MARS 11951 Start Capacitor

The MARS 11951 Start Capacitor is a professional-grade 189-227 MFD 250V component engineered for high-torque motor starting in commercial and residential HVACR systems. Built with a hermetically sealed black Bakelite case, this round motor start capacitor provides superior protection against oil, moisture, and debris, ensuring stability in demanding environments. Designed as a direct OEM replacement start capacitor, the 11951 features compact dimensions of 1-3/4 inches in diameter by 3-3/8 inches in height, making it an ideal fit for tight electrical housings in condensing units and blower motors. This non-PCB electrolytic capacitor is rated for 220/250VAC applications, delivering the necessary phase shift to initiate compressor cycles effectively under heavy loads. For technicians performing HVAC motor troubleshooting, this unit offers a reliable solution for restoring torque to motors that struggle to turn over during the startup phase. Always verify the microfarad rating and voltage requirements against the motor nameplate before installation to ensure optimized performance.

• High Torque Delivery: Provides a critical energy surge to initiate motor rotation in high-static or high-pressure systems.
• Durable Construction: The reinforced Bakelite housing resists corrosion and environmental contamination.
• Universal Fit: Standardized round profile ensures compatibility with most dual and single-capacitor mounting brackets.
• Industry Compliance: UL and cUL recognized for safety and electrical standard adherence in the field.
• Broad Application: Suitable for use in air handlers, refrigeration compressors, and various pump motors.

• Can I use a 250V capacitor if my old one was 220V? Yes, the voltage rating on a start capacitor represents the maximum capacity; a 250V unit can safely replace a 220V or 230V part.
• What causes a start capacitor like the 11951 to fail? Frequent cycling, extreme temperatures, or a failing start relay can cause internal overheating and venting.
• Does this replace specific Jard or MARS2 numbers? Yes, the 11951 is a standard cross-reference for most 189-227 MFD start capacitors within the 220-250V range.

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.