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. Key Benefits for Contractors 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. Common Questions & Technical Support 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. This item is not eligible for free shipping. 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.
