The CL-138 module is a three-phase stator-resistance starter equipped with thermal protection, a start-stop push-button, two (2) pilot lamps indicating the starting steps of the motor and an adjustable time delay.

The connections to the unit are made through 4mm standard colour-coded safety sockets using piggy back plugs.

The specifications and diagram for the unit are silk-screened on the back of a clear-plastic front panel for ease of identification.