About Electric Motors
When replacing a motor, use the information on your motor’s nameplate to guide your selection.
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Base-Mount AC Motors
Replace old base-mount motors to keep your equipment moving. Motors are rated for continuous duty and mount at any angle. You can wire for clockwise or counterclockwise rotation; instructions are included.
To use a motor with a variable frequency drive (AC motor speed control), choose a three-phase motor that’s inverter rated.
Motors with a welded base have a base that's welded to the enclosure. Motors with a vibration-damping base have rubber rings between the base and enclosure to minimize vibration.
Motors with overload protection turn off in overload conditions to prevent motor damage. Manual overload protection must be reset manually to start the motor after it cools. Automatic overload protection starts the motor automatically after it cools.
For technical drawings and 3-D models, click on a part number.
O'all | Shaft | Insulation | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Power, hp | Max. Speed, rpm | Full Load Current, A | Inverter Rated | Motor Enclosure Type | Lg. | Wd. | Ht. | Dia. | Lg. | Center to Base | Overload Protection Type | Class | Max. Temp., °F | Each | |
115/230 Volts AC, Single Phase | |||||||||||||||
NEMA 56H—Welded Base (Keyed Shaft) | |||||||||||||||
| 1 1/2 | 1,725 | 12.2/6.1 | No | Totally Enclosed Fan Cooled (TEFC) | 14" | 9 1/2" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | B | 266° | 0000000 | 0000000 |
| 1 1/2 | 1,725 | 12.4/6.2 | No | Open Dripproof (ODP) | 14" | 9 3/4" | 9" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1 1/2 | 3,480 | 11.8/5.9 | No | Open Dripproof (ODP) | 12 3/4" | 9" | 9" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
NEMA 56/NEMA 56H—Welded Base (Keyed Shaft) | |||||||||||||||
| 3/4 | 1,140 | 7.8/4.2 | No | Totally Enclosed Fan Cooled (TEFC) | 13" | 9 1/2" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | B | 266° | 0000000 | 00000000 |
| 1 | 1,725 | 12.5/6.3 | No | Totally Enclosed Fan Cooled (TEFC) | 13" | 9 1/2" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 0000000 | 000000 |
| 1 | 1,725 | 13/6.5 | No | Totally Enclosed Fan Cooled (TEFC) | 13" | 10" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | Automatic | F | 311° | 0000000 | 000000 |
| 1 | 3,450 | 11.8/5.9 | No | Totally Enclosed Fan Cooled (TEFC) | 13" | 9 1/2" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | B | 266° | 0000000 | 000000 |
| 1 | 3,450 | 12/6 | No | Totally Enclosed Fan Cooled (TEFC) | 13" | 10" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | Manual | B | 266° | 00000000 | 000000 |
| 1 1/2 | 3,450 | 16/8 | No | Totally Enclosed Fan Cooled (TEFC) | 13" | 9 1/2" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | B | 266° | 0000000 | 000000 |
| 2 | 3,450 | 23/11.5 | No | Totally Enclosed Fan Cooled (TEFC) | 14" | 10" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | Manual | B | 266° | 00000000 | 000000 |
| 2 | 3,470 | 15.6/7.8 | No | Open Dripproof (ODP) | 14" | 9" | 9" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
NEMA 56/NEMA 56H—Vibration-Damping Base (Keyed Shaft) | |||||||||||||||
| 1 | 1,725 | 13/6.5 | No | Open Dripproof (ODP) | 11 1/2" | 6 3/4" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | Automatic | B | 266° | 0000000 | 000000 |
208-230/460 Volts AC, Three Phase | |||||||||||||||
NEMA 56H—Welded Base (Keyed Shaft) | |||||||||||||||
| 3/4 | 1,140 | 3.3-3/1.5 | No | Totally Enclosed Fan Cooled (TEFC) | 13" | 8 1/2" | 6 3/4" | 5/8" | 1 7/8" | 3 1/2" | __ | B | 266° | 0000000 | 000000 |
Adjustable Motor-Mounting Bases
Increase energy efficiency in belt-driven systems while reducing wear on components—use one of these bases to adjust your motor position to get the proper belt tension.
Bases for variable-speed applications allow movement while operating to compensate for vibration and varying loads. They’re often used for automatic belt tensioning with spring-loaded pulleys in variable-speed drive applications.
For technical drawings and 3-D models, click on a part number.
| For Motor NEMA Frame Size | For Max. Motor hp | Mounting Orientation | Max. Adjustment | Adjustment Style | Lg. | Wd. | Ht. | Each | ||
For Linear Adjustment in Variable-Speed Applications | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| E | 48, 56, 66, 143T, 145T, 182, 184, 56H, 203 | 2 | Horizontal, Vertical | 8" | Hand Crank | 18 1/8" | 8" | 3 1/4" | 0000000 | 0000000 |