When your Dometic B5 series rooftop air conditioner struggles to start or runs poorly, a failed run capacitor is one of the most common culprits. This genuine Dometic replacement capacitor (part 3312195.000) restores proper motor operation to your compressor and fan motor circuits -- getting your rig cool again without a costly service call.
The 3312195.000 is the correct OEM run capacitor for several Dometic B5 series air conditioner models. Run capacitors remain in circuit continuously during operation, supplying the phase shift current that keeps compressor and fan motors running efficiently. A weak or failed capacitor causes hard starts, reduced cooling output, overheating, and eventual motor burnout if left unaddressed.
This is a drop-in replacement -- same mounting footprint, same electrical rating, same terminal configuration as the original. No modifications or adapters required for the listed compatible models.
Rated 60/5 MFD -- matches the dual-section rating of the original Dometic factory capacitor for compressor and fan motor circuits.
Body measures 2-1/2 inches in diameter x 3-7/8 inches tall. Total height including terminals is 4-1/4 inches -- fits the original mounting bracket.
Confirmed for models 57915.741, B595146, B59146, B59186, and B59196. Check your existing unit label before ordering.
Backed by Dometic's limited 90-day warranty against defects in materials and workmanship.
Unlike a start capacitor (which is only in circuit briefly during motor startup), a run capacitor stays energized the entire time the AC is running. This continuous duty cycle causes gradual capacitance loss over time -- especially in rooftop RV units that experience wide temperature swings, road vibration, and high ambient heat. Typical signs of a failing run capacitor include:
Replacing a run capacitor is a moderate DIY repair. The AC shroud must be removed to access the capacitor compartment. Always discharge the old capacitor before handling -- capacitors can hold a lethal charge even with power off. Photograph the original wiring before disconnecting terminals, as the dual-section (60/5 MFD) capacitor has three or more terminals that must be reconnected correctly.