{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"D4SL-N4HFA-DN","brand":"Omron","brandSlug":"omron","productSlug":"D4SL-N4HFA-DN","canonicalUrl":"https://aoctrl.com/omron/D4SL-N4HFA-DN","factsUrl":"https://aoctrl.com/api/mcp/products/D4SL-N4HFA-DN","rawCanonicalId":null},"summary":{"shortDescription":"Omron D4SL-N4HFA-DN guard lock safety-door switch, 3NC + 2NC built-in switch, 24 VDC solenoid release, M20 conduit, resin head, connector type.","salesMarkdown":"The D4SL-N4HFA-DN is a guard lock safety-door switch from Omron, designed to interlock and lock access doors on machinery with a solenoid-release mechanism. The built-in switch configuration is 3NC + 2NC, giving two separate safety channels plus a third NC contact for status feedback or secondary monitoring. The solenoid release is 24 VDC (orange LED indicator confirms power present), and the door lock is mechanical — meaning the lock holds even if power is lost, and the solenoid releases to allow door opening only when energized. This is a standard fail-safe approach for guarding zones where unintended door opening during motion is a hazard. The head is resin, the conduit outlet is M20, and the connection method is via connector (not a cable gland). The release key is standard metal. This switch fits applications like machine tool guarding, packaging lines, and robotic cell access points where a positive-locked door is required per ISO 14119. ## Wiring and Installation M20 conduit entry suits standard metric gland plates. The connector style means the switch body can be replaced without rewiring the panel — unplug the old, plug in the new. The 3NC + 2NC arrangement: wire the two NC safety channels in series with the safety relay or controller inputs; the third NC can serve as a diagnostic feedback to a PLC. The 24 VDC solenoid draws power from a standard control transformer or PELV supply. The orange LED on the indicator confirms the solenoid is energized and the door is unlocked — a quick visual check during commissioning or fault-finding.","metaTitle":"Omron D4SL-N4HFA-DN Guard Lock Safety-door Switch, 3NC+2NC,","metaDescription":"Omron D4SL-N4HFA-DN guard lock safety-door switch with 3NC+2NC contacts, 24 VDC solenoid release, M20 conduit, resin head, connector type. Mature lifecycle, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Limit Switches"],"specifications":{"title":"D4SL-N4HFA-DN","Indicator":"D = 24VDC (orange LED indicator)","Product No.":"D4SL-N4HFA-DN","description":"Guard Lock Safety-door Switch","Product Type":"Guard Lock Safety-door Switch","Head Material":"F = Resin","Conduit Outlet":"4 = M20","Built-in Switch":"H = 3NC + 2NC","Shipping Weight":"1.5 Kg","lifecycle_stage":"mature","Release Key Type":"− = Standard release key (metal)","Connection Method":"N = Connector","Estimated Lead Time":"Usually ships in 1-10 working days.","Door Lock and Release":"A = Mechanical lock/24VDC solenoid release"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$207.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ee6db9fcbe980d3933c97068e27e7866.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the built-in switch configuration?","answer":"The built-in switch is 3NC + 2NC, providing three normally-closed contacts for safety circuits and two normally-closed contacts for auxiliary or status use."},{"question":"What is the door lock and release mechanism?","answer":"It uses a mechanical lock with a 24 VDC solenoid release. The lock holds the door closed without power; energizing the solenoid releases the door."},{"question":"What conduit size does this switch accept?","answer":"The conduit outlet is M20, a standard metric size for cable glands or conduit fittings."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/D4SL-N4HFA-DN","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/D4SL-N4HFA-DN when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}