MARS 11073 Start Capacitor

When you're dealing with demanding motor start applications, the MARS 11073 Start Capacitor delivers the high starting torque required to bring heavy-duty compressors and fan motors up to speed. This 850-1020 Microfarad component is engineered for 110/125Vac circuits and is a standard replacement for many HVACR and industrial pump systems. Built with a hermetically sealed black Bakelite case, the MARS 11073 is designed to protect internal film and foil against oil, dirt, grease, and moisture in harsh mechanical environments. Featuring 1/4 inch quick disconnect terminals, it allows for efficient field swaps, ensuring high-duty cycle performance and reliable motor ignition even under significant load.

Key Benefits

• High capacitance range of 850-1020 MFD ensures rapid motor acceleration.
• Rugged Bakelite housing provides superior insulation and protection from environmental contaminants.
• Universal compatibility with 125V electric motor start configurations and HVAC equipment.
• Compact round form factor simplifies mounting in crowded control boxes.
• UL and CUL recognized for consistent performance in professional service applications.

Common Questions

What is the difference between a start and a run capacitor?
A start capacitor like the MARS 11073 is designed for momentary use to provide a high-torque boost during the motor's starting phase and is typically switched out by a relay once the motor reaches about 75% of its rated speed. A run capacitor stays in the circuit continuously to maintain efficiency while the motor is operational.

How do I check the MARS 11073 for failure?
In addition to checking for physical bulging or leaking, use a multimeter with a capacitance setting. If the measured Microfarad value falls outside the 850-1020 range, or if the motor hums but fails to turn over, the capacitor should be replaced.

Can I use this to replace a capacitor with a different voltage rating?
You can replace a capacitor with one of a higher voltage rating (e.g., using a 125V unit for a 110V circuit), but never use a lower voltage rating than the original specification, as this will lead to immediate component failure.

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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.