{"product_id":"telemecanique-sensors-air-compressor-pressure-switch-175-psi-set-off","title":"Air-Compressor Pressure Switch 175 psi Set-Off, 40 psi Differential","description":"\u003cp\u003eIn this review of the Air-Compressor Pressure Switch, the reviewer finds it best suited for workshop and light industrial users who need a straightforward, low HP control for air or water systems. The single biggest reason to buy is its reliable mechanical design: a diaphragm actuator with a fixed differential and screw clamp terminals that make installation and repeatable pressure cut-out at 175 psi simple and dependable for motors and compressors. This review examines build, features, and practical use so you can decide if it fits your compressor maintenance setup.\u003c\/p\u003e\u003ch2\u003eKey Features\u003c\/h2\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003e175 psi set-off:\u003c\/strong\u003e Provides a clear, factory-set cut-out at 175 psi so compressors stop at a predictable pressure to protect the system.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e40 psi fixed differential:\u003c\/strong\u003e Supplies a consistent off-to-on gap so the restart pressure is about 40 psi below the cut-out, reducing guesswork when adjusting cycles.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDPST-DB contacts:\u003c\/strong\u003e Two normally closed, snap-action contacts give reliable electrical control for motors with double-break switching for improved contact life.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003e1\/4 in NPT external port:\u003c\/strong\u003e Standard fluid connection makes plumbing to compressors or water lines straightforward without adapters in many setups.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDiaphragm actuator and polypropylene enclosure:\u003c\/strong\u003e A diaphragm actuator that can be mounted in any position and a corrosion-resistant enclosure for long service in workshop environments.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCompact footprint:\u003c\/strong\u003e Small physical size and light package weight make it easy to integrate into existing compressor control assemblies.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eWho It's For\u003c\/h2\u003e\u003cp\u003eThe switch is ideal for hobbyist mechanics, small shop owners, and maintenance techs who need a dependable pressure control for small air compressors or water pressure systems. Its low HP rating and simple mechanical design suit systems where rugged, repeatable switching is more important than electronic features.\u003c\/p\u003e\u003cp\u003eThose needing microprocessor control, adjustable electronic differentials, or factory presets outside the 100 to 200 psi rising range should look elsewhere. Also, larger industrial compressors with higher electrical load requirements will need a switch rated for higher HP or additional contactors.\u003c\/p\u003e\u003ch2\u003ePros \u0026amp; Cons\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003ePros\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eSolid mechanical design with a diaphragm actuator for reliable operation in any position.\u003c\/li\u003e\n\u003cli\u003eClear pressure settings with 175 psi set-off and about 40 psi fixed differential for predictable cycling.\u003c\/li\u003e\n\u003cli\u003eStandard 1\/4 in NPT external fluid connection and screw clamp terminals simplify installation.\u003c\/li\u003e\n\u003cli\u003eCompact size and light weight make retrofit straightforward in tight control boxes.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cstrong\u003eCons\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eThe switch has a fixed mechanical differential and limited adjustability compared to electronic controllers.\u003c\/li\u003e\n\u003cli\u003eNot intended for high HP motor switching without additional contactors or relays.\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch2\u003eSpecifications\u003c\/h2\u003e\u003ctable\u003e\n\u003ctr\u003e\n\u003ctd\u003eBrand\u003c\/td\u003e\n\u003ctd\u003eTelemecanique Sensors\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eSet-off Pressure\u003c\/td\u003e\n\u003ctd\u003e175 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFixed Differential\u003c\/td\u003e\n\u003ctd\u003eApproximately 40 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eContact Form\u003c\/td\u003e\n\u003ctd\u003e2 NC, snap action DPST-DB\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eFluid Connection\u003c\/td\u003e\n\u003ctd\u003e1\/4 in NPT external\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eAdjustable Range\u003c\/td\u003e\n\u003ctd\u003eRising pressure 100 psi to 200 psi\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003eEnclosure \/ Size\u003c\/td\u003e\n\u003ctd\u003ePolypropylene; approx 2.78 in W x 3.76 in D x 3.92 in H\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr\u003e\n\u003ctd\u003ePackage Weight\u003c\/td\u003e\n\u003ctd\u003e0.82 lb\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/table\u003e\u003ch2\u003eOur Verdict\u003c\/h2\u003e\u003cp\u003eThe Air-Compressor Pressure Switch is a sensible choice for small shops and DIYers who want a dependable mechanical pressure control with a 175 psi cut-out and a fixed 40 psi differential. It is good value when you need straightforward, repeatable switching without electronic complexity, provided the motor load is within the switch's low HP capability or an external contactor is used.\u003c\/p\u003e\u003ch2\u003eFrequently Asked Questions\u003c\/h2\u003e\u003cp\u003e\u003cstrong\u003eCan this switch be used for water systems?\u003c\/strong\u003e\u003cbr\u003eYes, the switch is suitable for water or air applications as it is part of a NEMA pressure switch range designed for both media.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat connection type does it use?\u003c\/strong\u003e\u003cbr\u003eIt uses a 1\/4 in NPT external fluid connection and screw clamp terminals for electrical wiring.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eIs the differential adjustable?\u003c\/strong\u003e\u003cbr\u003eThe unit has an approximate fixed differential of 40 psi; the rising pressure set range is 100 psi to 200 psi but the differential itself is not freely adjustable.\u003c\/p\u003e","brand":"Telemecanique Sensors","offers":[{"title":"Default Title","offer_id":46754073444571,"sku":"B00CONIYKO","price":30.86,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0724\/1043\/1707\/files\/71h8dIOoXLL._SL1500_b9299886-b890-415c-a6fa-65f8d1ed93f6.jpg?v=1747659097","url":"https:\/\/gearmusthave.com\/products\/telemecanique-sensors-air-compressor-pressure-switch-175-psi-set-off","provider":"GearMustHave","version":"1.0","type":"link"}