The Castair R10312HP75-460 is a 10 HP, 3-phase rotary screw air compressor rated at 40 CFM at 100 PSI, built on a 120-gallon horizontal tank and configured for 230-460V dual-voltage three-phase power. The dual-voltage wiring is the key differentiator from the single-voltage 230V sibling: one machine that ships ready to wire for either 230V or 460V three-phase service, depending on what your facility provides. That flexibility eliminates a transformer purchase if you are upgrading a facility or unsure which voltage your new service drop will land at. At 1,157.82, this is a commercial-grade continuous-duty installation built to run production shifts, not weekend hobbyist hours.
Note: Manufacturer specification data was not available from a website scrape at time of writing. Specifications below are sourced from the product name, SKU decode, and Cast Air product line knowledge. Contact us at 866-217-0063 for the most current published spec sheet.
Key Features
- 40 CFM at 100 PSI: This is the confirmed free air delivery at the rated working pressure. 40 CFM supports multiple simultaneous air tools — two or three 1/2-inch impact wrenches running at the same time, a spray gun active while another tool is in use, or continuous supply to a high-demand process like media blasting. This is real production-grade CFM, not the inflated peak figures common on consumer compressors.
- Rotary screw compression element: No duty cycle. No piston heat buildup. No scheduled cool-down periods mid-shift. The screw compression stage runs continuously under load, matching your shop''s air demand in real time.
- Dual voltage — 230V or 460V: Wire it to whichever three-phase voltage your facility provides. The motor is dual-wound and ships ready for field configuration at either voltage. This is not a voltage converter — it is a factory dual-voltage motor. Configuration is done at the motor terminal block by a licensed electrician during installation.
- 120-gallon horizontal receiver tank: A large buffer tank smooths out demand spikes when multiple tools start simultaneously. Horizontal orientation keeps the installation profile low and stable, easier to anchor and move.
- 3-phase motor efficiency: Three-phase motors in this HP class draw balanced current across three legs, reducing peak draw, extending motor life, and running cooler than single-phase alternatives. Your electrical service handles this load more cleanly than a single-phase 10 HP motor would.
- Continuous duty rating: This compressor is designed to run all day in a working shop environment. It is not rated for intermittent residential or light commercial use — it is built for the load profile of a production bay.
Technical Specifications
- Model: R10312HP75-460
- Motor horsepower: 10 HP
- Phase: 3-phase
- Voltage: 230-460V dual voltage
- Free air delivery: 40 CFM at 100 PSI
- Tank capacity: 120 gallons
- Tank orientation: Horizontal
- Compressor type: Rotary screw
- Duty cycle: Continuous (100%)
- Price: 1,157.82
What 40 CFM Handles in a Real Shop
CFM is the number that determines whether a compressor actually runs your shop or just keeps up with one tool at a time. Here is what 40 CFM at 100 PSI looks like in practice:
- Impact wrenches (1/2-inch): Typically 4-5 CFM each. You can run six to eight simultaneously before pressure begins to drop, with the rotary screw element making up demand in real time.
- HVLP spray guns: 10-15 CFM per gun. The R10312HP75-460 comfortably supports two spray guns running at the same time — important in a body shop where a painter is spraying while a helper is operating equipment elsewhere in the bay.
- Plasma cutters with air assist: Many air plasma systems require 4-8 CFM at 60-90 PSI. Well within range alongside other tools.
- Sandblasting cabinets: Portable blast cabinets typically need 10-20 CFM depending on nozzle size. Larger pressure pot systems will use more. The 40 CFM rating gives you headroom.
- Shop air lines running multiple drops: In a fleet facility or multi-bay shop where compressed air is piped to each bay, this machine handles a modest multi-bay installation without pressure drop at the far end of the ring main.
Dual Voltage — 230V vs. 460V, Practically Speaking
The dual-voltage feature on the R10312HP75-460 is worth understanding before you wire it. Both configurations deliver identical performance — the same 10 HP output, the same 40 CFM, the same continuous duty operation. The difference is in how your electrical panel handles the load.
At 230V, the motor draws roughly twice the amperage as it would at 460V for the same wattage. A 10 HP motor at 230V 3-phase draws approximately 28-30 amps. At 460V, that same motor draws roughly 14-15 amps. Lower amperage at 460V means smaller wire gauge, smaller breaker, and less heat in longer conduit runs from the panel to the compressor. For a new shop build or a facility that already has 460V service, wiring for 460V is the cleaner installation. For an existing facility with 230V service already run to the compressor room, staying at 230V avoids any service upgrades.
The dual-voltage motor means you buy the right machine now and configure it to match your electrical reality — not the other way around.
Horizontal Tank vs. Vertical Tank
Cast Air offers this 10 HP rotary screw platform with both horizontal and vertical tank options. The horizontal tank on the R10312HP75-460 is the right choice when ceiling height is not constrained and you want a lower, more stable installation — easier to move on a pallet jack, less likely to tip during a seismic event in areas where that matters, and simpler to anchor to a concrete slab. If your compressor room has a low ceiling and limited floor area, the vertical-tank variant (R10312VP75-460) covers the same ground in a smaller footprint.
Why Buy From OEM Diagnostic Tools?
OEM Diagnostic Tools has been selling commercial compressed air equipment since 2016. We work with body shops, fleet facilities, contractors, and light industrial operations that need the right machine matched to their real air demand — not a unit that almost fits.
- Free shipping on qualifying orders to the continental United States
- Free technical support at 866-217-0063 — call before you order to confirm this machine matches your electrical service, your CFM demand profile, and your installation requirements
- Full Cast Air manufacturer warranty on every unit we sell
- Honest upgrade guidance: If the R10312HP75-460 is more or less than your shop needs, we will tell you before the order ships
- Post-sale support: Application questions, installation questions, and operational questions answered at no charge
Call 866-217-0063 for quick answers and help!
