Castair 7.5 HP 3-Phase Rotary Screw Air Compressor — Vertical Tank, 460V (R738VP75-460)
The Castair R738VP75-460 is the 460V 3-phase configuration of the 7.5 HP vertical-tank rotary screw compressor. It delivers 31 CFM at 100 PSI on 100% duty cycle with an 80-gallon vertical ASME tank, footprint of 34 x 26 x 70 inches, and 546 lbs shipping weight. The 460V wiring is factory-installed — if your facility runs 460V 3-phase service, this is the correct model to order. Do not run a 230V motor on 460V service. Order the right voltage from the start and avoid motor damage.
Why 460V 3-Phase?
Many industrial facilities, body shops with heavy equipment, and manufacturing operations standardize on 460V 3-phase distribution because the higher voltage allows smaller wire gauges over long panel-to-equipment runs and reduces amperage draw on the distribution system. If your panel is more than 50 feet from the compressor location, 460V wiring will require a smaller, less expensive wire run compared to 230V at the same HP. If your facility already runs 460V 3-phase for other equipment, keeping everything on the same voltage simplifies electrical maintenance.
Air End and Drive System
- Duty cycle: 100% — continuous operation rated
- Air end: P75 rotary screw, single solenoid control — no computers, no lockout codes
- Motor: Heavy-duty industrial 1725 RPM, 15% service factor or higher, wound for 460V
- Drive: Off-shelf V-belts with adjustable belt tightener
- Lubrication: Factory-filled 4,000-hour / 1-year synthetic CAST-LUBE oil
- Oil filter: Spin-on automotive-type
- Air filter: Paper element (P75 series)
Controls and Safety
- Gauges: Pressure and temperature, easy-read standard
- Shutdowns: High pressure and dual high temperature standard
- 10-minute shutdown timer: Standard
- No lockout codes: Field-serviceable
Tank and Cooling
- Tank capacity: 80 gallons, vertical
- Tank certification: ASME (USA-made)
- Air/oil separator: Built-in spin-on filter
- Aftercooler: Air-cooled, removable for cleaning
- Plumbing: Off-shelf copper piping
Electrical
- Voltage: 460V, 3-phase
- Starter: Name-brand magnetic starter, factory mounted and wired for 460V
- 230V option: R738VP75-230
Maintenance
- Hour meter: Standard
- Filters: Spin-on oil and separator — no special tools
- Belt service: Off-shelf V-belts with adjustable tensioner
- PM kit: MKD3-4 — covers D3, D31, D4 air ends (5-10 HP range)
What Is in the Box
- Castair R738VP75-460 rotary screw compressor, fully assembled
- 80-gallon vertical ASME tank
- Air-cooled aftercooler and oil cooler
- Magnetic starter and controls, factory wired for 460V
- Hour meter
- Pressure and temperature gauges
- Factory fill CAST-LUBE synthetic oil
Vibration pads (VP1004), ball valve, and flex hose available factory-mounted or separately.
Available Configurations
- R738VP75-230 — Same unit, 230V 3-phase
- R738VP75-460 (this unit) — 460V 3-phase, 80 gal vertical, 31 CFM, 34x26x70, 546 lbs
- R738HP75-460 — Same specs, horizontal tank, 64x32x44
- R1038VP75 — 10 HP, 80 gal vertical, 40 CFM
- R15312VP75 — 15 HP, 120 gal vertical, 52 CFM, 765 lbs
When Does a Shop Need This vs. Stepping Up or Down?
Order this if: Your facility has 460V 3-phase and you need the vertical tank layout. Same output, same air end, same performance as the 230V version — only the electrical wiring differs.
Choose horizontal layout if: Your ceiling height is under 7 feet or moving a 70-inch tall unit into position is difficult.
Step up to 10 HP if: You regularly run three or more continuous air tools simultaneously.
Do not mix voltages: The 460V starter and motor are factory-matched. Do not attempt to adapt a 460V unit to 230V service.
Technical Specifications
- Model: R738VP75-460
- Horsepower: 7.5 HP
- Phase: 3-phase
- Voltage: 460V (230V available as R738VP75-230)
- CFM @ 100 PSI: 31
- Standard operating pressure: 135 PSI (150 or 175 PSI available)
- Duty cycle: 100%
- Tank size: 80 gallons, vertical
- Tank certification: ASME (USA-made)
- Dimensions (LxWxH): 34" x 26" x 70"
- Weight: 546 lbs
- Motor speed: 1725 RPM
- Motor service factor: 15% or higher
- Oil: CAST-LUBE synthetic, 4,000-hour / 1-year interval
- Warranty: 2 years on air end, motor, and tank
Why Buy From Air Compressor Factory Direct?
- Castair specialists: Full rotary screw lineup in both 230V and 460V
- Free shipping to commercial addresses
- Free tech support: 866-217-0063 — confirm voltage, sizing, and layout before you order
- Full 2-year warranty on air end, motor, and tank
- No guesswork: We will confirm the right voltage configuration for your electrical service
Call 866-217-0063 for quick answers and help!
