Marathon Electric X503 Condenser Fan Motor - 3 ph, 1-1/2 hp, 1200 rpm, 200-230/460 V, 56Y Frame, OAO (Open Air-Over) Enclosure, 60 Hz

Key features

• THREE-PHASE CONDENSER FAN AND HEAT PUMP MOTOR: Marathon X503, model 056T11O5303. 1-1/2 HP, 1140 RPM nameplate on a 6-pole design, 200-230/460 volt 3-phase 60 Hz, 56Y frame, Open Air Over enclosure.
• PHYSICAL FIT: 5/8 in (0.625) shaft, 5 in long, with flat and keyway. 16.06 in overall length, 8.56 in shell, round belly band footless mount, hubs both ends take resilient bases, 6203 ball bearings.
• VERIFY YOUR POWER FIRST: this is a THREE-PHASE motor and will not run on single-phase. Confirm three-phase 200-230V or 460V at the disconnect, then match 56Y frame, 5/8 in shaft and 1140 RPM.
• AIR-OVER ONLY: it must be mounted in the fan airstream to cool itself, so never run it in still air. Built for outdoor condenser fan and heat pump duty on units 5 tons and larger. 70C ambient rating.
• WHAT SHIPS: one Marathon X503 motor, nothing else. No capacitor is included, and a three-phase motor of this type needs no run or start capacitor. Fan blade, band and wiring are not supplied.

The Marathon Electric X503 is a three-phase condenser fan and heat pump motor built for outdoor commercial air conditioning and heat pump service. Marathon publishes it as catalog number X503 with model number 056T11O5303, so both numbers describe the same motor and either one may appear on the tag you are replacing. Phase is the single most important thing to check. This motor is wired for three-phase power at 200-230 volts or 460 volts, 60 Hz. It will not operate on a single-phase supply, so confirm three-phase service at the unit disconnect before you order. Full-load current is 5.5 amps at 200 volts, 5.4 amps at 230 volts and 2.7 amps at 460 volts, which is what you size the branch breaker and the overload heaters against. Output is 1-1/2 horsepower with a nameplate speed of 1140 RPM from a six-pole winding, which some catalogs and tags print as the 1200 RPM nominal speed. The motor uses a 56Y frame with a 5/8 inch diameter by 5 inch shaft with a flat and keyway, a round belly band footless mount, and 6203 ball bearings at both ends. The enclosure is Open Air Over, which means the motor is cooled by the air the fan moves across it and must be installed inside that airstream. In

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