The MARS 11931 Start Capacitor is a high-duty 124-149 MFD component designed to provide the necessary torque for kick-starting single-phase motors in commercial and residential HVACR applications. This 165VAC round start capacitor is built with a rugged, hermetically sealed phenolic case (Bakelite), which effectively shields the internal electrolytic elements from moisture, grease, oil, and atmospheric debris. Measuring approximately 1-7/16" in diameter and 2-3/4" in height, it is a standard fit for many motor start capacitor replacements where space and reliability are critical. Operating within a frequent 50/60 Hz cycle, this unit ensures your compressor or fan motor reaches 75% of its rated speed quickly before being switched out of the circuit. For field technicians, the JARD 11931 offers a dependable HVAC start capacitor replacement that meets strict OEM tolerances for 124-149 microfarad requirements without the excessive bulk of older style units. Key Benefits for Contractors: Extreme Durability: The Bakelite phenolic housing prevents case rupture and protects against common environmental contaminants found in outdoor condensers. High Torque Output: Rated for 124-149 microfarads, providing optimal starting current for 1/2 HP and other compatible motor profiles. Standardized Form Factor: The compact, round design (approx. 1.44" x 2.75") ensures compatibility with most existing mounting brackets and terminal configurations. Reliable Discharge: Features dual 1/4" terminals for fast connection; recommended for use with a bleed resistor to protect potential relay contacts. Common Questions & Troubleshooting: How do I know if this start capacitor is failing? Look for a bulging top membrane, oil leakage around the terminals, or a motor that hums without turning over. Can I used a 165V capacitor to replace a 110V or 125V unit? Yes, you can always go up in voltage rating if the microfarad (MFD) range matches, but never go lower than the original voltage. What happens if the start capacitor stays in the circuit too long? If the potential relay fails to drop the capacitor out once the motor starts, the unit will overheat and vent. Always check your relay when replacing a blown capacitor. 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.
