NEMA 250 Frame Size Speed Capability Squirrel Cage Induction Motors.

Electric Motors, Generators and Drives

NEMA Continuous speed capability for general purpose design A and B Direct coupled (TS shaft for motors above the 250 Frame size) squirrel cage induction motors.

NEMA
Horsepower
Totally Enclosed Fan-Cooled
Open Drip proof
Synchronous Speed at 60 Hz
3600
1800
1200
3600
1800
1200
Minimum Design Speed
1/4
7200
3600
2400
7200
3600
2400
1/3
7200
3600
2400
7200
3600
2400
1/2
7200
3600
2400
7200
3600
2400
3/4
7200
3600
2400
7200
3600
2400
1
7200
3600
2400
7200
3600
2400
1.5
7200
3600
2400
7200
3600
2400
2
7200
3600
2400
7200
3600
2400
3
7200
3600
2400
7200
3600
2400
5
7200
3600
2400
7200
3600
2400
7.5
5400
3600
2400
7200
3600
2400
10
5400
3600
2400
5400
3600
2400
15
5400
3600
2400
5400
3600
2400
20
5400
3600
2400
5400
3600
2400
25
5400
2700
2400
5400
2700
2400
30
5400
2700
2400
5400
2700
2400
40
4500
2700
2400
5400
2700
2400
50
4500
2700
2400
4500
2700
2400
60
3600
2700
2400
4500
2700
2400
75
3600
2700
2400
3600
2700
2400
100
3600
2700
1800
3600
2700
1800
125
3600
2700
1800
3600
2700
1800
150
3600
2700
1800
3600
2700
1800
200
3600
2300
1800
3600
2700
1800
250
3600
2300
1800
3600
2300
1800
300
3600
2300
1800
3600
2300
1800
350
3600
1800
1800
3600
1800
1800
400
3600
1800
-
3600
1800
-
450
3600
1800
-
3600
1800
-
500
3600
1800
-
3600
1800
-
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