MARS 11918 Start Capacitor

The MARS 11918 Start Capacitor is a high-torque electrical component engineered to provide the necessary phase shift to initiate electric motor startup across residential and light commercial HVACR systems. Rated at 233-292 MFD (microfarads) with a 110/125VAC capacity, this electrolytic capacitor is specifically designed for 115V fractional horsepower motors and compressors requiring a high initial starting torque. Its round electrolytic design features a hermetically sealed, non-conductive black bakelite case that protects the internal capacitive elements from oil, moisture, and debris commonly found in control cabinets.

As a veteran's choice for field replacements, the MARS 11918 offers a standardized compact footprint, measuring 1-3/8 inches in diameter and 2-3/4 inches in height. This makes it a direct motor start capacitor replacement for various OEM brands, ensuring compatibility with primary HVAC blowers and light-duty compressors. The 233-292 uF range provides the precise discharge required to bring motors up to speed quickly, reducing the duration of high-inrush current and protecting the motor windings from excessive thermal stress during the start cycle.

Key Benefits for Technicians:

• Strong starting torque for 110/125V motors prevents stalls and hard starts.
• Durable phenolic case construction resists environmental degradation.
• Standardized 1/4-inch quick connect terminals facilitate fast, multi-configuration wiring.
• Wide operating temperature range of -40°C to 65°C ensures stability in extreme attic or rooftop environments.
• Trusted HVAC start capacitor specifications compatible with leading motor manufacturers.

Common Questions:

Can I use a 125V start capacitor on a 110V circuit?
Yes. The 110/125VAC rating indicates the maximum peak voltage the capacitor can handle. It is perfectly safe and standard to use this 233-292 MFD 125V capacitor on a 110V or 115V motor application.

How do I know if my start capacitor is bad?
Look for physical signs such as bulging, leaking fluid, or a popped top. Technically, if the motor hums but fails to turn, or if an MFD test shows a reading below the 233 microfarad minimum, a replacement is necessary to prevent motor burnout.

Does this replace a run capacitor?
No. A start capacitor like the MARS 11918 is designed for short-duty cycles to kickstart the motor. It must be paired with an appropriate potential relay or centrifugal switch to be removed from the circuit once the motor reaches roughly 75% speed.

This item is not eligible for free shipping.

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.