Marathon 20 HP General Purpose Pump Motor, 3 phase, 1800 RPM, 230/460 V, 256 Frame, TEFC - U2155A

Catalog #:U2155A
Part #:256TTFNA16942
  • Class F insulation
  • 50Hz Voltages at next lower HP
  • Rolled Steel and Cast Iron
  • NEMA Design B
  • 10:1 Constant Torque
  • 1.15 Service Factor on sinewave or 1.0 Service Factor on IGBT power
  • 254TYZ and larger frames IP55 Standard with (IP-56 as a factory modification)
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Weight:453.00 LB

General Specifications

UPC: 722856054531 Weight: 453.00 LB
Packaged Length: 39 IN Packaged Width: 32.25 IN
Packaged Height: 22.01 IN

Nameplate Specifications

Output HP: 20 Hp Output KW: 14.9 kW
Frequency: 60 Hz Voltage: 230/460 V
Current: 48.0/24.1 A Speed: 1775 rpm
Service Factor: 1.15 Phase: 3
Efficiency: 93 % Power Factor: 84
Duty: Continuous Insulation Class: F
Design Code: B KVA Code: G
Frame: 256 Enclosure: Totally Enclosed Fan Cooled
Thermal Protection: No Ambient Temperature: 40 °C
Drive End Bearing Size: 6312 Opp Drive End Bearing Size: 6210
UL: Recognized CSA: Y
CE: Y IP Code: 55

Technical Specifications

Electrical Type: Squirrel Cage Inverter Rated Starting Method: Line Or Inverter
Poles: 4 Rotation: Reversible
Resistance Main: .474 Ohms Mounting: Rigid Base
Motor Orientation: Horizontal Drive End Bearing: Ball
Opp Drive End Bearing: Ball Frame Material: Cast Iron
Shaft Type: Hyd Pump Adaptor Shaft Overall Length: 23.09 in
Frame Length: 12.25 in Shaft Diameter: 1.75 in
Shaft Extension: 4 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)
2/3 105.00 436.0 115.00 194.0 1,200 20.00
Pull-Up 115.00 477.0 100.00 169.0 900 20.00
Full Load 24.10 100.0 59.20 100.0 1,775 20.00
Break-Down 86.00 357.0 146.00 247.0 1,625 66.0 20.00
No Load 8.50 35.0 0.00 0.0 1,800 20.00
Locked-Rotor 138.00 573.0 105.00 177.0 0 40.0 20.00
1/3 125.00 519.0 90.00 152.0 600 20.00

Load Characteristics

% of Rated Load 0 % 25 % 50 % 75 % 100 % 115 % 125 %
Current (Amps) 8.50 10.50 14.00 18.50 24.10 27.00 30.00
Rated Output (KW) 0.60 4.00 8.00 12.00 16.00 18.00 20.50
Efficiency (%) 0.0 90.0 93.0 93.6 93.0 92.4 91.7
Power Factor (%) 8.5 51.0 72.0 81.0 84.0 84.5 85.0
Speed (RPM) 1,800 1,795 1,785 1,780 1,775 1,770 1,760
Temp. Rise @ FL 0.0 0.0 0.0 0.0 65.0 85.0 105.0
Torque (ft-lbs) 0.00 14.50 29.50 44.50 59.20 68.00 74.50
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