Marathon 25 HP Vertical Solid Shaft P-Base Motor, 3 phase, 3600 RPM, 230/460 V, 256HPV Frame, ODP - M821A

Catalog #:M821A
Part #:256TTDX4310
  • Normal and Medium thrust
  • EPAct and NEMA Premium efficiencies
  • Ball bearings and angular contact bearings for medium thrust applications
  • Class B insulation
  • 1.15 Service Factor
  • Suitable for 230 volt part winding start through 100 HP (dual voltage motors)
  • Heavy duty lifting lugs
  • Drip cover/canopy cap included
  • UL Recognized and CSA Certified
  • UL Listed for Fire Pump applications (except as noted)
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General Specifications

Weight: 255.00 LB Packaged Length: 30.5 IN
Packaged Width: 16.81 IN Packaged Height: 14.75 IN

Nameplate Specifications

Output HP: 25 Hp Output KW: 18.7 kW
Frequency: 60 Hz Voltage: 230/460 V
Current: 58/29 A Speed: 3520 rpm
Service Factor: 1.15 Phase: 3
Efficiency: 91 % Power Factor: 88.3
Duty: CONTINUOUS Insulation Class: B
Design Code: B KVA Code: G
Frame: 256HPV Enclosure: DP
Thermal Protection: NOT Ambient Temperature: 40 °C
Drive End Bearing Size: 6309 Opp Drive End Bearing Size: 6208
UL: Recognized CSA: Y
CE: Y IP Code: 22

Technical Specifications

Electrical Type: SQ CAGE IND RUN Starting Method: ACROSS THE LINE
Poles: 2 Rotation: REV
Resistance Main: 0.365 Ohms Mounting: ROUND
Motor Orientation: SHAFT DOWN Drive End Bearing: BALL
Opp Drive End Bearing: BALL Frame Material: ROLLED STEEL
Shaft Type: HP Overall Length: 24.3 in
Frame Length: 15.15 in Shaft Diameter: 1.63 in
Shaft Extension: 2.75 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)
2/3 150.00 517.0 77.00 205.0 2,100 25.00
1/3 175.00 603.0 62.00 165.0 1,000 25.00
Pull-Up 165.00 569.0 65.00 173.0 1,500 25.00
Locked-Rotor 182.00 628.0 72.00 192.0 0 41.5 25.00
Full Load 29.00 100.0 37.50 100.0 3,520 25.00
Break-Down 125.00 431.0 110.00 293.0 3,100 70.5 25.00
No Load 9.50 33.0 0.00 0.0 3,600 25.00

Load Characteristics

% of Rated Load 0 % 25 % 50 % 75 % 100 % 115 % 125 %
Current (Amps) 8.50 11.50 16.50 22.00 29.00 33.00 36.50
Rated Output (KW) 0.50 5.20 10.00 15.00 20.50 23.50 25.50
Efficiency (%) 0.0 89.5 91.0 92.4 91.0 91.0 90.2
Power Factor (%) 6.0 56.0 79.0 85.0 88.3 89.0 89.0
Speed (RPM) 3,600 3,580 3,565 3,545 3,520 3,510 3,500
Temp. Rise @ FL 0.0 0.0 0.0 0.0 55.0 65.0 80.0
Torque (ft-lbs) 0.00 9.20 18.50 28.00 37.50 43.00 47.00
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