{"product_id":"omron-sr125sms4503-stop-motion-safety-relay-reliable-delivery","title":"Omron SR125SMS4503 Stop Motion Sensing Unit for Industrial Motor Safety Monitoring","description":"\u003ch4\u003eDescription \u003c\/h4\u003e\n\u003cdiv class=\"text-base my-auto mx-auto pb-10 [--thread-content-margin:--spacing(4)] @[37rem]:[--thread-content-margin:--spacing(6)] @[72rem]:[--thread-content-margin:--spacing(16)] px-(--thread-content-margin)\"\u003e\n\u003cdiv class=\"[--thread-content-max-width:32rem] @[34rem]:[--thread-content-max-width:40rem] @[64rem]:[--thread-content-max-width:48rem] mx-auto flex max-w-(--thread-content-max-width) flex-1 text-base gap-4 md:gap-5 lg:gap-6 group\/turn-messages focus-visible:outline-hidden\" tabindex=\"-1\"\u003e\n\u003cdiv class=\"group\/conversation-turn relative flex w-full min-w-0 flex-col agent-turn\"\u003e\n\u003cdiv class=\"relative flex-col gap-1 md:gap-3\"\u003e\n\u003cdiv class=\"flex max-w-full flex-col grow\"\u003e\n\u003cdiv data-message-model-slug=\"gpt-4o\" class=\"min-h-8 text-message relative flex w-full flex-col items-end gap-2 text-start break-words whitespace-normal [.text-message+\u0026amp;]:mt-5\" dir=\"auto\" data-message-id=\"1ad8feb0-4f79-4d42-bf01-5335c1d5de6e\" data-message-author-role=\"assistant\"\u003e\n\u003cdiv class=\"flex w-full flex-col gap-1 empty:hidden first:pt-[3px]\"\u003e\n\u003cdiv class=\"markdown prose dark:prose-invert w-full break-words light\"\u003e\n\u003cp data-end=\"75\" data-start=\"0\"\u003eThe Omron SR125SMS4503 is a stop motion sensing unit designed to monitor motor deceleration by detecting residual back electromotive force (back-EMF). It confirms when rotating machinery has reached a safe stop before enabling guard unlocking or machine access. The Omron SR125SMS4503 is widely used in industrial safety systems to improve personnel protection and machine control.\u003c\/p\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003c\/div\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003cp data-start=\"284\" data-end=\"574\" class=\"\"\u003e \u003c\/p\u003e\n\u003ch4\u003eTechnical Specifications \u003c\/h4\u003e\n\u003ctable width=\"100%\" style=\"height: 323.501px; width: 100%;\"\u003e\n\u003ctbody\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eCondition\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eNew\/Never Used Surplus\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eBrand\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eOmron\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eCategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eSafety Equipment\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003ePart Number\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eSR125SMS4503\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eSubcategory\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eStop Motion Sensing Unit\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eDevice Type\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eSafety Monitoring Relay\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eSupply Voltage\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003e24 VDC\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003ePower Consumption\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003e≤ 3.0 W\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetection Method\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eBack-EMF sensing\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eDetection Threshold\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eAdjustable from 0.01 V to 0.10 V\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eSafety Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003e1 N\/O and 1 N\/C relay contacts\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eAuxiliary Outputs\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003e2 solid-state signaling outputs\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eMounting\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003e35 mm DIN Rail\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eProtection Rating\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eIP40 housing, IP20 terminals\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eOperating Temperature\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003e-10°C to +55°C (14°F to 131°F)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 19.5938px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 19.5938px;\"\u003e\u003cstrong\u003eApprovals\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 19.5938px;\"\u003eUL, CSA, TÜV, CE, EN ISO 13849-1, EN62061\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003ctr style=\"height: 10px;\"\u003e\n\u003ctd style=\"width: 36.5497%; height: 10px;\"\u003e\u003cstrong\u003eWeight\u003c\/strong\u003e\u003c\/td\u003e\n\u003ctd style=\"width: 63.231%; height: 10px;\"\u003e0.45 kg (0.99 lb)\u003c\/td\u003e\n\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\n\u003cp\u003e \u003cspan style=\"font-size: 0.875rem;\"\u003e \u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch4\u003eInformation About SR125SMS4503\u003c\/h4\u003e\n\u003cp\u003eThe Omron SR125SMS4503 is a compact stop motion sensing unit designed to detect when motors have completely stopped by monitoring residual voltage (back-EMF). As part of Omron’s safety relay lineup, this unit provides secure monitoring of motor deceleration for safe interlocking of guards and brakes. Featuring adjustable sensitivity and solid-state auxiliary outputs, the SR125SMS4503 ensures precise and reliable zero-speed detection. Although now discontinued, it remains widely used in legacy motor control safety applications.\u003c\/p\u003e\n\u003ch4\u003eKey Features:\u003c\/h4\u003e\n\u003cul\u003e\n\u003cli\u003eBack-EMF Detection: Monitors motor winding voltage to confirm stop condition before releasing safety interlocks.\u003c\/li\u003e\n\u003cli\u003eRelay and Solid-State Outputs: Provides one N\/O and one N\/C relay output plus two auxiliary semiconductor outputs for signaling zero-speed status.\u003c\/li\u003e\n\u003cli\u003eAdjustable Threshold: Detection voltage threshold adjustable from 0.01 V to 0.10 V for tuning to various motor types.\u003c\/li\u003e\n\u003cli\u003eDIN-Rail Mountable: Compact design for easy integration into industrial control cabinets.\u003c\/li\u003e\n\u003cli\u003e24 VDC Supply Voltage: Low power consumption (150 mA) simplifies integration into safety circuits.\u003c\/li\u003e\n\u003cli\u003eIP40 Housing \/ IP20 Terminals: Designed for installation within protected electrical enclosures.\u003c\/li\u003e\n\u003cli\u003eHigh Reliability and Safety Compliance: Certified to EN ISO 13849-1, UL, and TÜV standards for safety relay applications.\u003c\/li\u003e\n\u003cli\u003eDiagnostic LEDs: Visual indication of operating status and error conditions.\u003c\/li\u003e\n\u003cli\u003eDiscontinued Model: Available through surplus and aftermarket channels for supporting legacy equipment.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe Omron SR125SMS4503 provides dependable, zero-speed detection for machine safety systems, helping prevent access to hazardous areas until motor motion ceases. Its reliable back-EMF monitoring, flexible outputs, and safety certifications make it a trusted solution for ensuring operator protection in legacy motor-driven applications.\u003c\/p\u003e","brand":"Omron","offers":[{"title":"Default Title","offer_id":50420382892330,"sku":"SR125SMS4503","price":899.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0800\/0392\/4266\/files\/s-l1600_8e4331dc-151f-4d5d-8534-d2ff2ff1ba6a.webp?v=1753131260","url":"https:\/\/iqelectro.com\/products\/omron-sr125sms4503-stop-motion-safety-relay-reliable-delivery","provider":"IQElectro","version":"1.0","type":"link"}