{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"D4ER1A21N","brand":"Omron","brandSlug":"omron","productSlug":"D4ER1A21N","canonicalUrl":"https://aoctrl.com/omron/D4ER1A21N","factsUrl":"https://aoctrl.com/api/mcp/products/D4ER1A21N","rawCanonicalId":null},"summary":{"shortDescription":"Omron D4E-N series, D4ER1A21N, limit switch with roller plunger actuator, 1NO+1NC contacts, screw terminals, IP67, 250 VAC insulation voltage, 1 A / 30 VDC switching.","salesMarkdown":"The Omron D4ER1A21N is a limit switch from the D4E-N series, fitted with a roller plunger actuator that requires 11.8 N to operate. The contact block gives you one normally-open and one normally-closed set (1NO+1NC), terminated via screw terminals. Rated insulation voltage is 250 VAC; for DC loads it switches up to 1 A at 30 VDC. ## Where it goes and why it matters IP67 rating means the switch body and the roller plunger seal against washdown and dust ingress — it lives on a machine frame or conveyor line where coolant, washdown, or outdoor exposure is routine. The screw terminals simplify field wiring; no special tooling needed. Roller plunger suits cam-actuated or slide-actuated positions where the actuator follows the motion rather than taking a direct head-on hit.","metaTitle":"Omron D4ER1A21N Limit Switch, Roller Plunger, 1NO/1NC, IP67","metaDescription":"Omron D4E-N series limit switch D4ER1A21N with roller plunger actuator, 11.8 N operating force, 1NO+1NC contacts, screw terminals, IP67. Mature lifecycle – sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Limit Switches"],"specifications":{"Series":"D4E-N","Actuator Type":"Roller Plunger","Operating Force":"11.8 N","lifecycle_stage":"mature","Termination Type":"Screw Terminal","Protection Rating":"IP67","Insulation Voltage":"250 VAC","Contact Configuration":"1NO;1NC","Switching Current - DC":"1 A","Switching Voltage - DC":"30 V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$31.50","priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/f7cb830bc2bbbdcd378fc969e4d872f0.pdf","sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/D4ER1A21N/alternatives.json"},"ai":{"faq":[{"question":"What is the D4ER1A21N's actuator type and operating force?","answer":"It uses a roller plunger actuator with an operating force of 11.8 N. The roller follows cam or slide motion, reducing wear compared to a straight plunger on angled surfaces."},{"question":"Where can I buy D4ER1A21N and how is it quoted?","answer":"The D4ER1A21N is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — lead time and stock levels are confirmed at quote time."},{"question":"What is the closest alternative to D4ER1A21N in the D4E-N family?","answer":"Within the D4E-N series, the closest functional peer would share the same roller plunger actuator and 1NO+1NC contact arrangement. The deciding difference is usually the operating force or the termination style — verify the specific order code against your application's force and wiring requirements."},{"question":"What compliance documentation does Omron provide for D4ER1A21N?","answer":"Omron typically provides a declaration of conformity covering the applicable EU directives (CE marking) and a RoHS compliance certificate for the D4E-N series. For specific documentation (UL, REACH, IEC) tied to this order code, request the compliance pack at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/omron/D4ER1A21N","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/omron/D4ER1A21N when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-09-02T08:15:54.622Z","lastPublished":"2026-09-02T08:15:54.622Z","indexable":true}}