Need a single-phase industrial motor? The real question is whether you need heavy compressor power or a versatile, protected motor for lighter equipment. One option is built for fast air compressor service, while the other adds dual-voltage wiring and a totally enclosed housing.
Quick Verdict
Choose the SPL motor if you need high-speed air compressor output. Choose the 56C motor if you need a sealed, reversible motor with more wiring flexibility.
Listed-Price Comparison
| Product | Listed Price | Speed | Voltage | Enclosure | Price Bar |
|---|---|---|---|---|---|
| Single Phase 5HP SPL Air Compressor Electric Motor 5/8\" Keyed Shaft 230V 3450RPM | USD 141.88 | 3450 RPM | 230V | ODP | |
| 115V/230V 3/4 HP Electric Motor Single Phase 1725 rpm 5/8'' shaft 56C Frame | USD 144.06 | 1725 RPM | 115/230V | TEFC |
Both motors are 60 Hz single-phase induction units, so they speak the same electrical language. The listed price spread is less than $3, so the decision should rest on voltage, speed, and enclosure type rather than cost.
Where Each Motor Wins
The SPL motor wins on raw power and speed. Its fast rotation and 5/8-inch keyed shaft are well matched to air compressor pulleys, and the dual rotation direction adds flexibility.
The 56C motor wins on protection and install options. Its TEFC enclosure with IP55 rating handles dust and moisture better than an open drip-proof motor. The 56C frame and rigid mount suit a wide range of light industrial equipment, and the reversible rotation helps when direction matters.
Product Notes
Single Phase 5HP SPL Air Compressor Electric Motor 5/8\" Keyed Shaft 230V 3450RPM
This motor is built for high-speed compressor service. It delivers 5 horsepower at 3450 RPM on a 230V circuit, drawing 17.6 full-load amps. The 5/8-inch keyed shaft and 1.88-inch shaft length are practical for compressor applications. It offers dual rotation direction, factory set to CCW. At $141.88, it is the lower-priced option in this pairing. The main limitation is the voltage: it is 230V only, so you cannot run it on a 115V supply. The open drip-proof enclosure is also less protective than a totally enclosed unit. This makes it a strong choice for shops already wired for 230V.
115V/230V 3/4 HP Electric Motor Single Phase 1725 rpm 5/8'' shaft 56C Frame
This motor brings flexibility to lighter duty jobs. It runs on either 115V or 230V, with full-load amps of 11.0/5.5, and turns at 1725 RPM. The 56C frame, 5/8-inch keyed shaft, and 1.88-inch shaft length mirror the shaft geometry of the larger motor. The TEFC enclosure and IP55 rating protect against dust and moisture, and the rigid mount helps secure installation. It is reversible and has a 1.15 service factor. At $144.06, it costs a little more than the SPL motor, but you're paying for adaptability and enclosure protection. The trade-off is the much lower 3/4 horsepower rating, which is not meant for high-speed compressor work.
Final Choice by Use Case
For a dedicated air compressor needing high-speed output, the SPL motor is the clear fit. For a reversible, enclosed motor, the 56C motor is the more flexible choice. Make the call based on whether you need fast compressor output or sealed, adaptable operation.
