The LiftMaster 30B363 Capacitor (53–64 MFD) is a genuine OEM start capacitor for select LiftMaster and Chamberlain AC‑motor garage door openers and gate operators. This component delivers the temporary electrical boost a single‑phase motor needs to start and reach operating speed, helping restore proper starting torque and consistent performance when symptoms such as humming, stalling, or sluggish starts appear.
Use this replacement part when your operator’s manual or parts diagram specifies 30B363 or a 53–64 microfarad (MFD/µF) start capacitor. Installation generally involves transferring the two capacitor leads according to the unit’s wiring diagram; always disconnect power first, follow lockout/tagout practices, and note that capacitors can retain a charge. For safety and reliability, a qualified technician should perform the swap and verify operation on compatible LiftMaster residential or commercial operators that call for this capacitor value.