MARS 11953 Start Capacitor

The MARS 11953 is a high-torque round motor start capacitor engineered for demanding HVACR applications, specifically to provide the necessary phase shift to initiate single-phase electric motor rotation. Rated for 233-292 MFD at 220/250VAC, this component is a drop-in replacement for failed capacitors in air conditioning compressors, refrigeration systems, and heat pumps. Built with a rugged, moisture-resistant phenolic resin case, it helps the motor overcome high-inertia loads and locked rotor amps issues by delivering a momentary current boost to the start windings. Using an electrolytic capacitor like the MARS 11953 ensures your compressor reaches 75% of its rated RPM quickly, allowing the potential relay to safely cycle the start circuit out of the loop. This JARD 11953 compatible model fits standard 1-13/16 inch diameter mounting brackets and features 1/4-inch quick-disconnect terminals for fast field replacement during service calls.

• High-capacitance 233-292 microfarad range provides superior starting torque for heavy-duty compressors.
• Dual voltage rating (220V/250V) offers versatility across various residential and commercial HVAC units.
• Hermetically sealed construction protects internal components from oil, grease, and high-humidity environments.
• Standard round dimensions (approx. 1.81" D x 3.38" H) ensure compatibility with existing motor housing and mounting hardware.
• Optimized for 50/60 Hz frequency to maintain consistent performance across different power grids.

How do I know if my start capacitor is bad?
Technicians typically check for a bulging top, leaking oil, or perform a capacitance test with a multimeter. If the compressor hums but fails to turn over, or if you notice a "hard start" condition with flickering lights, the MARS 11953 is the likely solution.

Can I use a capacitor with a higher voltage rating than my original?
Yes. You can always use a higher voltage capacitor (e.g., replacing a 220V with this 250V unit), but you must never use one with a lower voltage rating than the original specification.

What happens if the start capacitor stays in the circuit too long?
The start capacitor is strictly for intermittent duty. If the potential relay fails to kick it out of the circuit once the motor is at speed, the capacitor will overheat and fail. Always verify relay operation when replaces a blown start cap.

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.