Mars 12928 – 4 MFD Oval Run Capacitor, 440V
The Mars 12928 is a single-value motor run capacitor designed for use in HVAC applications requiring 4 microfarads (µF) of capacitance at 440 volts AC. Housed in a compact oval aluminum case, it is well-suited for blower motors, fan motors, or other low-capacitance continuous-duty applications in air conditioning and ventilation systems.
Technical Specifications:
Capacitance: 4 µF (±6%)
Voltage Rating: 440 VAC
Frequency: 50/60 Hz
Operating Temperature Range: -40°C to +70°C
Case Style: Oval
Construction: Metallized polypropylene film
Terminals: Quick-connect
Non-PCB: Yes
Safety Feature: Pressure-sensitive internal interrupter
Product Features:
Rated for continuous operation in single-phase motor applications
Oval aluminum housing for efficient installation in space-constrained units
Designed to meet UL and EIA standards for run capacitors
Suitable for use in both residential and light commercial HVAC systems
Stable electrical output under high-load and variable thermal conditions
Application Considerations:
This component is appropriate for replacing existing 4 µF capacitors in systems operating at 440V. Verify compatibility with OEM specifications before installation. Always de-energize equipment and discharge stored voltage prior to service. Use appropriate PPE and adhere to local electrical code requirements. Recommended for installation by trained HVAC professionals.