When you need an industrial motor, the first decision is about power supply and shaft speed. Are you working with three-phase or single-phase power? Do you need a fast-turning shaft or a slower one? These two motors sit on different sides of that divide, and our comparison will help you pick.
Quick Verdict
The Baldor-Reliance CNM3457 is the pick for facilities with three-phase power that need a high-speed motor with a sealed enclosure. The 115V/230V 3/4 HP motor is the better match for single-phase setups needing a slower, reversible motor.
At a Glance
| Product | Relative Price | Price | Horsepower | Phase | Base RPM | Voltage | Enclosure |
|---|---|---|---|---|---|---|---|
| Baldor-Reliance CNM3457 | $275.00 | 0.33 HP | Three Phase | 3450 | 208-230/460V | TENV | |
| 115V/230V 3/4 HP Motor | $144.06 | 3/4 HP | Single Phase | 1725 | 115/230V | TEFC |
The table shows how different these two motors really are-not just in price, but in the electrical system and speed they're designed for.
Where Each Motor Wins
Baldor-Reliance CNM3457 wins when your priority is a robust sealed housing and a fast-turning shaft. It offers a higher base speed, which is key for high-velocity applications.
115V/230V 3/4 HP Motor wins when you need reversible operation, a standard 56C frame, and a lower initial investment. It also delivers more horsepower, making it a stronger candidate for torque-heavy applications.
Product Notes
#### Baldor-Reliance CNM3457 3-Phase General-Purpose Industrial AC Electric Motor
The Baldor-Reliance CNM3457 is rated at 0.33 HP with a base speed of 3450 RPM. Its TENV (totally enclosed non-ventilated) enclosure is well-suited to environments with heavy dust, dirt, and light moisture, and it operates without the noise of a cooling fan. This makes it a quieter option for single-speed equipment that runs continuously. The motor's input voltage gives it flexibility for different industrial power systems, and the 3450 RPM base speed is ideal for pumps, fans, and other machinery that need a fast-turning shaft. The trade-off is the modest 0.33 HP output, which limits high-torque applications, and the open-box condition, which may matter if you prefer a factory-sealed retail package. If your facility's power matches the motor's ratings, this is a dependable industrial choice. The TENV design also means there's no external fan to clog, which is a bonus in dirty settings.
#### 115V/230V 3/4 HP Electric Motor Single Phase 1725 rpm 5/8'' shaft 56C Frame
This motor delivers 3/4 HP at a 1725 RPM base speed, making it suitable for gearboxes, belt drives, and other lower-speed equipment. The 56C frame and 5/8-inch keyed shaft fit a wide range of standard industrial components, and the TEFC enclosure uses an external fan to keep temperatures down while resisting dust and moisture. It's also reversible, so you can change the direction of rotation to match your application. With a full-load amperage of 11.0/5.5 A, it fits the typical draw for this power class. The lower price compared with the Baldor is a practical advantage when budget is a concern. Just be aware that the 1725 RPM maximum speed limits its use in high-speed applications. The 56C frame is a common industry standard, so finding a replacement or accessory is straightforward.
Final Choice by Use Case
If your power supply matches the Baldor's 208-230/460V input ratings, the Baldor-Reliance CNM3457 is the motor to install. If your wiring fits the 115/230V input ratings, the 115V/230V 3/4 HP motor is the better fit. Let your existing electrical service be the guide.
