The Castair I53CUC2-S is a 5HP three-phase cube pump compressor with a mounted starter, running at an ultra-low 420 RPM pump speed. At 420 RPM, this is the slowest-spinning pump in the Cast Air 5HP industrial lineup — a deliberate engineering choice that maximizes pump longevity at the cost of a higher purchase price. Three-phase motor operation adds efficiency and smooth startup characteristics. For a shop that runs its compressor hard, day in and day out, this combination of low RPM and three-phase efficiency is worth serious consideration.
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 Three-Phase Motor: Efficient commercial-duty motor operation
- Cube Pump at 420 RPM: Exceptionally low pump speed — maximum longevity, minimum heat, minimum noise
- Three-Phase Power: Requires three-phase electrical service
- Mounted Magnetic Starter: Factory-installed overload protection for clean three-phase installation
- Industrial Series Construction: Castair commercial-grade build
Technical Specifications
- Horsepower: 5 HP
- Phase: Three-phase (3-phase)
- Pump RPM: 420 RPM
- Pump Type: Cube pump
- Starter: Mounted magnetic starter included
- Model: I53CUC2-S
- Voltage: 208V/230V/460V three-phase (confirm supply voltage at order)
- CFM / PSI / Tank Size: Contact us for confirmed specifications
CUC1-S vs. CUC2-S Three-Phase: The 767 vs. 420 RPM Decision
Both units are 5HP three-phase cube pumps with mounted starters. The CUC1-S runs at 767 RPM; the CUC2-S runs at 420 RPM. The slower pump speed of the CUC2-S means lower pump temperatures per hour of operation, which extends time between rebuilds. If your compressor runs 8+ hours per day, the CUC2-S justifies its price premium through reduced maintenance and longer pump life. The CUC1-S is still a low-RPM design — just not as extreme as the 420 RPM CUC2-S.
What This Compressor Handles
- High duty-cycle three-phase shops where the compressor rarely gets a rest
- Facilities where pump rebuild costs and downtime are factored into the purchasing decision
- Auto repair, body, fleet, and manufacturing environments on three-phase power with demanding air requirements
Why Buy From OEM Diagnostic Tools?
We have supplied professional shops with Cast Air industrial compressors since 2016. If you are comparing the CUC1 and CUC2 RPM levels, or weighing cube pump vs. standard reciprocating for your shop's duty cycle, we can give you straight answers. Free shipping, full manufacturer warranty, and honest pre-sale guidance on every order.
Call for pricing and availability.
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