MARS 11971 Start Capacitor

The MARS 11971 Start Capacitor is a standard-setting solution for providing the high starting torque required in residential and commercial single-phase induction motors. Rated for 430-516 MFD (microfarads) and 110/125Vac, this round start capacitor is engineered for heavy-duty applications including air conditioning systems, refrigeration compressors, and industrial pumps. Built with a high-quality phenolic resin case, it offers superior moisture resistance and thermal stability in demanding environments, operating effectively within a temperature range of -40°C to 65°C. As a veteran-grade HVAC motor capacitor, it serves as a critical replacement start capacitor to ensure efficient motor ignition and prevent compressor stalling. This unit features standard 1/4-inch double spade terminals for rapid, secure wiring and is OEM-specified to meet EIA 456A and Tecumseh H-115 standards. Whether you are performing a routine AC maintenance service or an emergency HVAC repair, the 11971 provides the reliability needed for high-cycle industrial units and refrigerated display cases.

• Universal Compatibility: Designed for all 110/125V applications requiring a 430-516 MFD rating, making it a versatile addition to any service truck.
• Rugged Durability: The moisture-resistant epoxy-coated molded case prevents premature failure in high-humidity refrigeration environments.
• Optimized Performance: Enhances motor efficiency by Providing a strong artificial second phase for reliable startup under high load conditions.
• Industry Standard Compliance: Meets rigid safety and performance specifications, ensuring consistent microfarad output across the full 50/60 Hz frequency range.
• Quick Installation: Features standard mounting dimensions (1-7/16" diameter x 2.75" height) and dual terminals for effortless replacement of existing units.

Can I use the MARS 11971 if my original capacitor has a 110V rating?
Yes. This capacitor is rated for 110/125Vac, allowing it to safely replace units with standard 110V or 115V ratings, provided the MFD range matches your motor specifications.

What are the symptoms of a failing 430-516 MFD start capacitor?
Common indicators include a humming motor that fails to turn, tripped circuit breakers upon startup, or a bulging/leaking capacitor case. Always discharge the capacitor before testing with a microfarad-capable multimeter.

Is this capacitor suitable for continuous run duty?
No. As a start capacitor, the MARS 11971 is designed only for the initial start cycle (typically less than 3 seconds). It must be switched out of the circuit once the motor reaches speed to prevent overheating.

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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.