The Castair I51CUC2-S is a 5HP single-phase cube pump compressor with a mounted starter, running at 420 RPM to produce its rated CFM output. Where the I51CUC1-S runs at 767 RPM, this CUC2 configuration operates at 420 RPM — an even slower pump speed that pushes the low-RPM longevity advantage further. Slower pump speed means more pump life per hour of operation, and in a shop that runs its compressor all day, that margin adds up. The mounted starter and single-phase operation keep installation straightforward.
Note: Full manufacturer specification sheets were not available at time of publication. The 420 RPM figure is sourced from the product name data. Contact us to confirm CFM rating, PSI, tank size, and voltage before ordering.
Key Features
- 5 HP Industrial Motor: Commercial-grade sustained output
- Cube Pump at 420 RPM: Exceptionally low pump speed for maximum longevity and minimal heat buildup
- Single-Phase Power (230V): Standard shop electrical compatible
- Mounted Magnetic Starter: Factory-installed overload protection — wire and run
- Industrial Series Construction: Castair commercial-grade build quality
Technical Specifications
- Horsepower: 5 HP
- Phase: Single-phase (1-phase)
- Pump RPM: 420 RPM
- Pump Type: Cube pump
- Starter: Mounted magnetic starter included
- Model: I51CUC2-S
- Voltage: 230V single-phase (verify at order)
- CFM / PSI / Tank Size: Contact us for confirmed specifications
CUC1-S vs. CUC2-S: Which Is Right for Your Shop?
The CUC1-S runs at 767 RPM; the CUC2-S runs at 420 RPM. Both are cube pump designs, both are 5HP single-phase. The CUC2-S slower pump speed means longer pump life and lower operating temperatures, which matters most in shops where the compressor runs nearly continuously. If your compressor runs 6+ hours a day, the slower-speed CUC2-S is worth serious consideration over the CUC1-S.
What This Compressor Handles
- High-duty-cycle shops where the compressor rarely has an extended off-cycle
- Facilities where heat buildup and pump wear are the primary concerns
- Auto repair, body, and fleet service shops on single-phase power
- Any application where maximum pump life is the priority over lowest initial cost
Why Buy From OEM Diagnostic Tools?
We have supplied professional shops with compressors and equipment since 2016. We carry the full Cast Air cube pump line and can help you decide between CUC1 and CUC2 RPM configurations based on your actual duty cycle. Free shipping, full manufacturer warranty, and real pre-sale support.
Call for pricing and availability.
Call 866-217-0063 for quick answers and help!
