Mars Blue Box Motor Run Capacitor, 30/4 MFD, Dual Section 440/370 Volt Round (12120)

About the Mars Blue Box Motor Run Capacitor, 30/4 MFD, Dual Section 440/370 Volt Round (12120)

Buy now to get a deal on the Mars 12120 Dual Motor Run Capacitor, 30/4 MFD, 440V, Round with the pros at PlumbersStock. Motor run capacitors alter the current, creating a rotating magnetic field in single-phase induction motors. This Blue Box series has a reputation for producing the most reliable motor run capacitors. The initials MFD stand for Microfarad (a millionth of a Farad), which is a measurement of the capacitor's capacity. Mars is a popular HVAC brand among both homeowners and contractors for good reason.