T55H40-5 SYMBOL 2M

Definition Motor Starter

A device primarily designed to control the supply circuit(s) of a motor in order to accelerate the motor from rest to normal speed. Includes manual starters with overload protection and manual, automatic or semiautomatic starters consisting of combinations of items such as relays, resistors, switches, circuit breakers, etc. Excludes relay-switch; circuit breaker; switch (as modified) and relay (as modified). For devices, which in addition to starting and stopping, reverse, select and/or regulate the speed of a motor, see controller (as modified).