{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"D4SL-N2HDA-D4","brand":"Omron","brandSlug":"omron","productSlug":"D4SL-N2HDA-D4","canonicalUrl":"https://aoctrl.com/omron/D4SL-N2HDA-D4","factsUrl":"https://aoctrl.com/api/mcp/products/D4SL-N2HDA-D4","rawCanonicalId":null},"summary":{"shortDescription":"Omron D4SL-N2HDA-D4 Guard Lock Safety-door Switch, mechanical lock / 24VDC solenoid release, metal head, G1/2 conduit, 3NC+2NC contacts, terminal block connection.","salesMarkdown":"The D4SL-N2HDA-D4 is a Guard Lock Safety-door Switch from Omron's D4SL series — a solenoid-locking safety interlock designed to prevent access to a guarded area until the machine control has removed power or motion. The mechanical lock holds the door closed; the 24VDC solenoid releases it only when the safety circuit permits. This is the variant with a metal head (D), a G1/2 conduit outlet (2), and a built-in switch configuration of 3NC + 2NC contacts (H). The 24VDC solenoid release is monitored by an orange LED indicator on the switch body, giving a quick visual check that the solenoid is powered and the lock is released. The special release key (resin) allows manual override in a fault condition — useful for freeing trapped personnel without power. Connection is via a terminal block inside the switch body, with a G1/2 conduit entry for the cable gland. The metal head gives better impact resistance than resin-head variants, so this is the one to specify for heavy industrial doors or where the switch might take a knock. ## Switch contact configuration — what 3NC + 2NC means for your safety circuit The built-in switch has five contact blocks: three normally-closed (NC) and two normally-closed (NC). That is a lot of NC contacts for a guard switch. In a typical safety circuit, the NC contacts are wired in series to the safety relay or PLC safety input — all must be closed (door locked) for the machine to run. The 3NC + 2NC arrangement gives you five independent channels to monitor the door lock position. This is more than the usual 2NC or 3NC found on basic interlocks; it allows for dual-channel monitoring plus a feedback loop, or for wiring through multiple safety zones without adding extra contact blocks. Compared to a standard 2NC + 1NC guard switch, the D4SL-N2HDA-D4's extra NC contacts give you redundancy and diagnostic coverage without needing an external expansion module. If you are designing to SIL 3 or PL e, the additional contacts simplify the architecture — you can dedicate one NC pair to the safety relay and another to the PLC for status monitoring, all within the same switch.","metaTitle":"Omron D4SL-N2HDA-D4 Guard Lock Safety-door Switch, 24VDC","metaDescription":"Guard Lock Safety-door Switch with mechanical lock and 24VDC solenoid release. Metal head, G1/2 conduit, 3NC+2NC contacts. Mature lifecycle, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Limit Switches"],"specifications":{"title":"D4SL-N2HDA-D4","Weight":"0.29 kg","Indicator":"D = 24VDC (orange LED indicator)","Product No":"D4SL-N2HDA-D4","description":"Guard Lock Safety-door Switch","Product Type":"Guard Lock Safety-door Switch","Head Material":"D = Metal","Conduit Outlet":"2 = G1/2","Built-in Switch":"H = 3NC + 2NC","Shipping Weight":"1.5 kg","lifecycle_stage":"mature","Release Key Type":"4 = Special release key (resin)","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 switch contact configuration?","answer":"The built-in switch has 3NC + 2NC contacts — five normally-closed channels for monitoring the door lock position."},{"question":"What voltage does the solenoid release require?","answer":"24VDC. The orange LED indicator lights when the solenoid is powered."},{"question":"What conduit size does this switch use?","answer":"G1/2 conduit outlet — standard for European cable glands."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/omron/D4SL-N2HDA-D4","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-N2HDA-D4 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}}