The MARS 12253 is a professional-grade 50/12.5 MFD 440V dual run capacitor engineered for continuous duty in residential and light commercial HVACR systems. As a veteran technician knows, maintaining the correct microfarad rating is critical for motor torque and winding longevity. This round dual run capacitor supports both the AC compressor and the condenser fan motor, effectively replacing two separate components to save space within the electrical cabinet. Built to EIA-456-A standards, it features a non-PCB oil-filled dielectric and a pressure-sensitive interrupter for reliable fault protection. The 440 VAC rating provides a robust safety margin, allowing it to replace 370V units without issue while resisting the voltage spikes common in split-system air conditioners and heat pumps. With standard 1/4-inch male quick-connect terminals (C, HERM, FAN), this HVAC replacement part ensures straightforward integration during preventative maintenance or emergency AC repair calls. Precise capacitance tolerance of +/- 6% ensures consistent motor performance across a wide operating temperature range of -40°C to +70°C. Key Benefits Dual-Section Design: Consolidates 50 MFD and 12.5 MFD requirements into a single round aluminum case, simplifying wiring and fitment in tight OEM brackets. Enhanced Durability: The 440V AC rating handles high-stress environments better than standard 370V counterparts, reducing callbacks due to premature failure. Safety Integrated: Incorporates an internal pressure-sensitive interrupter designed to disconnect the capacitor if internal pressure builds, preventing case rupture. Broad Compatibility: Meets UL safety standards and EIA-456-A benchmarks, making it a suitable cross-reference for various 50+12.5 microfarad motor applications. Common Questions Can I use this 440V capacitor to replace a 370V model? Yes. In capacitor applications, you can always upgrade to a higher voltage rating, but you must never go lower than the original system specification. What do the C, HERM, and FAN markings mean? "C" is the common terminal, "HERM" connects to the compressor (hermetic) start winding, and "FAN" connects to the condenser fan motor. How do I know if my dual run capacitor is failing? Common indicators include a bulged or "mushroomed" top, oil leaks, or a microfarad reading outside the +/- 6% tolerance when tested with a multimeter. This item is not eligible for free shipping. 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.
