MARS 11919 Start Capacitor

The MARS 11919 Start Capacitor is a high-duty cycle component engineered to deliver the necessary phase shift for starting fractional horsepower motors in demanding HVACR applications. Rated for 270-324 MFD at 110/125VAC, this round electrolytic capacitor provides the high-torque boost required to overcome inertia in compressor and blower motors. Built for reliability, the 11919 features a rugged moisture-resistant case and dual 1/4-inch terminals for clean integration into existing wire harnesses. It is a direct fit for applications requiring an HVAC start capacitor replacement where motor torque is insufficient under load. As a 270-324 uF start cap, it maintains consistent capacitance across its service life, ensuring efficient startup and reducing heat stress on motor windings. This motor starting capacitor is designed to meet OEM performance standards, providing a professional-grade solution for technicians troubleshooting cycling issues or failed motor starts in the field.

• High Capacitance Range: Provides 270-324 microfarads to ensure reliable motor ignition under varying load conditions.
• Industrial Construction: Hermetically sealed to resist humidity and environmental contaminants common in mechanical rooms.
• Universal Compatibility: Standardized round dimensions and terminal configuration allow for seamless installation in 110/125V electric motors.
• Optimized Torque: Specifically engineered to reduce the duration of the start cycle, protecting internal motor components from excessive amperage.

Common HVACR Technical Questions

Can I use a 270-324 MFD capacitor if my original was 250 MFD?
While capacitors are rated within a specific range, exceeding the original MFD by more than 20% can potentially cause winding damage. The MARS 11919 is the professional choice for systems specifically spec'd for the 270-324 uF range at 110V/125V.

What causes a start capacitor like the MARS 11919 to fail?
The most common failure points are excessive heat, faulty start relays that keep the capacitor in the circuit too long, or repeated short-cycling of the compressor.

How do I identify a failing start capacitor?
Look for physical bulging at the top of the casing, fluid leakage, or a motor that hums but fails to turn over. Always verify with a multimeter to ensure it reads within the 270-324 microfarad tolerance.

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.