MARS 11966 Start Capacitor

The MARS 11966 Start Capacitor is a high-torque solution for single-phase motor applications requiring a 145-175 MFD range. Rated for 330VAC and designed with a 50/60 Hz frequency rating, this round electrolytic capacitor provides the necessary current burst to overcome initial inertia in compressors and motors. Built with a rugged, hermetically sealed black bakelite (phenolic) case, the MARS 11966 is protected against oil, moisture, and dirt, making it ideal for the demanding environments of HVACR systems, including air conditioners, heat pumps, and water pumps. Measuring 1-13/16 inches in diameter and 4-3/8 inches in height, it fits standard mounting brackets. For optimal field performance, technicians should ensure compatibility with existing relays or contactors and verify the presence of a bleed resistor if the application requires rapid discharge to protect relay contacts. This HVAC motor start capacitor is a reliable choice for replacing worn components to prevent locked-rotor conditions and winding damage.

• High Torque Starting: Delivers a 145-175 microfarad boost to assist compressors in starting under heavy loads or unequalized pressures.
• Durable Bakelite Housing: The 11966 features a non-conductive phenolic case that resists grease and environmental contaminants.
• Wide Temperature Range: Operates efficiently in environments ranging from -40°C to 65°C (-40°F to 149°F).
• Industry Standard Terminals: Equipped with dual 1/4-inch male quick-connect terminals for fast and secure field wiring.
• Universal Compatibility: Replaces common industry part numbers such as 11066, B1104806, and 43-17075-11.

Can I use the MARS 11966 to replace a capacitor with a different MFD rating?
It is critical to match the MFD rating. Utilizing a capacitor with a lower rating may prevent the motor from starting, while a significantly higher rating can cause the motor windings to overheat. Always use the 145-175 MFD range if specified by the manufacturer.

Does this capacitor include a bleed resistor?
While many MARS series capacitors are designed for use with potential relays, you should verify if your specific application requires a 15,000-18k ohm bleed resistor to prevent arcing across relay contacts during discharge.

How do I know if my 145-175 MFD 330V capacitor has failed?
Visual indicators include a blown-out top membrane or leaking fluid. Technically, you should use a multimeter with a capacitance setting to confirm the MFD is within the +/- 20% tolerance of the 145-175 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.