Leeson

Three-phase 50 Hz AC motors don’t require starting capacitors, run capacitors, or centrifugal starting switches that can wear out and fail. They operate with a higher torque and greater efficiency than single-phase 50 Hz motors of the same HP, rpm, and frame size.

Capacitor-start instant reverse AC motors use a capacitor to provide additional power during startup for higher torque and better efficiency compared to split-phase motors. They have an open dripproof (ODP) enclosure with ventilation openings in the endshields and shell placed so drops of liquid falling within 15? from vertical will not affect motor performance.