6/26/2023 0 Comments Wire library memoryWhen the coil is energized, the contacts are closed, and remain closed, until the coil is de-energized. ContactorĪ contactor is a 3-pole electromechanical switch whose contacts are closed by applying a voltage to its coil. Short-circuit protection will not be shown in the examples that follow. Other devices for disconnecting and short-circuit protection may be needed, typically a circuit breaker or fuses. The motor starter must have at least two components to operate: a contactor to open or close the flow of energy to the motor, and an overload relay to protect the motor against thermal overload. Several other combinations are possible in North America and other countries and are easily derived from the methods shown in this document. In North America, an induction motor will typically operate at 230V or 460V, 3-phase, 60 Hz and has a control voltage of 115 VAC or 24 VDC. A motor starter is a combination of devices used to start, run, and stop an AC induction motor based on commands from an operator or a controller.
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