Castair Motor — 30 HP, 3-Phase, 208/230/460V, 286T Frame, 1725 RPM (30-286-3)
The Castair 30-286-3 is a 30 horsepower, three-phase industrial motor in a 286T NEMA frame, designed for large-capacity reciprocating air compressor applications. At $2,712.29, this is not a routine maintenance item — it is a major drive component for a serious industrial compressor installation. The tri-voltage design (208/230/460V) means it can be configured for most three-phase industrial power supplies. If the motor on your Castair large-frame compressor has failed, this is the OEM replacement.
Manufacturer page data was not available for this listing. Specifications are drawn from the product name and standard industrial motor nomenclature. Call 866-217-0063 before ordering — at this price point, confirming exact specs and fitment is essential.
Motor Specifications Explained
Full Nameplate Data
- Part Number: 30-286-3
- Horsepower: 30 HP
- Voltage: 208/230/460V three-phase (tri-voltage)
- Phase: 3-phase
- Service Factor: 1.15 — the motor can be continuously operated at 15% above its rated HP (34.5 HP) without damage under correct conditions
- Amp Draw: 76A at 208V / 72A at 230V / 36A at 460V — use these values to size your starter, breaker, and wire gauge
- NEMA Frame: 286T — a large frame, indicating a substantial physical motor. The "T" suffix denotes the current NEMA frame standard.
- Speed: 1725 RPM — standard 4-pole motor speed on 60Hz power (synchronous: 1800 RPM; rated speed under load: 1725 RPM)
- Shaft Diameter: 1 7/8 inches — a large shaft appropriate for the torque output of a 30 HP motor
- Weight: 380 lbs — plan your installation accordingly; this motor requires a hoist or engine crane for safe handling
- Price: $2,712.29
Understanding the 286T Frame
- NEMA 286T frame defines specific mounting dimensions: shaft height, mounting hole pattern, and shaft length
- Shaft height (center of shaft to base): 7.125 inches
- The replacement motor must be a 286T frame to bolt into the existing motor base — a different frame will not fit without fabricating a new motor base
- Confirm whether your compressor uses foot-mount (frame) or flange-mount (C-face or D-face) motor mounting before ordering
What Shops Run 30 HP Compressor Systems
Applications and Users
- Heavy-duty auto and truck shops: Fleet maintenance facilities, truck dealerships, and heavy equipment shops that run multiple air tools simultaneously at high duty cycles
- Body shops with large spray booths: Paint spray requires clean, dry, high-volume air — a 30 HP system can supply multiple booths
- Industrial manufacturing: Assembly lines, pneumatic automation, blast cabinets, and other continuous-duty air consumers
- Tire and service centers: High-volume tire shops and quick-lube facilities with continuous air demand
Before You Order
- Confirm your supply voltage: 208V, 230V, and 460V installations use different starter and wire specifications even with a tri-voltage motor — the motor wiring must be configured for the supply voltage
- Verify amp capacity: At 76A (208V) or 36A (460V), confirm your panel, disconnect, and wire runs are sized for this load
- Check rotation: Most compressor pumps require a specific motor rotation direction — verify before installation
- Inspect the drive: A failed motor may have also damaged the drive belt, flywheel, and pump bearings — inspect all components before restarting the system with a new motor
What's in the Box
- 1x Castair 30 HP, 3-phase, 208/230/460V motor, 286T frame, 1725 RPM, 1-7/8" shaft
- Motor wiring diagram (typically attached to motor terminal box)
- Note: Starter, pulleys, belts, and mounting hardware are not included
Technical Specifications
- Part Number: 30-286-3
- Horsepower: 30 HP
- Voltage: 208/230/460V
- Phase: 3-phase
- Service Factor: 1.15
- Full Load Amps: 76 / 72 / 36 (208V / 230V / 460V)
- NEMA Frame: 286T
- Speed: 1725 RPM
- Shaft Diameter: 1-7/8 inches
- Weight: 380 lbs
- Price: $2,712.29
Why Buy From OEM Diagnostic Tools?
- Specialist since 2016 in industrial air compressor components — we stock and supply large-frame motors and major components
- Free shipping on qualifying orders — we will coordinate freight shipping for a motor this size
- Free tech support at 866-217-0063 — please call before ordering this motor. At $2,712, confirming the exact frame, voltage, and shaft spec is the right move. We would rather spend 10 minutes on the phone than process a return on a 380-pound motor.
- Full manufacturer warranty on Cast Air motors
- Honest guidance: We will tell you if a different motor spec is a better fit for your application
Call 866-217-0063 for quick answers and help!
