Cast Air R1038HP75-460 — 10HP 3-Phase Rotary Screw Air Compressor, 80-Gallon Horizontal Tank, 460V, 40 CFM at 100 PSI
The Cast Air R1038HP75-460 delivers 40 CFM at 100 PSI from a 10-horsepower rotary screw compressor mounted on an 80-gallon horizontal tank, wired for 460V three-phase service. Those numbers matter: 40 CFM at 100 PSI is real, measured output — enough to run multiple air tools simultaneously in a busy production shop. If your facility is on 460V three-phase service and you need continuous-duty air supply at this output level, this is a strong candidate. Read through the details below before you decide.
The Performance Numbers That Actually Matter
- 40 CFM at 100 PSI: This is the key specification. Cubic feet per minute at 100 PSI tells you how much usable air this compressor delivers at working pressure. To put it in context: a single air impact wrench consumes roughly 4-7 CFM at 90-100 PSI; a DA orbital sander runs 10-14 CFM; a spray gun typically requires 10-25 CFM depending on the gun and tip. At 40 CFM, this compressor supports simultaneous multi-tool use in a busy bay environment without pressure sag.
- 10 Horsepower: The motor driving the screw element. In rotary screw compressors, horsepower translates reliably to CFM output — unlike piston compressors where duty cycle limitations mean you cannot always access full rated output continuously. At 10HP, this is a mid-tier commercial unit appropriate for a working shop, not a dedicated high-production or manufacturing facility.
- 80-Gallon Horizontal Tank: The receiver tank stores compressed air and buffers demand spikes. An 80-gallon tank provides meaningful storage volume. When technicians hit multiple tools simultaneously, the tank absorbs the initial draw so the compressor does not have to respond instantly to every load peak. Horizontal orientation keeps the machine low and stable.
- 100% Duty Cycle: Rotary screw compressors run continuously without rest cycles. This is fundamental to the technology. The 40 CFM at 100 PSI is available continuously — not averaged over a duty cycle. A piston compressor with a 50% duty cycle rating at the same CFM is, in practice, delivering half that air over any extended period.
460V Three-Phase — Requirements and Advantages
- 460V Three-Phase Service Required: This compressor is factory-wired for 460V three-phase electrical service. This is not 480V single-phase, not 240V single-phase, and not residential 240V. It requires three-phase incoming power at 460V between phases. Confirm your service with your electrician before ordering.
- Who Has 460V Three-Phase: Heavy commercial and industrial facilities are typically wired for 460V (or 480V, which is within the tolerance range). Auto dealerships, large body shops, fleet garages, and manufacturing facilities in dedicated commercial buildings usually have 460V three-phase service. If your other heavy shop equipment — lifts, welders, CNC equipment — is labeled 460V or 480V three-phase, you have the right service.
- Why 460V Is More Efficient Than 230V: For the same 10 horsepower output, 460V three-phase draws approximately half the amperage of 230V three-phase. Lower amperage means smaller wire gauge, smaller breaker, less heat generated in your electrical system, and lower voltage drop over long wire runs from your panel to the compressor. If you are wiring a new shop or adding a new circuit, 460V is the electrically correct choice when your service supports it.
- 460V vs. 230V — Which to Buy: The decision is simple: match your compressor to your existing service voltage. If your shop is on 460V three-phase, buy the R1038HP75-460. If your shop is on 230V three-phase, buy the R1038HP75-230. Do not buy the wrong voltage and try to adapt it — the motor windings are wound for the specified voltage and cannot be safely reconfigured in the field.
- Dedicated Circuit Required: A 10HP motor at 460V still requires a properly sized dedicated circuit. Startup (locked-rotor) amperage is significantly higher than running amperage. Have your electrician calculate the correct breaker size, wire gauge, and disconnect for this motor's specifications. Do not share the circuit with other high-draw equipment.
80-Gallon Horizontal Tank — Details
- Tank Volume: At 80 gallons, this is a large receiver for a 10HP unit. More tank volume means longer run intervals before the compressor needs to cycle back on, more stored air available during demand peaks, and better system pressure stability across the shop.
- Horizontal Layout: The tank lies horizontally, keeping the overall machine height low. This is important in shops with ceiling clearance limitations, in rooms where a tall vertical tank would be impractical, or where a lower center of gravity is preferred for stability.
- Condensate Accumulation: Horizontal tanks collect water condensate at the lowest point of the tank. Compressed air always carries moisture, and that moisture condenses in the tank as air cools. You must drain the tank regularly — daily in humid climates or high-usage environments — to prevent rust and water contamination in your air lines. An automatic condensate drain valve installed at the low point is strongly recommended for production environments.
- Floor Footprint: Measure your available space. An 80-gallon horizontal compressor with the motor and screw assembly extends along one wall. Confirm the unit fits with adequate clearance on all sides for cooling airflow and service access before installation.
Who This Compressor Is For
- Auto Body and Collision Shops: 40 CFM at 100 PSI handles spray booth guns, DA sanders, and air-fed equipment running simultaneously. The continuous duty rating means you do not lose pressure mid-spray job because the compressor cycled off.
- Fleet Maintenance Facilities: Truck and bus fleets, construction equipment yards, and vehicle maintenance shops running impact wrenches and air tools across multiple bays throughout the day. 460V service is common in these facilities.
- Automotive Dealerships: Service department air supply for multiple technician bays. Dealerships with heavy commercial facilities are typically on 460V service.
- Tire and Alignment Centers: High-cycle impact tools and simultaneous multi-bay operation.
- Industrial and Light Manufacturing: Any production environment where pneumatic tools run continuously through a full shift on 460V three-phase service.
R1038HP75-460 vs. R1038HP75-230 — The Only Real Difference Is Voltage
- Same Performance Output: Both the -460 and -230 variants deliver the same air output from the same 10HP screw compressor and 80-gallon horizontal tank platform. The CFM and PSI ratings are the same. You are not getting more or less compressed air by choosing one voltage over the other.
- 460V Advantage: Lower amperage draw means more efficient use of your electrical infrastructure and lower heat in the wiring. If your shop is on 460V, this is the correct unit and there is no reason to step down to 230V.
- 230V Advantage: If your shop is already on 230V three-phase and adding 460V service or a transformer is not worth the cost, the R1038HP75-230 gets you the same compressor on your existing electrical infrastructure.
- Do Not Cross Voltages: These are not field-adjustable. Order the voltage that matches your service.
Technical Specifications
- Horsepower: 10 HP
- Phase: 3-Phase
- Voltage: 460V (fixed — 230V version is R1038HP75-230)
- CFM Output: 40 CFM at 100 PSI
- Tank Capacity: 80 Gallons
- Tank Orientation: Horizontal
- Drive Type: Rotary screw
- Duty Cycle: 100% continuous
- Model Number: R1038HP75-460
- Additional Specifications: Full manufacturer specifications including maximum operating pressure (PSI), motor full-load amperage at 460V, dimensions, and weight are pending. Contact 866-217-0063 for complete specifications before purchase.
Frequently Asked Questions
- Can I run this on single-phase 460V power? No. There is no such thing as single-phase 460V in North American commercial applications. This unit requires three-phase 460V service.
- Will this work on 480V service? 460V and 480V are often used interchangeably in the field — North American distribution systems nominally deliver 480V, which appears as 460V at the motor terminals after line losses. The motor is typically rated to handle this range. Confirm with Cast Air or contact us at 866-217-0063 for a definitive answer on your specific service voltage.
- How often does a rotary screw compressor need service? Oil-injected rotary screw compressors typically require oil and filter changes at specified intervals (commonly 1,000-2,000 hours depending on manufacturer), separator element replacement, and air filter service. This is less frequent and less labor-intensive than piston compressor valve and ring service. Full service intervals are in the manufacturer documentation.
- Is 40 CFM enough for a full spray booth? A single spray gun typically consumes 10-25 CFM at 40 PSI at the gun. Many booths also run air-fed respirators and additional tools. 40 CFM at 100 PSI is adequate for a single-gun booth with supporting equipment, but if you run multiple guns simultaneously or have a high-demand booth, evaluate whether you need more CFM. Call us and we can help you size correctly.
Why Buy From OEM Diagnostic Tools?
- Specialist Since 2016: We supply professional shops with diagnostic equipment and shop tools. We understand the air demands of production environments and can help you match compressor output to your actual usage.
- Free Shipping: Free freight shipping to the contiguous United States on this unit.
- Free Technical Support: Call 866-217-0063 before you order. We can help confirm that 460V three-phase is your service voltage, discuss whether 40 CFM meets your shop's demand, and compare this unit to other options in the Cast Air lineup.
- Full Manufacturer Warranty: Sold with Cast Air's full manufacturer warranty. We support warranty claims on every unit we sell.
- Honest Sizing Guidance: If 40 CFM is not enough for your application, or if this is more compressor than you need, we will tell you and point you to the right unit. We would rather sell you the correct compressor than the wrong one.
Call 866-217-0063 for quick answers and help!
