MARS 11972 Start Capacitor

For high-torque motor applications requiring a reliable kick-start, the MARS 11972 Start Capacitor is a industry-standard choice for HVACR technicians. Rated for 815-970 MFD (microfarads) at 110/125Vac, this round electrolytic capacitor provides the essential phase shift needed for single-phase motors to overcome initial inertia and locked rotor amps (LRA). Housed in a hermetically sealed black bakelite case, this component is engineered to withstand harsh environment variables including oil, dirt, grease, and moisture, which are common in rooftop units and outdoor condensers.

When you are troubleshooting a compressor that hums but fails to turn over, checking the 815-970 Microfarad rating with a multimeter is your first step. The MARS 11972 is a versatile HVAC start capacitor, often used in conjunction with potential relays to drop out of the circuit once the motor reaches approximately 75% of its rated speed. Its robust terminal construction is designed to handle the high heat generated during the starting cycle, ensuring consistent performance in high-demand 125V start capacitor applications.

• High-Torque Performance: Specifically designed to handle 815-970 MFD requirements for heavy-duty motor starts.
• Durable Construction: Features a moisture and oil-resistant black bakelite case to prevent environmental degradation.
• Industry Integration: Standard round physical profile fits most universal capacitor mounting brackets and straps.
• Enhanced Thermal Limits: New terminal design reduces heat generation during peak cycles to maintain system stability.

• Can I use an 11972 to replace a lower MFD capacitor? Technicians should always match the microfarad range specified by the OEM. While the 815-970 MFD covers a wide range, exceeding the manufacturer's spec can lead to winding damage.
• What does a 110/125Vac rating mean for my 120V system? This round start capacitor is dual-rated for 110V and 125V systems, providing a safe operating margin for standard 120V residential and commercial circuits.
• Why did my existing capacitor fail? Frequent cycling, high ambient temperatures, or a sticking potential relay are the primary causes; always test the relay when replacing the 11972.

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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.