Run Start Capacitor, Round, 20/5 MFD, 440/370

HVAC Motor Support – Mars 12780 Dual Run Capacitor (20/5 MFD, 440V)

The Mars 12780 is a dual-section motor run capacitor engineered to support continuous-duty HVAC applications where both compressor and fan motors operate on a shared capacitor platform. With a 20/5 microfarad rating at 440 volts AC, it provides stable, energy-efficient support in split-phase motor circuits commonly found in residential and light commercial systems.

This round, metal-can capacitor is constructed to meet rigorous operating standards, including thermal and electrical endurance under load. Designed for professional use, the Mars 12780 provides a dependable solution for systems requiring dual capacitance values in a compact footprint. It is suitable for both OEM replacements and retrofit service scenarios.

Capacitor Performance Overview

• ✅ Dual-Value Support – 20 MFD for compressor circuits and 5 MFD for fan motor support in single-phase split capacitor systems.
• ✅ Rated at 440 VAC – Operates safely in environments with high line voltage fluctuation or extended duty cycles.
• ✅ Heavy-Duty Construction – Aluminum case with sealed terminals provides durability against vibration and thermal cycling.
• ✅ Round Profile – Designed for vertical mounting in standardized motor or equipment housings.

Technical Specifications

• Capacitance: 20/5 µF (microfarads)
• Rated Voltage: 440 VAC
• Case Type: Round metal can
• Terminals: Dual blade terminals for secure motor lead attachment
• Application: Dual motor support (e.g., compressor and condenser fan)

Installation Notes

Installation should be completed by a licensed HVAC technician. Ensure the correct terminal orientation (C, FAN, and HERM) to match motor wiring. All power should be disconnected prior to installation. Verify microfarad and voltage ratings to confirm compatibility with system specifications.

Professional Use Case

The Mars 12780 is frequently deployed in service truck inventories due to its compatibility with a range of common air conditioning and heat pump systems. It provides a field-ready solution for dual-run applications requiring compact form factor and reliable electrical stability under continuous operation.

Application & Design Considerations

• ✅ Compatible with OEM and aftermarket motor assemblies
• ✅ Non-PCB dielectric fluid for environmental compliance
• ✅ Meets UL and EIA standards for safety and performance

Conclusion

The Mars 12780 20/5 MFD 440V Dual Run Capacitor is engineered to deliver stable, high-efficiency motor operation in HVAC environments requiring dual capacitance. Designed with professional contractors in mind, it supports critical motor functionality in compressors and fans with dependable performance under load.