Verified specifications
| Horsepower | 1-1/2 HP |
|---|---|
| Speed | 1140 RPM (6-pole) |
| Voltage | 200-230/460V (VCD voltage-change device) |
| Phase | Three-phase |
| Frequency | 60/50 Hz |
| Frame | 56Y |
| Enclosure | Open Air Over (OAO) |
| Full-load amps | 5.5-5.4/2.7 A |
| Mounting | Round belly band / resilient ring |
| Shaft | 5/8 in. dia. x 5 in. long, with flat and keyway |
| Bearings | Double-sealed ball bearings |
| Rotation | Reversible |
| Thermal protection | Automatic reset thermal protector |
| Max ambient | 70°C |
| Marathon model number | 056T11O5303 |
| Weight | 35 lb (catalog) |
| Certifications | UL Recognized, CSA Certified |
Open-air-over (OAO) motors are cooled by the fan's own airstream — the X503 must be mounted in the airstream to run at rated load.
Do not confuse with the X503-P (model 056T11O15570), a separate 56Z-frame variant — check the frame on your nameplate.
Confirming the right replacement
Before we quote, compare these fields on your failed motor's nameplate. If any of them differ, send us a photo of the nameplate and we'll match it exactly rather than guessing:
- Full model number — including any suffix letters
- HP, RPM, and voltage
- Frame size (e.g. 284T) and enclosure (TEFC, ODP, etc.)
- Full-load amps
Other Marathon models
- More Marathon modelsBrowse every Marathon model page we quote
- Marathon X5021 HP, 1140 RPM, 200-230/460V 3-phase OAO condenser fan, 56Y belly-band
- Marathon X5092 HP, 1140 RPM, 208-230/460V 3-phase OAO condenser fan, 56Y belly-band
Need a Marathon X503?
Send the nameplate off your failed unit. We'll confirm the match and quote the X503 or a verified equivalent with availability and lead time.
Quote this motor