The Allstar 005021 is an OEM motor start capacitor rated at 53–64 MFD and 250 VAC for 1/3 HP single-phase motors. Commonly used in Allstar garage door and gate operators, this capacitor provides the phase shift and starting torque needed to bring the motor up to speed quickly and reliably. It serves as a direct replacement part for openers that specify 53–64 microfarads at 250 volts, helping restore dependable lift performance in residential and light commercial applications.
When installing this replacement capacitor, disconnect power, follow the operator’s wiring diagram, and ensure the microfarad and voltage ratings match the original component (voltage may be equal or higher, never lower). This AC start capacitor is intended for intermittent duty during motor startup; if the opener struggles to start, hums, or trips protection, a worn start capacitor is a common cause. Compatible with Allstar operators that call for 005021 or equivalent 53–64 MFD, 250V, 1/3 HP specifications, it’s a practical fix for garage door opener and gate operator maintenance where a like-for-like start capacitor is required.