MARS 11042 Start Capacitor

The MARS 11042 is a professional-grade 43-56 MFD 220/250Vac round start capacitor engineered for reliable motor-starting torque in demanding HVACR applications. Designed with a hermetically sealed phenolic case (Bakelite), this 110 series component provides an air-tight barrier against oil, moisture, and debris, ensuring long-term dielectric stability for single-phase motors. The 11042 features an improved terminal design capable of withstanding the high-heat cycles typical of AC compressor start-up and heavy-duty fan motor applications in humid environments.

For the service technician, its compact 1-7/16 inch diameter and 2-3/4 inch height make it one of the most versatile HVAC universal replacement capacitors for tight electrical cabinets. Rated for 40 starts per hour at 50/60 Hz, it provides the precise microfarad range needed to boost the locked rotor amperage (LRA) of fractional horsepower motors, making it a staple for stock on any service truck.

• Extreme Durability: The black Bakelite housing is non-conductive and resists corrosion in severe mechanical room conditions.
• Universal Compatibility: Exact replacement for most 43-56 microfarad start applications, reducing the need for multiple truck stock items.
• High-Heat Terminals: Dual-blade terminals are engineered to minimize heat generation under heavy electrical loads.
• Made in the USA: Built to rigorous industry standards, ensuring consistent capacitance within the specified ±20% tolerance.

• Can I use this to replace a capacitor with a lower voltage rating? Yes, the 250V rating is upwardly compatible with 110V or 165V systems, provided the microfarad (MFD) range matches.
• How do I identify a failing start capacitor? Look for physical bulging, leaking electrolyte, or a motor that hums without turning over, indicating the start winding is not receiving the necessary phase shift.
• Is a bleed-resistor required? While not always pre-installed, a resistor may be needed for specific potential relay configurations to prevent arcing and protect the relay contacts.

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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.