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Century® Multi-Speed • Three Phase Motors
Dripproof - Rigid Base - Two Speed
Variable Torque - 1/.25 thru 50/12.5 HP
Features:
Applications:
For two-speed, one and two winding, variable torque applications for speed control from one speed to another while under load.
Blowers, fans, conveyeors, mixing machines, centrifugal pumps.
Oper. HP Oper. HP
Full Load
Stock
Insulation “C”
High Spd.
Low Spd.
HP
Volts
High Spd.* Low Spd.*
Amps
Frame Number
Class
Dim.
Efficiency Efficiency Notes
Two Speed 1800/900 RPM • One Winding • Variable Torque
1~.25
200-230
1
.12
3.5-3.4/1.5-1.6
143T
M126
B
12.1
76.0
59.0
21
460
1
.12
1.8/.75
143T
M116
B
12.1
76.0
59.0
21
1.5~.37
200-230
1-1⁄2
.19
5.0-4.8/2.1-2.1
145T
M127
B
12.6
80.0
65.0
21
460
1-1⁄2
.19
2.25/.95
145T
M120
B
12.6
80.0
65.0
21
2~.5
200-230
2
.25
6.2-6.4/2.6-2.7
145T
M128
B
13.1
81.0
67.0
21
3~.75
200-230
3
.375
10.1-11.6/4.1-4.4 182T
M222
B
13.7
82.0
72.0
460
3
.375
6.6/2.4
182T
M206
F
13.7
80.0
66.0
5~1.25
200-230
5
.63
16.0-17.7/6.2-6.2 184T
M223
F
13.7
85.0
77.0
460
5
.63
9.1/3.2
184T
M302
F
13.7
84.0
73.0
7.5~1.9
200-230
7-1⁄2
.94
23.0-22.5/9.3-8.2 213T
M321
F
17.3
85.0
72.0
460
7-1⁄2
.94
11.8/4.2
213T
M312
F
17.3
85.0
72.0
10~2.5
200-230
10
1.25 27.7-32.4/11.2-11.6 215T
M322
F
17.3
88.0
77.0
460
10
1.25
15.0/5.3
215T
M313
F
17.3
83.0
71.0
15~3.7
200-230
15
1.87 42.5-40.0/16.5-17.0 256T
M425
F
22.1
90.2
84.0
460
15
1.87
19.3/7.8
256T
M412
F
22.1
88.5
81.5
20~5
200-230
20
2.50 56.0-51.0/21.5-21.5 284T
M520
F
24.3
90.2
82.5
460
20
2.50
25.2/10.0
256T
M424
F
22.1
89.5
82.5
25~6.25
460
25
3.12
31.0/12.0
286T
M506
F
24.3
89.5
84.0
30~7.5
460
30
3.75
35.5/13.5
286T
M513
F
24.2
90.2
85.5
Notes:
Continues on next page
  21. Terminal in bracket construction
326. Cast Iron
*
The operating horsepower is based on the type load where the horsepower required
varies as the cube of the speed. Examples of such loads are fan or blower systems
and centrifugal pumps.Two-speed motor performance data sheets are available from
your A. O. Smith Customer Service Center.
• Ball Bearings
• 60 Hz
• 40˚C Ambient
• Class B or F Insulation
• Service Factor 1.15
M312
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