Choosing an industrial motor is really a two-part question: what power do you have available, and what job will the motor do? One option is a heavy, sealed motor; the other is a lighter SPL motor built for air compressor replacement. The right choice depends on your power supply and how much continuous work the motor will handle.
Quick Verdict
At $330.95, the 1800 RPM motor is the stronger choice for continuous, demanding industrial applications. At $128.79, the SPL motor is the practical, lower-priced pick for air compressor replacements.
Comparison Table
| Feature | 1800 RPM 184T TEFC | 5HP SPL 3450 RPM |
|---|---|---|
| Horsepower | 5 HP | 5 HP |
| Price | $330.95 | $128.79 |
| AC Phase | Three Phase | Single Phase |
| Base RPM | 1800 | 3450 |
| Frame | 184T (NEMA Design B) | 56 Frame |
| Shaft | 1-1/8" keyed | 5/8" keyed |
| Enclosure | TEFC/IP55 | ODP |
| Weight | 104 lbs | 46.2 lbs |
| Duty | Severe Duty, 25% overload (1.15 SF) | Commercial Duty for air compressors |
Where Each Product Wins
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Product Notes
1800 RPM 5 HP Electric Motor 184T Frame TEFC 230/460V Severe Duty 3 Phase
This motor is built for industrial environments where dust, moisture, and heavy loads are the norm. Its TEFC/IP55 enclosure keeps out debris and water, and the severe-duty design handles 25% overload with a 1.15 service factor. The dual-voltage 230/460V wiring adds flexibility for different shop voltages, while Class F insulation helps it run cooler in high-heat conditions. The main limitation is that it requires a three-phase electrical supply.
5HP SPL Air Compressor Electric Motor 230V 3450RPM 5/8" Keyed Shaft Single Phase
Running on standard single-phase 230V, this 3450 RPM motor is designed as a direct swap for air compressor duty. The 56 frame and 5/8" keyed shaft make it easy to match with existing compressor pulleys, and the CW/CCW reversible rotation gives you flexibility during installation. It weighs 46.2 pounds, so it is easier to handle during installation. The trade-off is the open drip-proof (ODP) enclosure, so it is not sealed against dust and moisture the way a TEFC motor is. On top of that, the 3450 RPM speed may not be right for applications that need a slower output speed. For air compressor replacements, this is a lower-priced, practical pick.
Final Choice by Use Case
Choose the 1800 RPM motor for harsh environments and jobs that need a sealed, severe-duty motor. Choose the SPL motor for air compressor replacements on a lower price budget.
