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. 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 56—Welded Base (Keyed Shaft) | |||||||||||||||
| 1/3 | 1,740 | 3.4/1.7 | No | Open Dripproof (ODP) | 10 1/8" | 9" | 8 5/8" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 0000000 |
| 1/2 | 1,725 | 4.7/2.4 | No | Open Dripproof (ODP) | 11" | 8 1/2" | 8 3/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1/2 | 1,725 | 7.4/3.7 | No | Totally Enclosed Fan Cooled (TEFC) | 12" | 9" | 8" | 5/8" | 1 7/8" | 3 1/2" | Automatic | B | 266° | 0000000 | 000000 |
| 1/2 | 3,450 | 7/3.5 | No | Totally Enclosed Fan Cooled (TEFC) | 11 1/2" | 8 1/2" | 8 3/4" | 5/8" | 1 7/8" | 3 1/2" | __ | B | 266° | 0000000 | 000000 |
| 3/4 | 1,725 | 8.2/4.1 | No | Totally Enclosed Fan Cooled (TEFC) | 12 1/2" | 9" | 8 3/4" | 5/8" | 1 7/8" | 3 1/2" | Automatic | B | 266° | 0000000 | 000000 |
| 3/4 | 1,725 | 8.4/4.2 | No | Totally Enclosed Fan Cooled (TEFC) | 12 1/2" | 8 1/2" | 8 3/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 0000000 | 000000 |
| 3/4 | 1,750 | 6.5/3.3 | No | Open Dripproof (ODP) | 12 1/4" | 9" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 3/4 | 3,450 | 6.3/3.3 | No | Open Dripproof (ODP) | 11" | 8 1/2" | 8 3/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 3/4 | 3,450 | 9.6/4.8 | No | Totally Enclosed Fan Cooled (TEFC) | 12" | 8 1/2" | 8 3/4" | 5/8" | 1 7/8" | 3 1/2" | __ | B | 266° | 0000000 | 000000 |
| 1 | 1,750 | 8.4/4.2 | No | Open Dripproof (ODP) | 12 1/4" | 9" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1 | 3,480 | 7.8/3.9 | No | Open Dripproof (ODP) | 12 1/4" | 9" | 9 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
NEMA 56—Vibration-Damping Base (Keyed Shaft) | |||||||||||||||
| 1/3 | 1,725 | 6/3 | No | Open Dripproof (ODP) | 11" | 6 3/4" | 8" | 5/8" | 1 7/8" | 3 1/2" | Automatic | B | 266° | 00000000 | 000000 |
| 1/2 | 1,725 | 8.4/4.2 | No | Open Dripproof (ODP) | 11 3/4" | 7" | 8" | 5/8" | 1 7/8" | 3 1/2" | Automatic | B | 266° | 0000000 | 000000 |
| 3/4 | 1,725 | 10/5 | No | Open Dripproof (ODP) | 12 1/2" | 7" | 8" | 5/8" | 1 7/8" | 3 1/2" | Automatic | B | 266° | 0000000 | 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 | 00000000 |
| 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 56—Welded Base (Keyed Shaft) | |||||||||||||||
| 1/4 | 1,750 | 0.8-0.8/0.4 | Yes | Totally Enclosed Nonventilated (TENV) | 11 1/4" | 9 1/4" | 7" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1/3 | 1,725 | 1.6-1.4/0.7 | No | Totally Enclosed Nonventilated (TENV) | 10 1/4" | 8 1/2" | 6 1/2" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1/2 | 1,725 | 2.1-1.6/0.8 | No | Open Dripproof (ODP) | 11 3/4" | 8 1/2" | 6 1/2" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1/2 | 1,725 | 2.1-1.8/0.9 | No | Totally Enclosed Nonventilated (TENV) | 11" | 8 1/4" | 6 1/2" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 0000000 | 000000 |
| 3/4 | 1,725 | 3.2-3/1.5 | No | Totally Enclosed Fan Cooled (TEFC) | 11 1/2" | 8 1/2" | 6 3/4" | 5/8" | 1 7/8" | 3 1/2" | __ | B | 266° | 0000000 | 000000 |
| 3/4 | 1,730 | 2.1-2/1 | No | Open Dripproof (ODP) | 11 1/4" | 9" | 7" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1 | 1,750 | 3-2.9/1.5 | No | Open Dripproof (ODP) | 11 1/4" | 9" | 7" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1 | 1,760 | 3.1-3/1.5 | Yes | Totally Enclosed Fan Cooled (TEFC) | 12 1/4" | 9 1/4" | 7 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 0000000 | 000000 |
| 1 | 3,450 | 3-2.8/1.4 | No | Totally Enclosed Fan Cooled (TEFC) | 12 1/4" | 9 1/4" | 7 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 0000000 | 000000 |
| 1 | 3,450 | 4.2-3.2/1.6 | No | Open Dripproof (ODP) | 11" | 8 1/2" | 6 1/2" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 00000000 | 000000 |
| 1 1/2 | 1,760 | 4.5-4.4/2.2 | Yes | Totally Enclosed Fan Cooled (TEFC) | 13 1/4" | 9 1/2" | 7 1/4" | 5/8" | 1 7/8" | 3 1/2" | __ | F | 311° | 0000000 | 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 56 | ||||||||||||||||
| 1/2 | 1,800 | 7.4/3.9-3.7 | No | 14 1/4" | 8 3/8" | 9 1/8" | 5/8" | 1 7/8" | 3 1/2" | Keyed | Automatic | B | 104° | NEC Class I Divisions 1, 2 Group D NEC Class II Divisions 1, 2 Groups F, G | 0000000 | 000000000 |
115/230 Volts AC, Single Phase | ||||||||||||||||
NEMA 56 | ||||||||||||||||
| 1 | 1,800 | 12.4/6.2 | No | 15 1/4" | 8 3/8" | 9 1/8" | 5/8" | 1 7/8" | 3 1/2" | Keyed | Automatic | B | 104° | NEC Class I Divisions 1, 2 Group D NEC Class II Divisions 1, 2 Groups F, G | 0000000 | 00000000 |
208-230/460 Volts AC, Three Phase | ||||||||||||||||
NEMA 56 | ||||||||||||||||
| 3/4 | 1,800 | 3.2-3/1.5 | No | 14 1/4" | 8 3/8" | 9 1/8" | 5/8" | 1 7/8" | 3 1/2" | Keyed | Automatic | B | 104° | NEC Class I Divisions 1, 2 Group D NEC Class II Divisions 1, 2 Groups F, G | 0000000 | 00000000 |
230/460 Volts AC, Three Phase | ||||||||||||||||
NEMA 56 | ||||||||||||||||
| 1 | 1,800 | 3/1.5 | Yes | 14 3/8" | 8 3/8" | 9 1/8" | 5/8" | 1 7/8" | 3 1/2" | Keyed | __ | F | 104° | NEC Class I Divisions 1, 2 Group D NEC Class II Divisions 1, 2 Groups F, G | 0000000 | 00000000 |
Base-Mount AC Brake Motors
Unlike standard AC motors, these motors have an integrated brake that activates after a power loss to hold your equipment in place. They’re often used with conveyors to stop them from moving backwards after a power loss, and with hoists to prevent them from dropping a load. Mount their base to flat surfaces. Rated for continuous duty, these motors can run equipment that never turns off. Their shaft is keyed, and they come with key stock. These motors have a TEFC (totally enclosed fan cooled) enclosure that protects better than an ODP (open dripproof) enclosure. They aren’t airtight, but they can be used in dirty, dusty, and damp environments. To keep the motor cool, the enclosure has an external fan that blows air over the outside of the motor.
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 | Environmental Rating | Each | |
230/460 Volts AC, Three Phase | |||||||||||||||
NEMA 56 | |||||||||||||||
| 3/4 | 1,720 | 2.8/1.4 | No | Totally Enclosed Fan Cooled (TEFC) | 15 1/4" | 9 1/8" | 7 1/4" | 5/8" | 1 7/8" | 3 1/2" | B | 266° | IP43 | 0000000 | 000000000 |
| 1 | 1,760 | 3.2/1.6 | Yes | Totally Enclosed Fan Cooled (TEFC) | 17 1/4" | 9 1/8" | 7 1/4" | 5/8" | 1 7/8" | 3 1/2" | B | 266° | IP43 | 0000000 | 00000000 |
Shaft Grounding Rings
Prevent motor downtime by protecting bearings from stray currents generated by variable frequency drives. These grounding rings create a path for stray currents, so they won't damage bearing surfaces. Use them on AC motors.
One-piece rings slide on from the end of the shaft. Two-piece rings simplify installation when motors are connected to equipment.
Use epoxies to install rings without having to drill or tap into motor frames.
Apply shaft coatings to motor shafts before installing the rings to improve the conductivity of the steel shaft surface that touches the grounding ring.
For technical drawings and 3-D models, click on a part number.
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 | 56 | 3 | Horizontal | 3" | __ | Cap Screw | Manual | 10 5/8" | 6 1/2" | 1 1/8" | 00000000 | 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 Constant-Speed Applications | ||||||||||||
| F | 56, 143, 145 | 3 | Any Angle | __ | 0° to 30° | Pivot | Manual | 15" | 8 3/8" | 3 1/2" | 000000000 | 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 |