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

Mars 12780 – 20/5 MFD, 440V Dual Section Round Motor Run Capacitor The Mars 12780 is a dual-value motor run capacitor rated for 20 and 5 microfarads (MFD) at 440 volts AC. This component is used in HVAC systems to support continuous-duty operation of two separate windings—typically a compressor and fan motor—in permanent split capacitor (PSC) applications. The unit features a metallized polypropylene dielectric housed in a round aluminum case. It is hermetically sealed and includes a pressure-sensitive interrupter for internal fault protection. Designed for durability and consistent performance under load, this capacitor complies with UL and RoHS standards. Technical Specifications Capacitance: 20/5 MFD (±5%) Voltage Rating: 440 VAC Frequency: 50/60 Hz Case Style: Round aluminum shell Dielectric Type: Metallized polypropylene film Construction: Oil-filled, non-PCB, hermetically sealed Safety Feature: Internal pressure-sensitive interrupter Operating Temperature Range: -40°C to +70°C Terminals: ¼" male quick-connect blades (dual section) Certifications: UL recognized, RoHS compliant Application Overview Suitable for PSC motor circuits in air conditioning and refrigeration systems Supports two motor windings with a single capacitor unit Commonly used in condenser units with both fan and compressor loads Compatible with most standard mounting brackets and enclosures Installation Considerations Match both microfarad values and voltage rating exactly to system specifications Disconnect power and discharge capacitor before handling or replacement Secure capacitor using proper mounting and terminal connections Installation should be performed by qualified personnel to ensure safety and compliance with electrical codes