An output line reactor is a inductor that is installed in series with a long cable that connects to a motor starter. It is designed to minimize voltage spikes and harmonics that can damage sensitive equipment and increase energy consumption.

When a motor starter is turned on, it creates a large inrush of current that can cause voltage spikes. An output line reactor helps to reduce these spikes by storing energy in its magnetic field. When the motor is running, the reactor releases this energy, which helps to smooth out the voltage waveform.

Output line reactors are typically used in applications where there is a long cable run between the motor starter and the motor, where there are sensitive electronic devices nearby, or where the motor is frequently started and stopped.

The correct size of output line reactor depends on the motor, the cable length, and the application. You should consult with a qualified electrician to determine the correct size for your application.