Marathon
Marathon U351A - 20 HP, Dripproof, Frame 256JM
Model: U351A
Marathon U351A motor — 20 HP, 3-phase, 230/460 V, 3600 RPM, 256JM frame, ODP, 92.4% efficiency.
Technical Specifications
| Horsepower (HP) | 20 |
| Frame Size | 256JM |
| Enclosure | ODP |
| Full Load Speed (RPM) | 3600 |
| Voltage | 230/460 |
| Phase | 3 |
| Full Load Amps (A) | 47.0/23.4 |
| Weight (lbs) | 272 |
| IP Rating | IP43 |
| Category | Pump Motors |
| Electrical Type | AC Induction |
| Rotation | CW/CCW |
| Frequency | 60 |
| Efficiency (%) | 92.4 |
| Shaft Diameter | 1.625 |
| Shaft Diameter Source | NEMA MG-1 frame table |
| Mounting Type | Close-Coupled Pump |
| Mounting Type Source | Marathon 2026 Catalog p.113 |
| Duty Type | Pump |
Manufacturer
Marathon
A Regal Rexnord brand manufacturing industrial-grade electric motors. Known for Blue Chip XRI, Black Max, and severe duty product lines.
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