MARS 11963 Start Capacitor

As a seasoned technician, you know that a soft-starting compressor or a humming motor that won't kick over usually points to a failing start component. The MARS 11963 Start Capacitor is a industry-standard 108-130 Microfarad 330Vac Round Start Capacitor designed to deliver the critical phase shift and high starting torque required for heavy-duty HVACR compressors. Encased in a hermetically sealed black bakelite housing, this electrolytic motor start capacitor is engineered to withstand the oil, moisture, and high-heat environments common in rooftop units and residential condensers. Rated for 50/60 Hz applications, it serves as a reliable HVAC replacement part for single-phase induction motors. When you're on a service call and need an AC capacitor replacement that fits most standard round brackets, this unit's compact replacement start capacitor dimensions ensure a quick, professional install. Always verify that your microfarad range and voltage rating meet or exceed the motor nameplate specifications to prevent premature winding failure and ensure consistent startup performance under load.

• High Starting Torque: Provides the necessary electrical boost to overcome the initial inertia of compressors and high-static motors.
• Durable Construction: The non-conductive, moisture-resistant bakelite case prevents corrosion and protects internal electrolytic components.
• Enhanced Terminal Design: Improved terminals handle high-heat cycles, reducing resistance and preventing terminal melt-down in humid climates.
• Universal Versatility: The round 108-130 MFD 330V profile is a standard cross-reference for numerous OEM and aftermarket capacitor brands.

• Can I use a 330V capacitor to replace a 250V model? Yes, you can always use a capacitor with a higher voltage rating than the original, but never lower, as it provides a better insulation safety margin.
• Why did my start capacitor fail? Most failures are due to excessive heat, repeated short-cycling of the compressor, or a faulty potential relay that stays engaged too long.
• Does the polarity matter on these terminals? For standard AC motor applications using this HVAC start capacitor, there is no polarity; however, ensure all lead connections are tight and free of oxidation.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.