MARS 11946 Start Capacitor

The MARS 11946 motor start capacitor is a field-proven 108-130 MFD 250V component designed to provide the high starting torque necessary for single-phase motors in HVACR systems. Built for intermittent duty, this round start capacitor facilitates rapid motor acceleration to prevent winding overheating. The non-polarized electrolytic design features a rugged phenolic resin housing, making it a drop-in replacement for standard AC motor start capacitors in heavy-duty compressors and fan motors. Technical specifications confirm a voltage rating of 220/250VAC at 50/60Hz, ensuring compatibility with standard commercial and residential power supplies. When diagnosing a motor failure to start, checking the microfarad rating and physical condition of the starting capacitor is priority one. The 11946 is engineered for long-term reliability under high-cycle conditions, providing the phase shift required for efficient motor operation.

Key Benefits for Contractors:

• Universal Compatibility: Fits standard brackets for 108-130 MFD start capacitor replacements.
• High Torque Output: Optimized for compressor start assistance in high-head pressure environments.
• Durable Construction: Moisture and oil-resistant phenolic case maintains integrity in demanding mechanical rooms.
• Industry Standard Terminals: Equipped with dual blade terminals for fast, secure wiring.
• Broad Temperature Range: Rated for reliable performance across standard HVAC operating environments.

Common Technical Questions:

Can I use a 250V capacitor to replace a 220V unit?
Yes, you can always increase the voltage rating, as long as the MFD rating remains within the original equipment manufacturer's specification. A 250V rating provides a higher safety margin for the dielectric material.

What causes a 108-130 MFD capacitor to fail prematurely?
Repeated short-cycling or a faulty potential relay that fails to take the start capacitor out of the circuit within seconds will lead to rapid failure and venting.

How do I verify the capacitance of the MARS 11946?
Use a multimeter with a capacitance setting. Ensure the capacitor is fully discharged before testing to protect your equipment and ensure an accurate reading within the 108-130 uF 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.