This Rolair start capacitor (MTRC101) is the official replacement component for Rolair 5715K17 direct-drive air compressors, delivering the startup surge the motor needs to begin spinning. It is specified at 710–850 µF (microfarads) with a ±5% tolerance, rated for 125 V AC, and commonly configured as a four-pin unit used in Rolair and related Jenny Air applications. The part number MTRC101 appears in Rolair's parts listings for 5715K17 and similar models, confirming its role as the starter-capacitor assembly within these direct-drive compressors.
