Marathon 20 HP Close-Coupled Pump Motor, 3 phase, 3600 RPM, 230/460 V, 256JM Frame, TEFC - U351A

Catalog #:U351A
Part #:256TTFL16004
  • NEMA JM pump shaft dimensions
  • Mechanically locked on shaft end
  • Continuous duty
  • Aluminum frame construction
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Weight:272.00 LB
List Price: $4,304.00

General Specifications

UPC: 722856054715 Weight: 272.00 LB
Packaged Length: 30.75 IN Packaged Width: 21.75 IN
Packaged Height: 18 IN

Nameplate Specifications

Output HP: 20 Hp Output KW: 14.9 kW
Frequency: 60 Hz Voltage: 230/460 V
Current: 47.0/23.4 A Speed: 3537 rpm
Service Factor: 1.15 Phase: 3
Efficiency: 92.4 % Power Factor: 86
Duty: Continuous Insulation Class: F
Design Code: B KVA Code: G
Frame: 256JM Enclosure: Totally Enclosed Fan Cooled
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: 43

Technical Specifications

Electrical Type: Squirrel Cage Induction Run Starting Method: Across The Line
Poles: 2 Rotation: Reversible
Resistance Main: .394 Ohms Mounting: Rigid Base
Motor Orientation: Horizontal Drive End Bearing: Ball
Opp Drive End Bearing: Ball Frame Material: Aluminum
Shaft Type: JM Overall Length: 27.27 in
Frame Length: 13.75 in Shaft Diameter: 1.25 in
Shaft Extension: 5.25 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 145.00 620.0 55.00 185.0 0 37.0 20.00
Full Load 23.00 98.0 29.70 100.0 3,535 20.00
Break-Down 100.00 427.0 84.00 283.0 3,155 67.0 20.00
2/3 123.00 526.0 58.00 195.0 2,400 20.00
No Load 7.00 30.0 0.00 0.0 3,600 20.00
Pull-Up 131.00 560.0 50.00 168.0 1,800 20.00
1/3 138.00 590.0 47.00 158.0 1,200 20.00

Load Characteristics

% of Rated Load 0 % 25 % 50 % 75 % 100 % 115 % 125 %
Current (Amps) 7.00 9.00 13.00 18.00 23.40 26.00 29.50
Rated Output (KW) 0.50 4.00 8.00 12.00 16.50 18.00 20.50
Efficiency (%) 0.0 87.5 91.0 91.7 92.4 91.7 90.2
Power Factor (%) 10.5 58.5 78.0 85.0 86.0 87.0 88.5
Speed (RPM) 3,600 3,585 3,570 3,555 3,537 3,525 3,515
Temp. Rise @ FL 0.0 30.0 25.0 0.0 55.0 75.0 90.0
Torque (ft-lbs) 0.00 7.50 15.00 22.00 29.70 31.00 37.50
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