MARS 11965 Start Capacitor

For high-torque motor starting applications, the MARS 11965 Start Capacitor is a industry-standard solution designed to provide the necessary phase-shift for single-phase induction motors. This 124-156 MFD 330V electrolytic capacitor is housed in a rugged, hermetically sealed black bakelite case, ensuring maximum protection against environmental contaminants such as oil, dirt, and moisture. Techs in the field value the round start capacitor design for its compact footprint and 1/4-inch quick-connect terminals, which streamline installation in cramped electrical cabinets. Operating within a 50/60 Hz frequency range, this HVAC motor start capacitor delivers the sudden burst of energy required to overcome the static inertia of compressors and blower motors. Integrating a MARS 11965 replacement into your service call ensures reliable torque delivery and reduces mechanical stress on motor windings during the critical startup phase.

• High-Torque Performance: Provides a precise 124-156 microfarad range to initiate rotation in heavy-duty HVAC compressors.
• Durable Construction: Features a non-conductive, moisture-resistant bakelite housing to prevent dielectric breakdown in harsh environments.
• Universal Compatibility: Standardized 330Vac rating and round capacitor geometry allow it to replace a wide variety of OEM and aftermarket parts.
• Field-Ready Design: Built with 1/4-inch terminals for fast, secure electrical connections during service.

How do I know if my start capacitor has failed?
Common indicators include a motor that "hums" but fails to turn, visible bulging or leaking from the bakelite case, or if the capacitance measures outside the 124-156 MFD range during a multimeter bench test.

Can I use a 330V capacitor to replace a 250V unit?
Yes, you can safely use a 330V start capacitor like the MARS 11965 to replace a lower voltage unit, provided the microfarad (MFD) rating matches the motor's requirements. Never down-gauge the voltage rating.

What is the difference between a start and a run capacitor?
A start capacitor like this MARS 11965 stays in the circuit only for a fraction of a second to get the motor up to speed, whereas a run capacitor stays energized continuously while the motor is in operation.

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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.