are designed to carry the full load current of the motor or other appliance that the contactor is controlling. These contacts must be able to handle the high current drawn by the load without overheating or pitting.

On the other hand, the function of the auxiliary contacts is not to carry the heavy load current, but to provide a low current signal to other parts of the control system, such as pilot lights, relays, or the coils of other contactors. Therefore, they are rated at a lower amperage.

It is important to understand the differences in amperage ratings of primary and auxiliary contacts to ensure the safe and reliable operation of the control system.