Marathon 20 HP Close-Coupled Pump Motor, 3 phase, 1800 RPM, 230/460 V, 256JMV Frame, ODP - U100

Catalog #:U100
Part #:256TTDX4041
  • NEMA JM pump shaft dimensions
  • JMV frame includes drip cover for vertical mount without base
  • JM frame has rigid base, drip cover not included
  • Ball bearings, mechanically locked on shaft end
  • Continuous duty
  • 1.15 Service Factor
  • UL Recognized and CSA Certified
  • UL Listed for Fire Pump applications (except as noted)
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Weight:196.00 LB

General Specifications

UPC: 722856033765 Weight: 196.00 LB
Packaged Length: 30.5 IN Packaged Width: 16.81 IN
Packaged Height: 14.75 IN

Nameplate Specifications

Output HP: 20 Hp Output KW: 14.9 kW
Frequency: 60 Hz Voltage: 230/460 V
Current: 50.0/25.0 A Speed: 1750 rpm
Service Factor: 1.15 Phase: 3
Efficiency: 91 % Power Factor: 82.5
Duty: Continuous Insulation Class: B
Design Code: B KVA Code: F
Frame: 256JMV Enclosure: Drip Proof
Thermal Protection: No Ambient Temperature: 40 °C
Drive End Bearing Size: 6309 Opp Drive End Bearing Size: 6208
UL: Recognized CSA: Y
CE: Y IP Code: 12

Technical Specifications

Electrical Type: Squirrel Cage Induction Run Starting Method: Across The Line
Poles: 4 Rotation: Reversible
Resistance Main: .48 Ohms Mounting: Round
Motor Orientation: Shaft Down Drive End Bearing: Ball
Opp Drive End Bearing: Ball Frame Material: Rolled Steel
Shaft Type: JM Overall Length: 25.45 in
Frame Length: 15.15 in Shaft Diameter: 1.25 in
Shaft Extension: 5.28 in Assembly/Box Mounting: F1/F2 Capable

Speed Characteristics

Curvepoint Current (Amps) Current (%) Torque (ft-lbs) (%) Speed (RPM) Rated Output (KW) Power Factor (%) Rated Output (Hp)
Locked-Rotor 142.00 568.0 123.00 205.0 0 43.0 20.00
Full Load 25.00 100.0 60.00 100.0 1,750 20.00
2/3 100.00 400.0 125.00 208.0 1,200 20.00
No Load 9.50 38.0 0.00 0.0 1,800 20.00
1/3 130.00 520.0 110.00 183.0 600 20.00
Pull-Up 120.00 480.0 115.00 192.0 900 20.00
Break-Down 80.50 322.0 145.00 242.0 1,575 69.0 20.00

Load Characteristics

% of Rated Load 0 % 25 % 50 % 75 % 100 % 115 % 125 %
Current (Amps) 9.50 11.00 14.50 19.50 25.00 29.00 31.50
Rated Output (KW) 0.50 4.20 8.20 12.20 16.50 19.00 21.00
Efficiency (%) 0.0 90.2 92.4 91.7 91.0 90.2 89.5
Power Factor (%) 4.5 48.0 69.5 79.0 82.5 83.0 83.5
Speed (RPM) 1,800 1,788 1,775 1,765 1,750 1,740 1,730
Temp. Rise @ FL 0.0 0.0 0.0 0.0 65.0 85.0 105.0
Torque (ft-lbs) 0.00 14.80 29.50 44.50 60.00 69.00 75.50
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