MARS 11948 Start Capacitor

The MARS 11948 Start Capacitor is a heavy-duty field replacement engineered for single-phase motor applications requiring a high-torque boost during the start cycle. Rated for 124-156 MFD at 250VAC (compatible with 220V systems), this electrolytic round start capacitor provides the necessary phase shift to overcome locked rotor amperage (LRA) in HVAC compressors and fan motors. Encased in a rugged, moisture-resistant phenolic resin case, the 11948 is built to withstand the high temperatures and electrical stress common in peak-load environments. The MARS 11948 features standard 1/4-inch quick-connect terminals for secure electrical contact and rapid installation. When technicians are troubleshooting HVAC capacitors or performing routine maintenance, ensuring the capacitance range matches the OEM motor specifications is critical for preventing winding overheating. This start capacitor 250V unit is a reliable solution for restoring efficiency to older mechanical systems where torque demand has increased over time.

• Universal Compatibility: Fits various single-family residential and light commercial HVAC equipment calling for 124-156 microfarad ratings.
• High Temperature Tolerance: Designed to operate reliably in high-ambient conditions without premature ESR (Equivalent Series Resistance) failure.
• Industrial Build: Phenolic housing prevents environmental degradation and protects internal electrolytic capacitor components.
• Efficient Torque Delivery: Optimizes motor startup speeds to reduce mechanical wear and energy consumption during the initial cycle.

Common Technical Questions

What happens if I use a higher MFD rating? Using a capacitor with a higher MFD than specified can cause the motor windings to draw excessive current, leading to overheating and potential insulation failure. Always stay within the 124-156 MFD range for the MARS 11948.

Is the voltage rating cross-compatible? Yes, a 250VAC rated capacitor can safely replace a 220VAC unit. The voltage rating on a start capacitor indicates the maximum surge it can handle; never use a capacitor with a lower voltage rating than the original equipment.

How do I test a MARS 11948 start capacitor? Use a multimeter with a capacitance setting. After discharging the capacitor safely, measure across the terminals to ensure the reading falls within the 124 to 156 microfarad tolerance. If it is significantly lower or shows an open circuit, it requires replacement.

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.