{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"D4SL-N4HDA-D","brand":"Omron","brandSlug":"omron","productSlug":"D4SL-N4HDA-D","canonicalUrl":"https://aoctrl.com/omron/D4SL-N4HDA-D","factsUrl":"https://aoctrl.com/api/mcp/products/D4SL-N4HDA-D","rawCanonicalId":null},"summary":{"shortDescription":"Omron D4SL-N4HDA-D, Guard Lock Safety-door Switch, mechanical lock with 24VDC solenoid release, 3NC+2NC contacts, metal head, M20 conduit, terminal block connection.","salesMarkdown":"The Omron D4SL-N4HDA-D is a guard lock safety-door switch — a mechanical lock that holds a guard closed until the solenoid releases it. It's the part that keeps a machine from cycling open or an operator from opening a door mid-cycle. The built-in switch configuration is 3NC + 2NC, meaning five contacts total, all normally-closed for fail-safe monitoring of the guard position and lock status. The solenoid releases on 24 VDC, and an orange LED indicator confirms power is present at the coil. The metal head and M20 conduit outlet suit industrial environments where the switch sees physical impact and needs a standard metric gland entry. Connection is via terminal block inside the housing. No official successor has been designated for the D4SL-N4HDA-D. If you are holding this on a BOM for an existing machine, the current part is the right one to order. There is no pin-compatible replacement to evaluate — the mature status means Omron intends to keep supplying this exact configuration. ## What the contact count means for your safety circuit Five normally-closed contacts (3NC + 2NC) give you flexibility in wiring the safety chain. Typically, one set monitors the guard position, another confirms the lock bolt is engaged, and the remaining contacts can feed back to a safety PLC or relay for diagnostics. All NC means the circuit fails safe — if a wire breaks or the switch loses power, the contacts open and the machine stops. The mechanical lock / 24 VDC solenoid release (code A) means the door stays locked when power is removed. You apply voltage to release the lock. That is the standard fail-safe arrangement for access guarding — the guard cannot be opened in a power-loss situation unless you manually override the release key.","metaTitle":"Omron D4SL-N4HDA-D Guard Lock Safety-door Switch, 3NC+2NC, 2","metaDescription":"Omron D4SL-N4HDA-D guard lock safety-door switch. Mechanical lock with 24VDC solenoid release. 3NC+2NC contacts, metal head, M20 conduit. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Limit Switches"],"specifications":{"title":"D4SL-N4HDA-D","Weight":"0.37 kg","Indicator":"D = 24VDC (orange LED indicator)","Product No":"D4SL-N4HDA-D","description":"Guard Lock Safety-door Switch","Product Type":"Guard Lock Safety-door Switch","Head Material":"D = Metal","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":"Terminal block","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":"$192.00","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/ce5102ba95378628af291525ee900d00.pdf","sourceUrl":null},"ai":{"faq":[{"question":"What is the closest alternative to the D4SL-N4HDA-D in this family?","answer":"No official successor or direct alternative is listed for this order code. The mature lifecycle status indicates the manufacturer intends to continue supplying this exact configuration. If you need a different contact arrangement or conduit size, look at other D4SL variants with the same mechanical lock / 24 VDC solenoid release (code A) but different switch counts or outlet options."},{"question":"What does the indicator tell me on this switch?","answer":"The orange LED indicator lights when 24 VDC is applied to the solenoid coil. It confirms the release circuit is powered, so you can see at a glance whether the lock is energized for release."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/D4SL-N4HDA-D","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-N4HDA-D 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}}