About Hazardous Location Environmental Ratings
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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.
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 | Class | Max. Temp., °F | Each | |
115/230 Volts AC, Single Phase | ||||||||||||||
NEMA 48—Welded Base (D-Profile Shaft) | ||||||||||||||
| 1/4 | 1,725 | 2.6/1.3 | No | Open Dripproof (ODP) | 10" | 8" | 8 1/4" | 1/2" | 1 1/2" | 3" | F | 311° | 00000000 | 0000000 |
| 1/3 | 1,725 | 6/3 | No | Totally Enclosed Fan Cooled (TEFC) | 10 3/4" | 8 1/2" | 7 1/2" | 1/2" | 1 1/2" | 3" | B | 266° | 00000000 | 000000 |
| 1/3 | 1,740 | 3.4/1.7 | No | Open Dripproof (ODP) | 9 3/4" | 9" | 8 1/8" | 1/2" | 1 1/2" | 3" | F | 311° | 00000000 | 000000 |
| 1/2 | 1,725 | 4.7/2.4 | No | Open Dripproof (ODP) | 10 3/4" | 8" | 8 1/4" | 1/2" | 1 1/2" | 3" | B | 266° | 00000000 | 000000 |
| 1/2 | 1,725 | 7.4/3.7 | No | Totally Enclosed Fan Cooled (TEFC) | 11 1/2" | 8 1/2" | 7 1/2" | 1/2" | 1 1/2" | 3" | B | 266° | 00000000 | 000000 |
| 1/2 | 3,450 | 4.9/2.5 | No | Open Dripproof (ODP) | 10" | 8" | 8 1/4" | 1/2" | 1 1/2" | 3" | F | 311° | 00000000 | 000000 |
208-230/460 Volts AC, Three Phase | ||||||||||||||
NEMA 48—Welded Base (D-Profile Shaft) | ||||||||||||||
| 1/3 | 1,725 | 1.9-1.6/0.8 | No | Totally Enclosed Fan Cooled (TEFC) | 10 3/4" | 8 1/2" | 6 1/4" | 1/2" | 1 1/2" | 3" | B | 266° | 00000000 | 000000 |
Hazardous Location Base-Mount AC Motors
These motors are rated for environments where hazardous material is present. They are continuous duty and mount horizontally. You can wire for clockwise or counterclockwise rotation; instructions are included. The base is welded to the enclosure.
Motors with automatic overload protection turn off in overload conditions to prevent motor damage and start automatically after they cool.
Hazardous location environmental ratings indicate whether manufacturers have included safety features in products to facilitate their safe use in a hazardous environment. Before selecting a product for a hazardous location, ensure it is rated for your environment.
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 | Lg. | Wd. | Ht. | Dia | Lg. | Center to Base | Shaft Type | Overload Protection Type | Class | Max. Temp, °F | Environmental Rating | Each | |
115/208-230 Volts AC, Single Phase | ||||||||||||||||
NEMA 48 | ||||||||||||||||
| 1/4 | 1,800 | 5/2.6-2.5 | No | 12 7/8" | 7 1/4" | 8 1/8" | 1/2" | 1 1/2" | 3" | D-Profile | Automatic | B | 104° | NEC Class I Divisions 1, 2 Group D NEC Class II Divisions 1, 2 Groups F, G | 0000000 | 0000000 |
Adjustable Motor-Mounting Bases
Increase energy efficiency in belt-driven systems while reducing wear on your components—these bases allow you to adjust your motor position to reach the proper belt tension. Choose a base that fits the NEMA frame of your motor, which is listed on the nameplate.
Bases for angular adjustment are good for applications with a 20° and greater angle between the motor and driven unit.
Bases for constant-speed applications keep your motor in a fixed position while operating equipment with a constant speed, such as fans. You can only adjust the motor position when your system is off.
Bases for variable-speed applications can move while operating to make up for vibration and varying loads. You can adjust the motor position manually while your system is running.
Bases with automatic tensioning have springs, so they maintain dynamic belt tensioning during operation to help the motor bearings, belts, and pullers last longer. They’re good for changing and challenging workloads, such as rock crushers, and excellent for reducing maintenance needed for re-tensioning.
For technical drawings and 3-D models, click on a part number.
| Style | For Motor NEMA Frame Size | For Max. Motor hp | Mounting Orientation | Max. Adjustment | Tilt Angle | Adjustment Style | Tensioning Type | Lg. | Wd. | Ht. | Each | |
For Linear Adjustment in Constant-Speed Applications | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| A | 48 | 3 | Horizontal | 3" | __ | Cap Screw | Manual | 10" | 6 1/4" | 1 1/8" | 000000000 | 000000 |
For Linear Adjustment in Variable-Speed Applications | ||||||||||||
| C | 48, 56 | 3 | Any Angle | 2 1/8" | __ | Hex Nuts | Automatic | 9 1/2" | 5 7/8" | 1 3/8" | 00000000 | 000000 |
| D | 48, 56 | 3 | Any Angle | 5 7/8" | __ | Hand Crank | Manual | 13 1/8" | 6 1/4" | 3" | 0000000 | 000000 |
| E | 48, 56, 56H, 66, 143T, 145T, 182, 184, 203 | 2 | Horizontal, Vertical | 8" | __ | Hand Crank | Manual | 18 1/8" | 8" | 3 1/4" | 0000000 | 000000 |
For Angular Adjustment in Variable-Speed Applications | ||||||||||||
| G | 48, 56 | 3 | Any Angle | __ | 0° to 30° | Hand Crank | Manual | 12 1/2" | 5 7/8" | 3 1/2" | 0000000 | 000000 |