Forward-reverse jog circuit 

A forward-reverse jog circuit is an electrical control system allowing a motor to run in either a forward or reverse direction, and lets the operator to make small, temporary movements (jogs) in either direction. It combines the functions of a forward/reverse starter and a jogging control, via 2 motor contactors, interlocks to avoid simultaneous energization, and a special circuit keeping a motor running only as a jog button is held down.

It lets a motor to run only as a push button is held down, enabling short, precise movements. This is used for applications like material handling or machine tooling. Unlike continuous running, a jog circuit bypasses a motor starter's holding circuit, via a momentary contact switch or a dedicated jog button to energize the used motor contactor. The reverse function uses a separate reverse contactor and involves swapping 2 of the 3 power leads to reverse the motor's direction.