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Home > Electric Motors > Discontinued Electric Motors > MARATHON Discontinued AC Motors > 20HP MARATHON 3600RPM 256JM TEFC 230/460V 3PH MOTOR U351

20HP MARATHON 3600RPM 256JM TEFC 230/460V 3PH MOTOR U351

MARATHON U351 has been superseded by U351A

Catalog Number: U351
Model Number: 256TTFL4006
Description: 20HP,3600RPM,256JM,TEFC,230/460V,3PH,60/50HZ
Ship Weight:  232 lbs.

This Marathon Motor Can Only Ship Ground Freight
For expedited needs please contact our sales team

APPLICATIONS: Close-coupled pump where the pump impeller is mounted directly on the
motor shaft in environments that are relatively clean and dry.

  • Aluminum Frame Construction
  • NEMA JM pump shaft dimensions
  • 1.15 Service Factor
  • Ball bearings, mechanically locked on shaft end
  • Continuous duty
  • UL Recognized, CSA Certified
  • Rated 60/50 hertz, 190/380 or 380 volt at next lower horsepower
  • Footnotes: AL, 68

This product must be installed and serviced by a qualified technician, electrician, or electrical maintenance person familiar with its operation and the hazards involved. Proper installation, which includes electrical connections, fusing or other current protection, and grounding, can reduce the chance of electrical shocks, and fires, in this product or products used with this product, such as electric motors, switches, coils, solenoids, and relays. Do not use this product in an explosion-proof application.

Phase 3 Insulation Class F
Frame 256JM Duty CONTINUOUS
Enclosure TEFC Ambient 40
Mounting C-Face Rigid NEMA Design B
Orientation HORIZONTAL Starting Type ACROSS THE LINE
Assembly F1 (F2 Modification Available) KVA Code G
Drive End Bearing BALL IP Code 43
Opposite End Bearing BALL    
Drive End Bearing Size 6309    
Opposite End Bearing Size 6207    
Weight 232 LB lbs    
CE Y CSA Y
UL Recognized Construction
Thermal Protection  
20HP MARATHON 3600RPM 256JM TEFC 230/460V 3PH MOTOR U351
Click Image to Enlarge
Image for quick reference only
Manufacturer Part Number: U351
Stock # U351

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