Mars 12901 – Dual Run Capacitor, 75/7.5 MFD, 440/370V, Round Can
The Mars 12901 dual run capacitor is engineered for use in HVAC applications requiring simultaneous support for both compressor and fan motor circuits. This unit combines two capacitors into one enclosure, reducing space and simplifying installation.
With a capacitance of 75/7.5 microfarads (µF) and a voltage rating of 440/370 VAC, it is suitable for continuous-duty operation in permanent split capacitor (PSC) motors. The round metal case is oil-filled and features a built-in pressure-sensitive interrupter for overpressure protection.
Specifications
Capacitance: 75 µF (compressor) / 7.5 µF (fan)
Rated Voltage: 440/370 VAC
Frequency: 50/60 Hz
Configuration: Dual run
Shape: Round
Case Material: Aluminum
Dielectric Fluid: Oil-filled, non-PCB
Safety Feature: Internal pressure interrupter
Operating Temperature: -40°C to +70°C
Terminals: Standard ¼" quick-connect
Application
Designed for PSC motors in residential and light commercial HVAC systems
Commonly used in outdoor condensing units
Supports both compressor and fan motor operation with a single component
Installation Notes
Ensure the replacement capacitor matches OEM specifications for voltage and capacitance. Always discharge the existing capacitor safely before removal. The Mars 12901 is intended for vertical or horizontal mounting and should be installed according to local code by a qualified technician.