Page 195 - A O Smith 2012

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Century® Industrial • Multi-Speed • Three Phase Motors
Totally Enclosed Fan-Cooled (TEFC) - Rigid Base - Two Speed
Variable Torque - 1/.25 thru 50/12.5 HP
Features:
• Ball Bearings • 60 Hz • 40˚C Ambient • Class B or F Insulation • Service Factor 1.15
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 Cast Insulation “C” High Spd. Low Spd.
HP Volts High Spd.* Low Spd.* Amps Frame Number Iron Class Dim. Efficiency Efficiency Notes
Two Speed 1800/900 RPM • Two Winding • Variable Torque
1.5~.37 460 1-1⁄2 .19 2.1/.95 145T M145 B 13.7 1,49
15~3.7 460 15 1.87 19.5/7.5 256T M445 √ F 24.8 88.0 75.0 1,11
50~12.5 460 50 6.25 59.0/19.0 364T M681 √ F 33.3 92.4 89.5 1
Notes:
1. Item to be discontinued when stock is depleted
11. C & D flange kit available
49. 1.0 Service Factor
*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.
M681
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