The Campbell Hausfeld MC507018AV Compressor Start Capacitor is an electrical component that helps provide the initial phase shift needed to start compatible compressor motors. It stores electrical energy and releases it during startup to help the motor develop the torque required to begin rotating. Once the motor starts, the capacitor functions as part of the motor’s starting circuit.... https://www.wholetoolbox.com/campbell-hausfeld-mc507018av-compressor-start-capacitor-mc0186-mc0193/MC507018AV.html