{"product_id":"21ch38-18-honeywell-limit-switch-spdt-4a-28vdc","title":"21CH38-18 Honeywell Limit Switch SPDT 4A 28VDC","description":"\u003ch2\u003e\u003cstrong\u003e21CH38-18 – Honeywell Limit Switch: Rugged, Reliable, and Ready for Industrial Use\u003c\/strong\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand \u0026amp; Model:\u003c\/strong\u003e Honeywell \u003cstrong\u003e21CH38-18\u003c\/strong\u003e – a robust enclosed limit switch.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eContact Form:\u003c\/strong\u003e SPDT (single pole double throw) for flexible circuit control.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eActuator Style:\u003c\/strong\u003e Roller actuator reduces friction and wear over time.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eElectrical Ratings:\u003c\/strong\u003e \u003cspan style=\"color: #e03e2e;\"\u003e4A at 28VDC\u003c\/span\u003e ensures reliable switching in DC circuits.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOperating Force:\u003c\/strong\u003e Requires \u003cspan style=\"color: #e03e2e;\"\u003e6 lb to 12 lb\u003c\/span\u003e for positive actuation feedback.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTermination Style:\u003c\/strong\u003e Wire leads simplify panel mounting and wiring.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Panel mount design secures the switch in place.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eWeight:\u003c\/strong\u003e \u003cspan style=\"color: #e03e2e;\"\u003e0.737 Kg\u003c\/span\u003e reflects its rugged, all-metal enclosure.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eIllumination:\u003c\/strong\u003e Non-illuminated – ideal for applications without indicator needs.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eTechnical Specifications – Honeywell 21CH38-18\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Honeywell – a trusted name in industrial controls.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e \u003cstrong\u003e21CH38-18\u003c\/strong\u003e – order with confidence using this exact code.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eVoltage Rating DC:\u003c\/strong\u003e 28 VDC – perfect for low-voltage DC systems.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCurrent Rating:\u003c\/strong\u003e 4 A – supports moderate power loads safely.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eEnvironmental Tolerance:\u003c\/strong\u003e Enclosed housing resists dust, oil, and debris.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterference Rejection:\u003c\/strong\u003e Mechanical design ignores electrical noise common in factories.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eInstallation Guide for 21CH38-18 Limit Switch\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eMount the switch on a flat panel using two M4 screws (not included).\u003c\/li\u003e\n\u003cli\u003eConnect the common (COM), normally open (NO), and normally closed (NC) wires correctly.\u003c\/li\u003e\n\u003cli\u003eAdjust the roller actuator to align with your machine’s cam or moving part.\u003c\/li\u003e\n\u003cli\u003eApply 6-12 lb force to test the switching point before final tightening.\u003c\/li\u003e\n\u003cli\u003eKeep wire leads away from sharp edges and high-temperature surfaces.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003ePackage List – Honeywell Enclosed Switch 21CH38-18\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e1 x Honeywell \u003cstrong\u003e21CH38-18\u003c\/strong\u003e limit switch with roller actuator.\u003c\/li\u003e\n\u003cli\u003ePre-attached wire leads for immediate connection.\u003c\/li\u003e\n\u003cli\u003eInstallation instruction sheet (basic diagram only).\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eShipping \u0026amp; Delivery Options\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eWe ship via \u003cstrong\u003eFedEx, UPS, and DHL\u003c\/strong\u003e for global fast delivery.\u003c\/li\u003e\n\u003cli\u003eTracking number provided within 24 hours after dispatch.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cstrong\u003eFAQ – Honeywell 21CH38-18 Limit Switch\u003c\/strong\u003e\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Can I use this switch with AC voltage?\u003c\/strong\u003e A: This \u003cstrong\u003e21CH38-18\u003c\/strong\u003e works best with DC 28V; not rated for AC.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Is the roller actuator replaceable?\u003c\/strong\u003e A: The roller is factory-sealed; replace the whole switch for safety.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: What is the operating temperature range?\u003c\/strong\u003e A: Honeywell rates this model for -20°C to +70°C.\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eQ: Does it include mounting screws?\u003c\/strong\u003e A: No, you will need two M4 screws separately.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e\u003cstrong\u003eAuthor: Ubest Automation – your reliable partner for industrial controls.\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003e© 2026 Ubest Automation Limited. \u003ca href=\"https:\/\/www.ubestplc.com\/\"\u003ehttps:\/\/www.ubestplc.com\/\u003c\/a\u003e All rights reserved.\u003c\/strong\u003e\u003cbr\u003e\u003cstrong\u003eContact: \u003ca href=\"mailto:sales@ubestplc.com\"\u003esales@ubestplc.com\u003c\/a\u003e | Phone: \u003ca href=\"https:\/\/wa.me\/8618030005825\"\u003e+86 180 3000 5825\u003c\/a\u003e (Click to chat on WhatsApp)\u003c\/strong\u003e\u003c\/p\u003e","brand":"Honeywell","offers":[{"title":"Default Title","offer_id":52073786245402,"sku":"21CH38-18","price":253.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0873\/6240\/4634\/files\/21CH38-18-1.jpg?v=1776049206","url":"https:\/\/www.ubestplc.com\/products\/21ch38-18-honeywell-limit-switch-spdt-4a-28vdc","provider":"Ubest Automation Limited","version":"1.0","type":"link"}