A control circuit with momentary contact devices connected to the coil of the magnetic motor starter performs this start and stop function. ![]() The magnetic motor starter is an electromagnetically operated set of contacts that starts and stops the connected motor load. 430.2 states, “A controller is any switch or device that is normally used to start and stop a motor by making and breaking the motor circuit current.” For this article, we'll concentrate on controllers, specifically the magnetic motor starter variety of controllers. 100, a controller is described as “a device or group of devices that serves to govern, in some predetermined manner, the electric power delivered to the apparatus to which it is connected.” Getting a little more specific, a definition in Art. ![]() ![]() The NEC defines a controller in a few different ways.
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