There are two separate circuits when it comes to motors and motor control. The main power circuit is what supplies the power to the motor itself to cause it to run. What determines when that power is ...

Overload devices protect motors, motor control equipment, and motor branch-circuit conductors against excessive heating due to motor overloads and failure to start, but not against overcurrent (e.g., ...

For the PDF version of this article, click here. Motor controllers used to power, stop and control the speed of a variety of motors must deal with a wide variety of surges due to switching events.