{"product_id":"castair-air-compressor-pressure-switch","title":"Castair Air Compressor Pressure Switch","description":"\u003cdiv style=\"font-family: Arial, sans-serif; font-size: 15px; line-height: 1.7; color: #222; max-width: 900px; margin: 0 auto;\"\u003e\n\u003ch2 style=\"font-size: 24px; font-weight: bold; color: #000;\"\u003eCastair Air Compressor Pressure Switch — 95-125 \/ 145-175 \/ 15-230 PSI, UL\/CSA Listed\u003c\/h2\u003e\n\u003cp\u003eThe pressure switch is what tells your compressor when to run and when to stop — cutting power to the motor when the tank reaches cut-out pressure and restarting it at cut-in. These genuine Castair switches are UL\/CSA listed, easy to adjust, and built with corrosion-resistant covers for long service life. Available in low-pressure (95-125 PSI), high-pressure (145-175 PSI), and wide-range adjustable (15-230 PSI) versions, with or without an unloader, on\/off lever, and four-way porting. Supplied by Castair, a family-owned Minnesota manufacturer since 1991.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhy It's Different:\u003c\/strong\u003e Match the switch to how your compressor runs. The \u003cstrong\u003ePSI range\u003c\/strong\u003e should bracket your operating pressure — 95-125 for most single-stage units, 145-175 for two-stage 175 PSI compressors, or the adjustable 15-230 for custom setups. The \u003cstrong\u003eunloader\u003c\/strong\u003e versions bleed head pressure off the pump so the motor restarts under no load (most belt-drive compressors need this), the \u003cstrong\u003eon\/off lever\u003c\/strong\u003e adds manual control, and the \u003cstrong\u003efour-way\u003c\/strong\u003e versions simplify plumbing. A separate unloader valve (PSUV) is also available as a replacement part.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eBest For:\u003c\/strong\u003e Replacing a failed or worn pressure switch, building or repairing a compressor, or completing a tankless Cube power unit (which requires a pressure switch to operate).\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eConfiguration:\u003c\/strong\u003e Choose your PSI range and features — low (95-125), high (145-175), or adjustable (15-230), with the unloader \/ on-off \/ four-way combination your setup needs.\u003c\/p\u003e\n\u003cp style=\"border: 1px solid #d00; padding: 10px; background: #fff8f8;\"\u003e\u003cstrong\u003e⚠️ BEFORE YOU ORDER — PLEASE READ:\u003c\/strong\u003e \u003cbr\u003e• \u003cstrong\u003eMatch the PSI range\u003c\/strong\u003e to your compressor's operating pressure (e.g., a 175 PSI two-stage unit needs a 145-175 switch). \u003cbr\u003e• \u003cstrong\u003eUnloader:\u003c\/strong\u003e most belt-drive compressors require an unloader version for proper restart — confirm whether your setup needs one. \u003cbr\u003e• \u003cstrong\u003eElectrical:\u003c\/strong\u003e the switch's voltage\/amp rating must match your motor; wiring should be done by a qualified person to local code. \u003cbr\u003eIt is the customer's responsibility to verify pressure range, unloader requirement, and electrical compatibility before purchase and installation.\u003c\/p\u003e\n\u003ch3\u003eFeatures\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eUL\/CSA listed\u003c\/strong\u003e for safety and compliance\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCorrosion-resistant covers\u003c\/strong\u003e for long service life\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEasy to adjust\u003c\/strong\u003e cut-in \/ cut-out settings\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eThree pressure ranges\u003c\/strong\u003e — 95-125, 145-175, and adjustable 15-230 PSI\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWith or without unloader\u003c\/strong\u003e for load-less restart\u003c\/li\u003e\n\u003cli\u003e\u003cstrong\u003eOptional on\/off lever and four-way porting\u003c\/strong\u003e\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eAdjustable-differential version\u003c\/strong\u003e (PSAD15-230) for custom setups\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRequired component\u003c\/strong\u003e for tankless Cube power units\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"background-color: #000; color: #fff; text-align: left; padding: 10px; font-size: 15px;\" colspan=\"3\"\u003eCastair Pressure Switches — UL\/CSA Listed\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003ePart #\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003ePSI On\/Off\u003c\/th\u003e\n\u003cth style=\"padding: 8px; border: 1px solid #ddd; background: #f3f3f3; text-align: left;\"\u003eDescription\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSL1\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e95-125\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eNo unloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSL1X\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e95-125\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eWith unloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSL1MIX\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e95-125\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eWith unloader \u0026amp; on\/off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSL4MIX\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e95-125\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eWith unloader, on\/off \u0026amp; four-way\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSH1\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e145-175\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eNo unloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSH1X\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e145-175\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eWith unloader\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSH1MIX\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e145-175\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eWith unloader \u0026amp; on\/off\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSH4MIX\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e145-175\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eWith unloader, on\/off \u0026amp; four-way\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSAD15-230\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e15-230\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eNo unloader, adjustable differential\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePSUV\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e—\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003ePressure switch unloader valve (replacement part)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003ctable style=\"width: 100%; border-collapse: collapse; margin-top: 14px;\"\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\n\u003cth style=\"background-color: #000; color: #fff; text-align: left; padding: 10px; font-size: 15px;\" colspan=\"2\"\u003eShared Specifications\u003c\/th\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"width: 40%; padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eManufacturer\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eCastair (Spicer, Minnesota — family-owned since 1991)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eType\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eAir compressor pressure switch\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003ePressure Ranges\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003e95-125, 145-175, and 15-230 PSI (adjustable)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eOptions\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eUnloader, on\/off lever, four-way porting\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eCover\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eCorrosion-resistant\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eCertification\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eUL\/CSA listed\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd; font-weight: bold;\"\u003eBrand\u003c\/td\u003e\n\u003ctd style=\"padding: 8px; border: 1px solid #ddd;\"\u003eCastair\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e\u003cstrong\u003eWhat's Included\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eOne (1) Castair pressure switch per the model selected (or unloader valve for PSUV)\u003c\/li\u003e\n\u003cli\u003e\u003cem\u003e(Switch only — wiring, fittings, and tubing not included. Match the PSI range and unloader configuration to your compressor. Contact us to confirm fitment.)\u003c\/em\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eManuals \u0026amp; Documentation\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"#\"\u003eCastair Pressure Switch Wiring \u0026amp; Adjustment Guide (PDF)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"CastAir","offers":[{"title":"95–125 PSI – No Unloader","offer_id":45140742471795,"sku":"PSL1","price":36.66,"currency_code":"USD","in_stock":true},{"title":"95–125 PSI – With Unloader","offer_id":45140742504563,"sku":"PSL1X","price":40.56,"currency_code":"USD","in_stock":true},{"title":"95–125 PSI – Unloader + On\/Off","offer_id":45140742537331,"sku":"PSL1MIX","price":41.34,"currency_code":"USD","in_stock":true},{"title":"95–125 PSI – Unloader + On\/Off + Four-Way","offer_id":45140742570099,"sku":"PSL4MIX","price":49.14,"currency_code":"USD","in_stock":true},{"title":"145–175 PSI – No Unloader","offer_id":45140742602867,"sku":"PSH1","price":36.66,"currency_code":"USD","in_stock":true},{"title":"145–175 PSI – With Unloader","offer_id":45140742635635,"sku":"PSH1X","price":40.56,"currency_code":"USD","in_stock":true},{"title":"145–175 PSI – Unloader + On\/Off","offer_id":45140742668403,"sku":"PSH1MIX","price":41.34,"currency_code":"USD","in_stock":true},{"title":"145–175 PSI – Unloader + On\/Off + Four-Way","offer_id":45140742701171,"sku":"PSH4MIX","price":49.14,"currency_code":"USD","in_stock":true},{"title":"15–230 PSI – Adjustable Differential","offer_id":45140742733939,"sku":"PSAD15-230","price":243.36,"currency_code":"USD","in_stock":true},{"title":"Unloader Valve (replacement part)","offer_id":45140742766707,"sku":"PSUV","price":20.28,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0698\/3650\/5203\/files\/AirCompressorPressureSwitch.webp?v=1782750030","url":"https:\/\/bluecollarplanet.com\/products\/castair-air-compressor-pressure-switch","provider":"Blue Collar Planet","version":"1.0","type":"link"}