Mars 12281 Dual Run Capacitor 30/5 MFD 440V Round Blue Box

The Mars 12281 is a dual section round motor run capacitor rated at 30/5 MFD and 440/370 VAC, part of the trusted MARS Blue Box series. Designed for single-phase HVAC and refrigeration equipment, this capacitor supports both the compressor and fan motor simultaneously in a single compact round housing — eliminating the need for two separate capacitors.

Key Features:

• Dual section design: 30 MFD (compressor) + 5 MFD (fan motor) in one unit
• Voltage rating: 440/370 VAC — compatible with both 370V and 440V applications
• Frequency: 50/60 Hz universal rating
• Operational life: 60,000 hours rated
• Temperature range: -40°C to +70°C (-40°F to +158°F)
• Case height: 3.875 in. | Overall height: 4.375 in. | Base diameter: 2.00 in.
• Terminals: 4, 3, and 2 terminal configurations supported
• Composition: Aluminum construction
• Environmentally safe: Non-PCB formula with physical interrupter safety device
• Certifications: UL and CSA Listed

The MARS Blue Box series is a benchmark in HVAC/R reliability, offering one of the widest ranges of capacitor ratings in the industry. The Mars 12281 is a direct replacement dual run capacitor suitable for air conditioners, heat pumps, and condenser units requiring a 30/5 MFD round-style capacitor.