MARS 11922 Start Capacitor

The MARS 11922 Start Capacitor is a heavy-duty, electrolytic component engineered for HVAC motor starting applications requiring a high torque boost during the initial power phase. Rated for 340-408 MFD (microfarads) at 110/125VAC, this round start capacitor is designed to provide the necessary phase shift to initiate rotation in single-phase electric motors and compressor motors. Constructed within a rugged, moisture-proof phenolic resin case, the 11922 is built to withstand the demanding thermal cycles typically found in refrigeration systems and air conditioning units. The dual quick-connect terminals allow for rapid field replacement and secure wiring. For technicians performing capacitor troubleshooting, this unit serves as a direct replacement for various OEM components in commercial and residential equipment where motor torque enhancement is critical to prevent locked rotor conditions and ensure efficient startup cycles under high head pressure.

Technical Specifications & Key Benefits

• Universal Compatibility: Optimized for use in 110V and 125V systems requiring 340-408 MFD capacitance.
• Industrial Build: Encased in a non-conductive, corrosion-resistant phenolic housing to prevent electrical leakage and handle high ambient temperatures.
• High Torque Support: Provides the high reactive power needed for PSC motor and capacitor start motor applications.
• Standardized Form Factor: Fits standard round start capacitor mounting brackets for streamlined installation.
• Reliable Discharge: Designed to cycle out of the circuit via a centrifugal switch or start relay once the motor reaches operating speed.

Common Technical Questions

Can I use a 340-408 MFD capacitor if my original is rated for 370 MFD?
Yes, the 340-408 MFD range covers the common 370 MFD requirement. As long as the voltage rating meets or exceeds the original (110/125VAC) and the capacitance range overlaps, it is an appropriate HVAC replacement part.

What causes a start capacitor like the MARS 11922 to fail?
Failure is typically caused by excessive heat, aged motor windings causing high amperage draws, or a faulty start relay that keeps the capacitor in the circuit too long. If the top of the casing is bulged, the motor start capacitor needs immediate replacement.

Is the polarity important when wiring this capacitor?
No, round start capacitors for AC motor applications are non-polarized. You can connect the leads to either terminal without affecting performance.

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.