If your RV air conditioner hesitates, trips the breaker on startup, or struggles to kick on when running from a generator or smaller shore power pedestal, a hard start capacitor is the fix. The Dometic 3311883.000 is the OEM-specified hard start capacitor for Dometic 11,000 and 13,500 BTU rooftop AC units. It uses a 3-wire electronic potential relay to deliver a controlled burst of extra starting torque to the compressor motor, getting the unit running faster, more reliably, and with significantly less electrical stress on every start cycle.
RV air conditioner compressors are among the highest-draw appliances in any rig. At startup, a compressor can momentarily pull 3 to 5 times its running amperage -- often 40 to 60 amps for a fraction of a second. On a 30-amp service, a weak generator, or a long extension cord with voltage drop, that inrush current can prevent the compressor from reaching full speed before the thermal protector or breaker trips. The result is a unit that cycles off immediately, makes a hard clicking sound, or fails to start at all.
The Dometic 3311883.000 solves this by adding a start capacitor and a 3-wire electronic potential relay in series with the compressor start winding. The capacitor provides the extra phase shift needed to boost starting torque, and the relay drops it out of the circuit once the compressor reaches running speed -- protecting the capacitor from continuous voltage and preventing overheating. The net result is a faster, cleaner compressor start that draws less peak current from your power source.
Designed and specified by Dometic for 11,000 and 13,500 BTU rooftop units. Plug-and-play installation with no modifications to the AC control board.
Potential relay drops the start capacitor out of circuit once the compressor reaches operating speed, preventing capacitor overload and extending component life.
Lower peak inrush current during every start cycle means less stress on the compressor windings, run capacitor, and your RV's electrical system.
Helps the AC start successfully on smaller generators (typically 2,800W and up), 30-amp pedestals with voltage sag, or when multiple appliances share a circuit.
This is a targeted fix for specific, recognizable symptoms. If you're experiencing any of the following, the 3311883.000 is worth installing before replacing more expensive components:
The 3311883.000 installs inside the AC unit's electrical compartment, wired in parallel with the existing run capacitor and in series with the compressor start winding terminal. The 3-wire electronic relay mounts nearby. No new holes, no control board changes, and no new wiring harnesses are required. A standard multimeter and basic hand tools are all that's needed for most RV owners comfortable working in a 120V AC compartment.
This capacitor is specified for Dometic (formerly Duo-Therm) rooftop air conditioners in the 11,000 BTU and 13,500 BTU ranges. It is commonly used with the Brisk Air, Brisk Air II, and Penguin II series. If your unit is a Dometic or Duo-Therm rooftop AC in those BTU classes and the part number cross-references to 3311883.000, this is the correct capacitor.