A control circuit which uses a maintained contact to energize or de-energize the control coil. This circuit will provide Low Voltage Release.

A circuit which carries the signals directing the performance of the controller. This circuit contains pilot devices such as push buttons, selector and limit switches, timers, pilot lights and  magnetic coils of relays, starters and contactors.

The ability of electrical apparatus to withstand the effects of specified electrical fault current conditons without exceeding specified damage criteria.

See Elementary Diagram.

A device which automatically trips (i.e.: overload relay) and cannot be manually defeated.

See Time, Accelerating

A device consisting of a contactor and overload relays to start-stop a motor from rest to normal speed and to protect motor from overload.

See Device, Output

The cam, arm or similar mechanical piece used to operate the contacts in a device

When applied to a device which interrupts an electric circuit, indicates that the interruption occurs in air.