{"product_id":"castair-5-hp-3-phase-rotary-screw-air-compressor-20-cfm-at-100-psi-80-gal-horiz-tank-460-r538hp75","title":"Castair 5 HP 3 Phase Rotary Screw Air Compressor 20 Cfm At 100 Psi 80 Gal Horiz Tank 460 R538HP75","description":"\u003ch2\u003eCastair 5HP 3-Phase Rotary Screw Air Compressor 80 Gallon Horizontal 460V — R538HP75-460\u003c\/h2\u003e\n\n\u003cp\u003eThe Castair R538HP75-460 is a 5-horsepower, 3-phase, 460V, 80-gallon horizontal rotary screw air compressor delivering 20 CFM at 100 PSI. It weighs 470 pounds and measures 64×32×44 inches (L×W×H). Three-phase power means smoother motor starts, lower amperage per leg, and simpler motor construction than single-phase equivalents — if your shop has 3-phase service, use it. This unit is built around the P75 air end and is Castair's production-grade solution for 1-3 bay shops needing 100% duty cycle compressed air on 3-phase power.\u003c\/p\u003e\n\n\u003cp\u003e\u003cem\u003eP75 air end — maintenance kit MKP75 applies (covers 5-15HP with P75 element). If your facility runs 230V 3-phase, order the 230V variant instead.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003e3-Phase vs. Single-Phase at 5HP — Why It Matters\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower amperage per leg:\u003c\/strong\u003e A 5HP 3-phase motor distributes load across three legs. At 230V, expect approximately 13-15 amps per leg versus 25-30 amps for a single-phase 5HP motor. Smaller wire, smaller breaker, less heat in the circuit.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoother starts:\u003c\/strong\u003e 3-phase motors start under load without the large inrush current spike of single-phase motors. No voltage sag, no lights flickering when the compressor kicks on.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSimpler motor construction:\u003c\/strong\u003e 3-phase motors have no start capacitors, no centrifugal switches, fewer failure points.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e460V specific:\u003c\/strong\u003e 460V 3-phase is common in manufacturing facilities and industrial buildings. Draws approximately half the amperage per leg of the 230V equivalent — better for long wire runs from panel to compressor.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003e20 CFM at 100 PSI — Production Shop Capacity\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM output:\u003c\/strong\u003e 20 CFM @ 100 PSI (confirmed from Castair's published specifications)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/2-inch impact wrench:\u003c\/strong\u003e 4-8 CFM — two running simultaneously with capacity to spare\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3\/8-inch air ratchet:\u003c\/strong\u003e 4-6 CFM — multiple techs on ratchets simultaneously\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDA sander:\u003c\/strong\u003e 12-20 CFM — one sander at a time at this output level\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHVLP spray gun:\u003c\/strong\u003e 9-14 CFM — one gun, stable pressure\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1-inch impact:\u003c\/strong\u003e 10-25 CFM — intermittent use fine; sustained heavy use should step up to 7.5HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eGeneral shop tools, blow guns, inflation:\u003c\/strong\u003e Well within capacity\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eHorizontal Tank Configuration\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e 64×32×44\" (L×W×H) — 470 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLow profile:\u003c\/strong\u003e 44-inch height fits under most work surfaces and suits shops with lower ceilings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e64-inch floor length:\u003c\/strong\u003e Measure available wall space before committing to horizontal. You need roughly 64 inches of linear run plus service clearance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAlternative:\u003c\/strong\u003e R538VG11 or R538VP75 for the vertical configuration — same output, smaller floor footprint.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCastair Build Quality\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e100% duty cycle:\u003c\/strong\u003e Rotary screw design — runs continuously without thermal limitations of piston compressors.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCast iron construction throughout:\u003c\/strong\u003e Castair builds with cast iron. Not aluminum. Handles shop thermal cycles and long-term vibration.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial 1725 RPM motor, full 15% service factor:\u003c\/strong\u003e Commercial-grade motor built for sustained use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle solenoid air end control:\u003c\/strong\u003e No computers, no lockout codes, no proprietary diagnostics. Field-repairable by any competent tech.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAnalog pressure and temperature gauges standard:\u003c\/strong\u003e Read at a glance.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh pressure and dual high temperature shutdown standard:\u003c\/strong\u003e Protection built in — not an upsell option.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFactory-filled with Cast-Lube synthetic oil:\u003c\/strong\u003e 4,000-hour or one-year change interval.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in air\/oil separator with spin-on filter:\u003c\/strong\u003e Keeps oil out of the air supply. Standard spin-on replacement.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-shelf V-belts with adjustable tensioner:\u003c\/strong\u003e No proprietary parts. Buy replacements at any industrial supply.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir\/oil lines in copper pipe:\u003c\/strong\u003e Heat and vibration resistant. Standard plumbing fittings.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-cooled aftercooler\/oil cooler standard:\u003c\/strong\u003e Removable for cleaning. Reduces oil temperature and moisture carryover.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHour meter standard:\u003c\/strong\u003e Schedule maintenance by actual run hours.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10-minute auto shutdown timer:\u003c\/strong\u003e No air demand for 10 minutes, unit shuts off. Electricity savings in real use.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASME-rated 80-gallon tank:\u003c\/strong\u003e Code-compliant. Required for commercial insurance and inspection.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePre-wired magnetic starter and controls:\u003c\/strong\u003e Connect incoming 460V 3-phase power and run.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure options:\u003c\/strong\u003e 135 PSI standard, 150 or 175 PSI available.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2-year warranty on air end, electric motor, and tank\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eMade in Spicer, Minnesota\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Configurations — 5HP 3-Phase Lineup\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eR538HP75 \/ R538HP75-230:\u003c\/strong\u003e 5HP, 3-Phase 230V, 80 Gal Horizontal — 20 CFM @ 100 PSI — 64×32×44\" — 470 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR538VP75 \/ R538VP75-230:\u003c\/strong\u003e 5HP, 3-Phase 230V, 80 Gal Vertical — 20 CFM @ 100 PSI — 34×26×70\" — 470 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR538HP75-460:\u003c\/strong\u003e 5HP, 3-Phase 460V, 80 Gal Horizontal — 20 CFM @ 100 PSI — 470 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR538VP75-460:\u003c\/strong\u003e 5HP, 3-Phase 460V, 80 Gal Vertical — 20 CFM @ 100 PSI — 470 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR538HG11:\u003c\/strong\u003e 5HP, 3-Phase, 80 Gal Horizontal, G11 air end\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eR538VG11:\u003c\/strong\u003e 5HP, 3-Phase, 80 Gal Vertical, G11 air end\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up — R738HP75 \/ R738VP75:\u003c\/strong\u003e 7.5HP, 3-Phase, 80 Gal — 31 CFM @ 100 PSI — 546 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle-phase option:\u003c\/strong\u003e R518HP75 \/ R518VP75 — 5HP, 1-Phase — 20 CFM @ 100 PSI — 480 lbs\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhen Does a Shop Need This vs. Stepping Up or Down?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRight for:\u003c\/strong\u003e 3-phase shop, 1-3 bays, one primary tech running air tools steadily. The 20 CFM output handles sustained single-tech production without hesitation.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up to 7.5HP if:\u003c\/strong\u003e Two or more techs consistently run air tools simultaneously. 31 CFM @ 100 PSI covers the overlap. The 7.5HP unit is only slightly larger physically but delivers 55% more output.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eChoose 1-phase if:\u003c\/strong\u003e No 3-phase service available. The single-phase 5HP units (R518HP75\/VP75) deliver the same 20 CFM but draw more amperage per leg.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage confirmation:\u003c\/strong\u003e If your facility runs 230V 3-phase, order the 230V variant instead.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eG11 vs. P75 air end:\u003c\/strong\u003e Both deliver the same output. The air end determines which maintenance kit and filters apply. Confirm which you're ordering before buying PM supplies.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTechnical Specifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e R538HP75-460\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 5 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e 3-Phase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 460V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank:\u003c\/strong\u003e 80 gallon, horizontal, ASME-rated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir End:\u003c\/strong\u003e P75\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 100 PSI:\u003c\/strong\u003e 20\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions (L×W×H):\u003c\/strong\u003e 64×32×44\"\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e 470 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompressor Type:\u003c\/strong\u003e Rotary screw\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDuty Cycle:\u003c\/strong\u003e 100%\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStandard Pressure:\u003c\/strong\u003e 135 PSI (150 or 175 PSI optional)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Speed:\u003c\/strong\u003e 1725 RPM industrial, full 15% service factor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive:\u003c\/strong\u003e Belt drive, off-shelf V-belts with adjustable tensioner\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubrication:\u003c\/strong\u003e Oil-injected, Cast-Lube synthetic, 4,000-hour\/1-year interval\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControls:\u003c\/strong\u003e Single solenoid, pre-wired magnetic starter, analog gauges, hour meter, 10-minute auto shutdown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eShutdowns:\u003c\/strong\u003e High pressure, dual high temperature (standard)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaintenance Kit:\u003c\/strong\u003e MKP75\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 2-year on air end, electric motor, and tank\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Castair, Inc. (Spicer, Minnesota)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCastair rotary screw compressor (P75 air end) mounted on 80-gallon horizontal ASME tank\u003c\/li\u003e\n\u003cli\u003ePre-wired magnetic starter and controls for 460V 3-phase power\u003c\/li\u003e\n\u003cli\u003eAir\/oil separator with spin-on filter\u003c\/li\u003e\n\u003cli\u003eAir-cooled aftercooler\/oil cooler\u003c\/li\u003e\n\u003cli\u003eHour meter\u003c\/li\u003e\n\u003cli\u003ePre-filled with Cast-Lube synthetic oil\u003c\/li\u003e\n\u003cli\u003eAnalog pressure and temperature gauges installed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eRecommended Accessories\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003ePreventative Maintenance Kit (MKP75):\u003c\/strong\u003e 2 air filters, 4 oil filters, 1 separator filter, 5 gallons Cast-Lube synthetic oil — 10% savings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAuto Tank Drain SDV03M:\u003c\/strong\u003e Automatic condensate purging\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVibration Pads VP1004:\u003c\/strong\u003e 4\"×4\"×1\" set of 4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBall Valve BV75 (3\/4\"):\u003c\/strong\u003e Full-flow outlet shutoff\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal Flex Hose VA075 (3\/4\" NPT × 18\"):\u003c\/strong\u003e Vibration isolation between tank and shop plumbing\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCastair specialist:\u003c\/strong\u003e We know the 3-phase lineup, voltage variants, and the right accessories for each configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree shipping\u003c\/strong\u003e on qualifying orders\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFree technical support:\u003c\/strong\u003e Call 866-217-0063 — confirm your voltage, CFM needs, and tank orientation before ordering\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFull manufacturer warranty\u003c\/strong\u003e honored and supported\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHonest guidance:\u003c\/strong\u003e Tell us your setup and we'll confirm whether 5HP is right or if you need 7.5HP\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003cp\u003e\u003cstrong\u003eCall 866-217-0063 for quick answers and help!\u003c\/strong\u003e\u003c\/p\u003e","brand":"Cast Air","offers":[{"title":"Default Title","offer_id":53342582603989,"sku":"R538HP75-460","price":18796.54,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0622\/8466\/0949\/files\/Logo1_c59717cc-8093-45e4-8ed9-f20ef70bab81.webp?v=1772652843","url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-5-hp-3-phase-rotary-screw-air-compressor-20-cfm-at-100-psi-80-gal-horiz-tank-460-r538hp75","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}