Brochure

249
www.centuryelectricmotor.com
IEC/NEMA Comparison 
Dimensions in Millimeters kW/Hp** Frame Assignments
IEC  H A B K D C E  3Phase–TEFC  
 NEMA D 2E 2F H U BA N-W 2Pole 4Pole 6Pole
56  56 90 71 5.8 9 36 20 — — —
 NA — — — — — — — — — —
63  63 100 80 7 11 40 23 .25kW .18kW —
 42 66.7 88.9 42.9 7.1 9.5 52.4 28.6 1/3Hp 1/4Hp —
71  71 112 90 7 14 45 30 .55 .37 —
 48 76.2 108 69.9 8.7 12.7 63.5 38.1 3/4 1/2 —
80  80 125 100 10 19 50 40 1.1 .75 .55kW
 56 88.9 123.8 76.2 8.7 15.9 69.9 47.8 11/2 1 3/4Hp
90S  90 140 100 10 24 56 50 1.5 1.1 .75
 143T 88.9 139.7 101.6 8.7 22.2 57.2 57.2 2 11/2 1
90L  90 140 125 10 24 56 50 2.2 1.5 1.1
 145T 88.9 139.7 127 8.7 22.2 57.2 57.2 3 2 11/2
100L  100 160 140 12 28 63 60 3 2.2 1.5
 NA — — — — — — — 4 3 2
112S  112 190 114 12 28 70 60 3.7 2.2 1.5
 182T 114.3 190.5 114.3 10.4 28.6 69.9 69.9 5 3 2
112M  112 190 140 12 28 70 60 3.7 4 2.2
 184T 114.3 190.5 139.7 10.4 28.6 69.9 69.9 5 5.4/5 —
132S  132 216 140 12 38 89 80 7.5 5.5 3
 213T 133.4 215.9 139.7 10.4 34.9 88.9 85.9 10 71/2 —
132M  132 216 178 12 38 89 80 — 7.5 5.5
 215T 133.4 215.9 177.8 10.4 34.9 88.9 85.9 — 10 71/2
160M*  160 254 210 15 42 108 110 15 11 7.5
 254T 158.8 254 209.6 13.5 41.3 108 101.6 20 15 10
160L*  160 254 254 15 42 108 110 18.5 15 11
 256T 158.8 254 254 13.5 41.3 108 101.6 25 20 15
180M*  180 279 241 15 48 121 110 22 18.5 —
 284T 177.8 279.4 241.3 13.5 47.6 120.7 117.4 — 25 —
180L*  180 279 241 15 48 121 110 22 22 15
 286T 177.8 279.4 279.4 13.5 47.6 120.7 117.4 30 30 20
200M*  200 318 267 19 55 133 110 30 30 —
 324T 203.3 317.5 266.7 16.7 54 133.4 133.4 40 40 —
200L*  200 318 305 19 55 133 110 37 37 22
 326T 203.2 317.5 304.8 16.7 54 133.4 133.4 50 50 30
225S*  225 356 286 19 60 149 140 — 37 30
 364T 228.6 355.6 285.8 16.7 60.3 149.4 149.4 — 50/75 40
225M*  225 356 311 19 60 149 140 45 45 37
 365T 228.6 355.6 311.2 16.7 60.3 149.4 149.4 60/75 60/75 50
250M*  250 406 349 24 65 168 140 55 55 —
 405T 254 406.4 349.3 20.6 73 168.4 184.2 75/100 75/100 —
280S*  280 457 368 24 75 190 140 — — 45
 444T 279.4 457.2 368.3 20.6 85.7 190.5 215.9 — — 60/100
280M*  280 457 419 24 75 190 140 — — 55
 445T 279.4 457.2 419.1 20.6 85.7 190.5 215.9 — — 75/125
*ShaftdimensionsoftheseIECframesmayvarybetweenmanufacturers.
**Horsepowerlistedisclosestcomparableratingwithsimilarmountingdimensions.Insomeinstancesthisresultsin
greaterHpratingthanrequired.Forexample,37kW,4poleconvertsto50HpbutnearestHpratingintheNEMAframe
havingcomparabledimensionsis75Hp.IntheseinstancestheHpratingprintedinblackisthedirectconversion,andHp
printedinRedistheHpofthedimensionallydesirableframe. OBSERVE CAUTION if the drive train or driven
load is likely to be damaged by the greater Hp.
EquivalentHpcanbecalculatedbymultiplyingthekWratingby1.341.MultiplyHpby.7457toconvertHptokW.
Toconvertfrommillimeterstoinches,multiplyby.03937.Toconvertfrominchestomillimeters,multiplyby25.40.
Fraction/Decimal/Millimeter Conversions
 Fraction Decimal Millimeter Fraction Decimal Millimeter MM Inch
 
1
⁄
64
 .015625 0.397
33
⁄
64
 .515625 13.097 1 .0394
 

1
⁄
32
 .03125 0.794
17
⁄
32
 .53125 13.494 2 .0787



3
⁄
64
 .046875 1.191
35
⁄
64
 .546875 13.891 3 .1181



1
⁄
16
 .0625 1.588 
9
⁄
16
 .5625 14.288 4 .1575
 

5
⁄
64
 .078125 1.984 
37
⁄
64
 .578125 14.684 5 .1969



3
⁄
32
 .09375 2.381 
19
⁄
32
 .59375 15.081 6 .2362



7
⁄
64
 .109375 2.778 
39
⁄
64
 .609375 15.478 7 .2756
 
1
⁄
8
 .125 3.175 
5
⁄
8
 .625 15.875 8 .3150



9
⁄
64
 .140625 3.572 
41
⁄
64
 .640625 16.272 9 .3543



5
⁄
32
 .15625 3.969
21
⁄
32
 .65625 16.669 10 .3937



11
⁄
64
 .171875 4.366 
43
⁄
64
 .671875 17.066 11 .4331



3
⁄
16
 .1875 4.763 
11
⁄
16
 .6875 17.463 12 .4724



13
⁄
64
 .203125 5.159 
45
⁄
64
 .703125 17.859 13 .5118



7
⁄
32
 .21875 5.556 
23
⁄
32
 .71875 18.256 14 .5512
 
15
⁄
64
 .234375 5.953 
47
⁄
64
 .734375 18.653 15 .5906
 

1
⁄
4
 .25 6.350 
3
⁄
4
 .75 19.050 16 .6299
 
17
⁄
64
 .265625 6.747 
49
⁄
64
 .765625 19.447 17 .6693



9
⁄
32
 .28125 7.144 
25
⁄
32
 .78125 19.844 18 .7087

19
⁄
64
 .296875 7.541 
51
⁄
64
 .796875 20.241 19 .7480



5
⁄
16
 .3125 7.938 
13
⁄
16
 .8125 20.638 20 .7874



21
⁄
64
 .328125 8.334 
53
⁄
64
 .828125 21.034 21 .8268



11
⁄
32
 .34375 8.731 
27
⁄
32
 .84375 21.431 22 .8661



23
⁄
64
 .359375 9.128 
55
⁄
64
 .859375 21.828 23 .9055



3
⁄
8
 .375 9.525 
7
⁄
8
 .875 22.225 24 .9449



25
⁄
64
 .390625 9.922 
57
⁄
64
 .890625 22.622 25 .9843



13
⁄
32
 .40625 10.319 
29
⁄
32
 .90625 23.019 



27
⁄
64
 .421875 10.716 
59
⁄
64
 .921875 23.416



7
⁄
16
 .4375 11.113 
15
⁄
16
 .9375 23.813



29
⁄
64
 .453125 11.509 
61
⁄
64
 .953125 24.209 
 
15
⁄
32
 .46875 11.906 
31
⁄
32
 .96875 24.606 

31
⁄
64
 .484375 12.303 
63
⁄
64
 .984375 24.003

1
⁄
2
 .5 12.700 1 1.0 25.400
To convert millimeters
into inches, multiply
by .03937.
To convert inches into
millimeters, multiply
by 25.40.
3600 RPM 1800 RPM 1200 RPM 900 RPM
“T”
Frames
1964
“U”
Frames
1952
Original
NEMA
Frames
“T”
Frames
1964
“U”
Frames
1952
Original
NEMA
Frames
“T”
Frames
1964
“U”
Frames
1952
Original
NEMA
Frames
“T”
Frames
1964
“U”
Frames
1952
Original
NEMA
Frames
 1 — — — 143T 182 203 145T 184 204 182T 213 225
 1
1/2
143T 182 203 145T 184 204 182T 184 224 184T 213 254
 2 145T 184 204 145T 184 224 184T 213 225 213T 215 254
 3 145T
/

1
82T 184 224 182T 213 225 213T 215 254 215T 254U 284
 5 182T/184T 213 225 184T 215 254 215T 254U 284 254T 256U 324
 7
1/2
184T
/

2
13T 215 254 213T 254U 284 254T 256U 324 256T 284U 326
 10 213T
/

2
15T 254U 284 215T 256U 324 256T 284U 326 284T 286U 364
 15 215T
/

2
54T 256U 324 254T 284U 326 284T 324U 364 286T 326U 365
 20 254T/256T 284U/286U 326 256T 286U 364 286T 326U 365 324T 364U 404
 25 256T
/

2
84TS 286U/324U 364S/365S 284T 324U 364/365 324T 364U 404 326T 365U 405
 30 284TS
/

2
86TS 324S/326S 364S/404S 286T 326U 365/404 326T 365U 405 364T 404U 444
 40 286TS
/

3
24TS 326S/364US 365S/405S 324T 364U 404/405 364T 404U 444 365T 405U 445
 50 324TS/326TS 364US 404S/444S 326T 365US 405S/444S 365T 405U 445 404T 444U 504U
 60 326TS
/

3
64TS 365US/405US 405S/445S 364TS 404US/405US 444S/445S 404T 444U 504U 405T 445U 505
 75 364TS
/

3
65TS 404US/444US 444S/504S 365TS 405US/444US 445S/504S 405T 445U 505 444T — —
 100 365TS
/

4
05TS 405US/445US 445S/505S 404TS/405TS 444US/445US 504S/505S 444T — — 445T — —
 125 404TS/444TS 444US 504S 405T/444TS 445US 505S 445T — — — — —
 150 405TS
/

4
45TS 445US 505S 444TS/445TS — — — — — — — —
 200 444TS — — 445TS — — — — — — — —
 250 445TS — — — — — — — — — — —
NEMA
Frame
Program
Hp
NEMA Frame Assignments
Open and TEFC