MARS 11944 Start Capacitor

The MARS 11944 Start Capacitor is a 72-88 MFD motor starting component designed for demanding 220/250Vac applications. This round start capacitor features a hermetically sealed black Bakelite case, engineered to provide a permanent barrier against systemic contaminants including oil, dirt, grease, and moisture. As a veteran-grade HVAC start capacitor replacement, it utilizes advanced electrolytic technology to deliver the high-torque surge required to kick-start compressors and fan motors in single-phase systems. The 11944 model is a industry-standard electric motor start capacitor with a compact 1-3/8 inch diameter and 2-3/4 inch height, ensuring seamless integration during AC capacitor replacement. Designed for 50/60 Hz operation and rated for ambient temperatures from -40°C to +65°C, this 72-88 microfarad capacitor meets strict UL and cUL specifications, making it a reliable choice for professional contractors troubleshooting AC unit humming but not starting issues in residential and commercial equipment.

• Hermetic Bakelite Housing: Provides rugged protection for internal foils against harsh HVACR environments, preventing premature degradation from humidity and oil exposure.
• High Starting Torque: Provides the necessary phase-shifted current boost to overcome locked rotor amperage (LRA) in stalled compressors.
• Optimized Form Factor: Small dimensions allow for universal motor start capacitor application in tight electrical control boxes.
• Reliable Terminal Construction: Features phenolic terminals designed to withstand high heat and severe humid environments without arcing.
• Broad Consistency: Manufactured to meet 72-88 MFD 250V standards, ensuring exact electrical matching for OEM specifications.

How do I know if my start capacitor has failed?
Technicians typically look for a humming noise from the outdoor unit without the motor turning, a bulging top, or visible oil leakage. If the motor struggles to reach full speed or trips the breaker upon startup, the MARS 11944 is often the required fix.

Can I use a higher voltage capacitor than the one I am replacing?
Yes, in motor applications, you can always use a higher voltage rating (e.g., replacing 220V with 250V), but you must never use a lower voltage rating than originally specified, as it will lead to immediate dielectric failure.

What is the difference between a start capacitor and a run capacitor?
A 72-88 MFD start capacitor is only energized for a few seconds to provide the initial torque. It must be paired with a potential relay or centrifugal switch to be removed from the circuit once the motor reaches roughly 75% of its rated speed, unlike a run capacitor which stays energized continuously.

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.