Choosing an industrial motor isn't just about grabbing the highest horsepower number. The first question is what kind of power your shop provides: single-phase or three-phase. The two new 56-frame motors here make that decision concrete: a 5HP single-phase air compressor motor and a 2HP three-phase 56C motor. Their price difference is about $48, so the decision comes down to how your shop is wired and what you're attaching the motor to.
Quick verdict If your shop has single-phase 230V service and you need a no-fuss replacement for an air compressor, the 5HP SPL Air Compressor Motor is the lower-cost, higher-speed choice. If you have three-phase power and need a general-purpose C-face motor that runs at 1800 RPM, the 2HP 56C Three-Phase Motor is the better fit.
| Aspect | 5HP SPL Air Compressor Motor | 2HP 56C Three-Phase Motor |
|---|---|---|
| Price | $128.79 | $176.80 |
| Phase and voltage | Single-phase, 230V | Three-phase, 208-230/460V |
| Speed | 3450 RPM | 1800 RPM (base 1750 RPM) |
| Frame and mounting | 56 frame, 5/8-inch keyed shaft | 56C frame, C-face with removable base |
| Construction | ODP, CW/CCW, commercial duty | TEFC, fan-cooled, Class F insulation |
| Best for | Direct air-compressor motor swaps | Pumps, fans, and general machinery with C-face mounting |
Where each product wins The 5HP motor wins when your setup runs on single-phase 230V and you need a 3450 RPM replacement with a 5/8-inch keyed shaft. It is also the more accessible price point. The 2HP motor wins when you need 1800 RPM, a TEFC enclosure, and a C-face mounting option for equipment that is driven through a 56C face.
5HP SPL Air Compressor Electric Motor
Built specifically for air-compressor duty, this motor uses a reversible CW/CCW rotation so you can change direction during installation. Its open drip-proof housing is a match for a clean, dry compressor room, and the commercial-duty construction is meant to handle the start-stop cycles of a compressor. It's the lower-priced option here, which matters if you're doing a straightforward replacement and want to keep the job cost down. The obvious limitation is that it is not a general-purpose motor: it's designed around single-phase 230V compressor service, and the open housing is less suitable for wet or dusty environments. For a direct swap on an existing compressor setup, it gets the job done without extra complexity.
2HP 56C Three-Phase Motor
This motor is the more flexible of the two when you're driving general shop equipment. The fully enclosed fan-cooled housing keeps contaminants away from the windings, and the C-face with removable base suits pumps, fans, and gear-driven machines. It's also rated for inverter duty and premium efficiency with Class F insulation, which makes it more adaptable if you plan to use a variable-frequency drive. You pay a higher price for these capabilities, but you're buying a motor with a broader application range. The limitation is that it needs three-phase power, so a single-phase-only shop will need phase conversion before it can run. It also carries 2HP instead of the 5HP rating of the other motor, so it isn't a stand-in for a high-horsepower compressor.
Final choice by use case Choose the 5HP SPL Air Compressor Motor if you need a fast 3450 RPM, single-phase 230V motor and the application is an air compressor. Choose the 2HP 56C Three-Phase Motor if you have three-phase power, need 1800 RPM, and want a TEFC C-face motor for general equipment. The decisive question is your power supply: single-phase points to the 5HP, while three-phase points to the 2HP.
