The Dewalt N089178 Control Module manages electrical control and soft-start operation for compatible 120V power equipment. The module regulates the startup process to help provide a controlled increase in motor power when the tool is switched on. This replacement component is designed to replace a worn or damaged control module during equipment maintenance or repair. Proper installati... https://www.wholetoolbox.com/dewalt-n089178-control-module-120v-w-soft-start/N089178.html