Marathon W551A 20 HP, 3600 RPM three-phase general purpose motor with a NEMA 256T frame and Totally Enclosed Fan Cooled enclosure. Operates on 460V at 60 Hz with 1.15 service factor. Manufactured by Marathon Electric to industrial duty standards.

Marathon® Severe Duty Motor, 2-Pole Squirrel Cage Inverter Rated, Special Features: Severe Duty Motors, 20 hp, 460 V, 23.7 A, 60 Hz, 3 ph, 3540 rpm, 1 Speed, IP56 Totally Enclosed Fan Cooled, 256T Frame, 1.626 in Dia Shaft, Reversible, Service Factor: 1.15, Ball Bearing, Rigid Base Mount, 40 deg C, Insulation Class: Class H, Cast Iron, 25.89 in L x 19.64 in W x 15.22 in H

Features:

• Meets or exceeds NEMA Premium® efficiency
• 100% cast iron construction for rigidity and reduced vibration
• Inpro/Seal® VBX® bearing isolators on drive end shaft extension TENV and on both ends of TEFC
• MAX GUARD® class H insulation system
• Constant torque for inverter duty
• Sintered bronze breather with brass drain and breather
• Bearing caps and precision balanced to 0.08 in/s
• 1.15 service factor on sinewave and 1 service factor on IGBT power

Specs:

• Service Factor: 1.15
• Special Features: Severe Duty Motors
• Insulation Class: Class H
• Shaft Size: 1.626 in Dia
• Phase: 3 ph
• Horsepower: 20 hp
• Number of Speeds: 1
• Rotation: Reversible
• Frame: 256T
• Bearing Type: Ball
• Temperature Rating: 40 deg C
• Enclosure Type: IP56 Totally Enclosed Fan Cooled
• Speed: 3540 rpm
• Frequency Rating: 60 Hz
• Mounting Type: Rigid Base
• Amperage Rating: 23.7 A
• Voltage Rating: 460 V
• Dimensions: 25.89 in L x 19.64 in W x 15.22 in H
• Material: Cast Iron
• Type: 2-Pole Squirrel Cage Inverter Rated