{"product_id":"castair-7hp-3-phase-industrial-air-compressor-horizontal-tank-i733hc2","title":"Castair 7HP 3-Phase Industrial Air Compressor  Horizontal Tank - I733HC2","description":"\u003cp\u003eThe Castair I733HC2 is a 7.5 HP, 3-phase industrial air compressor on a 30-gallon horizontal ASME tank with the C2 pump — sold without the factory-mounted magnetic motor starter. This is the base unit for shops that already have a starter panel in place, prefer to use their own overload protection, or want to spec their own controls independently. The compressor itself — pump, motor, tank, and drive — is identical to the I733HC2-S. The only difference is the magnetic starter is not included here.\u003c\/p\u003e\n\n\u003cp\u003eThe C2 pump runs at 585 RPM, producing 35.0 CFM at 0 PSI and 28.1 CFM at 175 PSI. It's a two-stage, V4 cast iron pump — heavier displacement than the C1, with a lower shaft speed that keeps heat and wear in check over a long service life. If you need the higher CFM of the C2 pump but your electrician or shop manager prefers to handle the motor controls separately, the I733HC2 without the starter is the correct choice.\u003c\/p\u003e\n\n\u003ch2\u003eStarter vs. No Starter — What the -S Suffix Means\u003c\/h2\u003e\n\u003cp\u003eIn Castair's industrial lineup, the \u003cstrong\u003e-S\u003c\/strong\u003e suffix means the magnetic motor starter is factory-mounted and wired to the unit. When you see a model without that suffix (like I733HC2), the starter is not included. This matters for a few reasons:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-phase motors require overload protection:\u003c\/strong\u003e You will need a magnetic motor starter. If you buy the I733HC2, you'll source and mount your own starter — either a Castair unit or equivalent sized for 7.5HP, 3-phase at your voltage (208\/230V or 460V)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eExisting panel:\u003c\/strong\u003e Some shops have a compressor panel or motor control center already in place. Buying without the factory starter avoids paying for a duplicate\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWiring flexibility:\u003c\/strong\u003e Without the pre-mounted starter, your electrician has more flexibility in how they run conduit and position the disconnect\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eIf you're not sure whether to order with or without the starter, call us. We'll ask about your electrical service and walk you through the right choice.\u003c\/p\u003e\n\n\u003ch3\u003ePump Features — Cast Iron C2 Two-Stage V4\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eAll cast iron V4 cylinder configuration:\u003c\/strong\u003e Four cylinders in a V arrangement — more displacement and higher CFM than the C1 inline-2, at lower shaft speed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSlow 585 RPM operation:\u003c\/strong\u003e Lower heat, less wear, quieter operation than faster-turning pumps\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTapered roller bearings at both crankshaft ends:\u003c\/strong\u003e Superior support for two-stage compression loads and belt-drive side loads\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePrecision steel connecting rods:\u003c\/strong\u003e Automotive-type insert bearings at crankshaft, needle bearings at wrist pin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDisc and spring valves:\u003c\/strong\u003e Field-serviceable, reliable under sustained pressure cycling\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e4-ring pistons:\u003c\/strong\u003e Lower oil carry-over into the discharge air stream\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCentrifugal unloader:\u003c\/strong\u003e No-load start on every cycle — pressure is released before the motor cranks up\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eTank and Frame Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e30-gallon horizontal ASME-rated tank:\u003c\/strong\u003e Powder coated, channel-base horizontal configuration\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eASME safety valve:\u003c\/strong\u003e Factory installed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMetal belt guard:\u003c\/strong\u003e Fully enclosed\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCopper discharge and unloader tube:\u003c\/strong\u003e Handles heat and pressure cycling better than rubber or plastic\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eMotor\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e1,725 RPM heavy-duty industrial motor:\u003c\/strong\u003e Full 15% service factor — designed for continuous shop duty\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e3-phase:\u003c\/strong\u003e Requires magnetic starter for overload protection (not included — see I733HC2-S for the starter-included version)\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhat's in the Box\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCastair I733HC2 compressor assembly (C2 pump, motor, 30-gal horizontal tank, belt drive, belt guard)\u003c\/li\u003e\n\u003cli\u003eASME safety valve (installed)\u003c\/li\u003e\n\u003cli\u003eCopper discharge and unloader tube (installed)\u003c\/li\u003e\n\u003cli\u003ePressure switch (installed)\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003eMagnetic motor starter not included — order I733HC2-S for the starter-included version\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eAvailable Configurations — 7.5HP 3-Phase Industrial Lineup\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eI733HC1-S:\u003c\/strong\u003e 7.5HP, 3-phase, 30-gal horizontal, C1 pump, 895 RPM, 24.8 CFM@175PSI, magnetic starter included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI733HC2-S:\u003c\/strong\u003e 7.5HP, 3-phase, 30-gal horizontal, C2 pump, 585 RPM, 28.1 CFM@175PSI, magnetic starter included\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI733HC2 (this unit):\u003c\/strong\u003e 7.5HP, 3-phase, 30-gal horizontal, C2 pump, 585 RPM, 28.1 CFM@175PSI, no starter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI738HC2-S:\u003c\/strong\u003e 7.5HP, 3-phase, 80-gal horizontal, C2 pump, 585 RPM, 28.1 CFM@175PSI — 64x20x46 in., 730 lbs, starter included\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch2\u003eWhen Does a Shop Need This vs. Stepping Up or Down\u003c\/h2\u003e\n\u003cp\u003e\u003cstrong\u003eChoose the I733HC2\u003c\/strong\u003e when you need the C2 pump's higher CFM output (28.1 CFM@175PSI), already have motor controls in your shop's panel, and don't need or want a factory-mounted starter. This is common in shops that run multiple compressors from a central control panel or where the electrical contractor handles the motor control separately.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eBuy the I733HC2-S instead\u003c\/strong\u003e if you don't have existing motor controls — the factory starter is cleaner, saves field labor, and ensures the overload protection is correctly sized for this motor from day one.\u003c\/p\u003e\n\n\u003cp\u003e\u003cstrong\u003eStep up to I738HC2-S\u003c\/strong\u003e for an 80-gallon tank — more reserve air for sustained spray painting, sandblasting, or multi-bay operations.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical Specifications\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e I733HC2\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eHorsepower:\u003c\/strong\u003e 7.5 HP\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePhase:\u003c\/strong\u003e 3-phase\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Capacity:\u003c\/strong\u003e 30 gallons\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTank Type:\u003c\/strong\u003e Horizontal, ASME-rated, powder coated\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Model:\u003c\/strong\u003e C2 (two-stage, cast iron, V4)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump RPM:\u003c\/strong\u003e 585\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 0 PSI:\u003c\/strong\u003e 35.0\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCFM @ 175 PSI:\u003c\/strong\u003e 28.1\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMax Working Pressure:\u003c\/strong\u003e 175 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMotor Speed:\u003c\/strong\u003e 1,725 RPM\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Stage:\u003c\/strong\u003e Two-stage\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePump Cylinder Configuration:\u003c\/strong\u003e V4\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eStarter:\u003c\/strong\u003e Not included (see I733HC2-S for starter-included version)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDischarge Tube:\u003c\/strong\u003e Copper\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBelt Guard:\u003c\/strong\u003e Metal, fully enclosed\u003c\/li\u003e\n\u003c\/ul\u003e\n\n\u003ch3\u003eWhy Buy From Air Compressor Factory Direct?\u003c\/h3\u003e\n\u003cp\u003eWe specialize in Castair industrial compressors and know this lineup thoroughly. If you're unsure whether to buy with or without the starter, or whether the C1 or C2 pump is right for your shop's CFM requirements, call us. We've been matching shops to the right compressor since 2016. Free shipping, free tech support, full manufacturer warranty. No sales pressure — just honest answers.\u003c\/p\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":53342569201877,"sku":"I733HC2","price":7283.18,"currency_code":"USD","in_stock":true}],"url":"https:\/\/aircompressorfactorydirect.com\/products\/castair-7hp-3-phase-industrial-air-compressor-horizontal-tank-i733hc2","provider":"Air Compressor Factory Direct","version":"1.0","type":"link"}