Description
256THFNA9001 – Marathon 20 HP Severe Duty Motor, 3 phase, 3600 RPM, 460 V, 256T Frame, TEFC – W551
256THFNA9001 Marathon Other Severe Duty Motors
Please advise CFM, static pressure, voltage, phase, and/or horsepower on specifications, drawings, or existing equipment for an accurate quote.
General Specifications
| UPC: |
722856021250 |
Weight: |
366 LB |
| Packaged Length: |
31.25 IN |
Packaged Width: |
22.25 IN |
| Packaged Height: |
18 IN |
Nameplate Specifications
| Output HP: |
20 Hp |
Output KW: |
14.9 kW |
| Frequency: |
60 Hz |
Voltage: |
460 V |
| Current: |
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: |
256T |
Enclosure: |
Totally Enclosed Fan Cooled |
| Thermal Protection: |
No |
Ambient Temperature: |
40 °C |
| Drive End Bearing Size: |
6309 |
Opp Drive End Bearing Size: |
6210 |
| UL: |
Recognized |
CSA: |
Y |
| CE: |
Y |
IP Code: |
56 |
Technical Specifications
| Electrical Type: |
Squirrel Cage Inverter Rated |
Starting Method: |
Line Or Inverter |
| 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: |
Cast Iron |
| Shaft Type: |
T |
Overall Length: |
25.40 in |
| Frame Length: |
12.25 in |
Shaft Diameter: |
1.625 in |
| Shaft Extension: |
4.2 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) |
| Pull-Up |
131.00 |
560.0 |
50.00 |
168.0 |
1,800 |
|
|
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 |
| 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 |
| 1/3 |
138.00 |
590.0 |
47.00 |
158.0 |
1,200 |
|
|
20.00 |
| No Load |
7.00 |
30.0 |
0.00 |
0.0 |
3,600 |
|
|
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 |
0.0 |
| Torque (ft-lbs) |
0.00 |
7.50 |
15.00 |
22.00 |
29.70 |
31.00 |
37.50 |
Marathon Motors
Regal Beloit
