{"product_id":"castair-3hp-rotary-screw-base-mount-compressor-r33bmp50-23","title":"Castair 3HP Rotary Screw Base Mount Compressor - R33BMP50-23","description":"\u003ch2\u003eCastair 3HP 3-Phase Rotary Screw Base Mount Compressor — R33BMP50-23\u003c\/h2\u003e\n\n\u003cp\u003eThe Castair R33BMP50-23 is a 3-horsepower, 3-phase, 230-volt rotary screw compressor in base mount configuration — meaning the compressor assembly ships without a tank, intended to be mounted to your existing receiver. If your shop already has a working receiver tank and you're looking to replace a tired piston pump with a continuous-duty rotary screw, this is the unit. Three-phase 230V operation means smoother motor starts, lower amp draw compared to equivalent single-phase motors, and better longevity in a commercial setting where 3-phase power is available.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eNote: Detailed specifications for the R33BMP50-23 were not listed individually on Castair's website at time of writing. The information below is based on Castair's confirmed rotary screw product line and standard base mount specifications. Contact us at 866-217-0063 for current data sheet.\u003c\/strong\u003e\u003c\/p\u003e\n\n\u003ch3\u003e3-Phase vs. Single-Phase: Why It Matters in a Shop Setting\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eSmoother starts:\u003c\/strong\u003e 3-phase motors start under load without the voltage sag that can trip breakers or dim lights on single-phase circuits. If you have 3-phase service, use it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLower amp draw for same horsepower:\u003c\/strong\u003e A 3HP 3-phase motor draws significantly less amperage than a 3HP single-phase motor. Smaller wire runs, smaller breaker, less heat.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLonger motor life:\u003c\/strong\u003e Three-phase motors have simpler windings with no start capacitors to fail. In a production environment, this translates to fewer service interruptions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e230V vs. 460V:\u003c\/strong\u003e The R33BMP50-23 is wired for 230V 3-phase. If your panel runs 460V 3-phase, look at the 460V variant. Confirm your panel voltage before ordering.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eBase Mount Configuration — Flexible Installation\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eNo tank included:\u003c\/strong\u003e This unit is the compressor assembly only — air end, motor, belt drive, controls, and base frame. You provide the receiver tank.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMount to existing tank:\u003c\/strong\u003e Ideal for replacing a worn piston compressor head while keeping a serviceable receiver in place.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRemote mounting:\u003c\/strong\u003e If your shop layout puts the compressor in one location and the tank in another, a base mount unit with copper piping between them is a clean solution.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e50-gallon receiver sizing:\u003c\/strong\u003e At 3HP output, a 50-gallon tank provides adequate buffer for intermittent demand. For continuous heavy use, a larger tank reduces cycling frequency.\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eCastair Build Quality — What You're Getting\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCast iron construction throughout:\u003c\/strong\u003e Castair builds with cast iron — not aluminum heads. Handles thermal cycling and vibration in real shop conditions.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIndustrial 1725 RPM motor with 15% service factor:\u003c\/strong\u003e Runs cool, lasts longer than consumer-grade motors. Full service factor means it handles the occasional heavy demand without overheating.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSingle solenoid air end control:\u003c\/strong\u003e No computers, no lockout codes. A solenoid either opens or closes. When something fails, any competent technician can diagnose and repair it.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure and temperature gauges standard:\u003c\/strong\u003e Analog. Readable at a glance. No menu navigation required.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHigh pressure and dual high temperature shutdown:\u003c\/strong\u003e Protects the air end from overheat and the system from overpressure. Standard protection, not an 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. Ships ready to run.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBuilt-in air\/oil separator with spin-on filter:\u003c\/strong\u003e Keeps oil carryover out of your lines. Standard spin-on replacement — not proprietary.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOff-shelf V-belts with adjustable tensioner:\u003c\/strong\u003e Standard belts. Order replacements at any industrial supply, not through a factory parts department.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir\/oil lines in copper pipe:\u003c\/strong\u003e Not plastic hose. Copper handles heat and vibration. Fittings are standard plumbing hardware.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAir-cooled aftercooler\/oil cooler standard:\u003c\/strong\u003e Removable for cleaning. Keeps oil temps stable, reduces moisture in the air stream.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHour meter standard:\u003c\/strong\u003e Know exactly when maintenance is due based on actual run hours.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e10-minute auto shutdown timer:\u003c\/strong\u003e No demand for 10 minutes, the unit shuts off. Saves electricity during slow periods.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePressure options:\u003c\/strong\u003e 135 PSI standard. Can be ordered at 150 or 175 PSI.\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003e2-year warranty on air end, electric motor\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eAvailable Configurations — 3-Phase Rotary Screw Lineup\u003c\/h3\u003e\n\u003cp\u003eThe R33BMP50-23 is the 3-phase 230V base mount entry. Related models with tanks:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e5HP, 3-Phase, 80 Gal Vertical (R538VP75):\u003c\/strong\u003e 20 CFM @ 100 PSI — 470 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e5HP, 3-Phase, 80 Gal Horizontal (R538HP75):\u003c\/strong\u003e 20 CFM @ 100 PSI — 470 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7.5HP, 3-Phase, 80 Gal Vertical (R738VP75):\u003c\/strong\u003e 31 CFM @ 100 PSI — 546 lbs\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e7.5HP, 3-Phase, 80 Gal Horizontal (R738HP75):\u003c\/strong\u003e 31 CFM @ 100 PSI — 546 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 Small shop with 3-phase power, existing receiver tank, and light-to-moderate air demand. One tech running air tools intermittently — tire shop, small repair bay, service department.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStep up to 5HP if:\u003c\/strong\u003e You're running multiple air tools simultaneously or your demand is continuous. The 5HP 3-phase unit (R538VP75\/HP75) delivers 20 CFM @ 100 PSI — noticeably more headroom for production work.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBase mount is right when:\u003c\/strong\u003e You have a functional tank and need a better compressor head. Don't pay for a tank you don't need.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCheck your voltage first:\u003c\/strong\u003e 230V 3-phase and 460V 3-phase are not interchangeable. Know your panel before ordering.\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 R33BMP50-23\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 3 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 230V\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Base mount (no tank)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSuggested Receiver:\u003c\/strong\u003e 50 gallon\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 available)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eLubrication:\u003c\/strong\u003e Oil-injected, synthetic lubricant\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDrive:\u003c\/strong\u003e Belt drive, standard V-belts\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Speed:\u003c\/strong\u003e 1725 RPM industrial motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eControls:\u003c\/strong\u003e Single solenoid, pre-wired magnetic starter, hour meter, 10-minute auto shutdown\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWarranty:\u003c\/strong\u003e 2-year on air end and electric motor\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Castair (Spicer, Minnesota)\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eDetailed CFM, dimensions, and weight pending manufacturer confirmation. Call for current spec sheet.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhat's in the Box\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eCastair rotary screw compressor assembly (air end, motor, belt drive, base frame)\u003c\/li\u003e\n\u003cli\u003ePre-wired magnetic starter and controls (just connect 3-phase 230V 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\u003c\/ul\u003e\n\u003cp\u003e\u003cem\u003eTank not included. 50-gallon receiver sold separately.\u003c\/em\u003e\u003c\/p\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eCastair specialists:\u003c\/strong\u003e We know the lineup — base mounts, voltage configurations, tank sizing, maintenance kits\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 — talk to someone who understands 3-phase installations and rotary screw systems\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 Not sure if this is the right unit? We'll help you figure out what your shop actually needs\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":53342581194965,"sku":"R33BMP50-23","price":0.0,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-3hp-rotary-screw-base-mount-compressor-r33bmp50-23","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}