{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"D4A2509N","brand":"Omron","brandSlug":"omron","productSlug":"D4A2509N","canonicalUrl":"https://aoctrl.com/omron/D4A2509N","factsUrl":"https://aoctrl.com/api/mcp/products/D4A2509N","rawCanonicalId":null},"summary":{"shortDescription":"Omron D4A series, D4A2509N plunger limit switch, momentary action, IP67, DPDT simultaneous operation, 3 A @ 250 V AC, 0.4 A @ 125 V DC inductive, UL/CSA/CCC listed.","salesMarkdown":"The Omron D4A2509N is a metallic-body plunger limit switch from the D4A series, built for industrial position sensing in washdown or dusty environments. Momentary action means the contacts return to their normal state as soon as the plunger is released — no latching, no memory. The DPDT contact arrangement switches two independent circuits simultaneously, which is useful for dual-channel safety or separate signal and load paths. Rated 3 A at 250 V AC for general-purpose switching, and 0.4 A at 125 V DC for inductive loads — the DC inductive rating is the one to watch if you are switching solenoids or small DC relays, because the arc suppression is derated compared to resistive loads. At 30 V DC the inductive rating rises to 3 A, and at 14 V DC it handles 5 A inductive, so the part is usable across a range of low-voltage DC circuits as long as you respect the voltage-dependent curve. The IP67 rating means the switch body and the boot-sealed plunger withstand immersion in 1 meter of water for 30 minutes — suitable for food processing lines, outdoor conveyor systems, or any area that sees hose-down cleaning. The NEMA enclosure ratings (1, 2, 3, 4X, 5, 6P, 12, 13) confirm it meets US enclosure standards for indoor/outdoor, dust-tight, and corrosion-resistant service. ## Mechanical Fit and Installation Surface-mount body with two 0.2-inch mounting holes spaced 59 mm vertically and 29 mm horizontally. The aluminum housing is shock-resistant, and the stainless steel roller on the plunger adds wear life in high-cycle applications. Screw terminals simplify field wiring — no special connector needed. Pretravel is 0.06 inches, differential travel 0.02 inches, total travel 0.26 inches, giving a crisp snap-action feel with minimal overtravel margin.","metaTitle":"Omron D4A2509N Plunger Limit Switch, IP67, DPDT, 3 A @ 250 V","metaDescription":"Omron D4A2509N plunger limit switch, momentary action, IP67, DPDT contacts. Rated 3 A @ 250 V AC, 0.4 A @ 125 V DC inductive. UL, CSA, CCC listed. Mature lifecycle, sourced to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Limit Switches"],"specifications":{"Brand":"OMRON","Action":"Momentary","Series":"D4A","IP Rating":"IP67","Pretravel":"0.06 in","Standards":"CCC; CSA; UL Listed","Body Depth":"1.73 in","Body Width":"1.65 in","Body Height":"2.97 in","Contact Form":"DPDT - Simultaneous Operation","Total Travel":"0.26 in","Body Material":"Aluminum","Actuator Style":"Plunger","Mounting Style":"Surface","Roller Material":"Stainless Steel","lifecycle_stage":"mature","AC Contact Rating":"3 A @ 250 V","Actuator Location":"Top","DC Contact Rating":"0.4 A @ 125 V (Inductive Load); 0.4 A @ 125 V (Resistive Load); 3 A @ 30 V (Inductive Load); 3 A @ 30 V (Resistive Load); 5 A @ 14 V (Inductive Load); 5 A @ 14 V (Resistive Load)","Includes Actuator":"Actuator Included","Body Configuration":"Plug-In","Body Material Type":"Metallic","Differential Travel":"0.02 in","Boot Sealed Actuator":"Boot Included","Directional Movement":"Linear","Electrical Connection":"Screw Terminals","NEMA Enclosure Rating":"1; 12; 13; 2; 3; 4X; 5; 6P","Plunger Adjustability":"Fixed","Resistance Properties":"Shock Resistant","Mounting Hole Diameter":"0.2 in","Number of Mounting Holes":"2","Operating Temperature - Maximum":"212 °F","Operating Temperature - Minimum":"-40 °F","Mounting Hole Vertical Center to Center Distance":"59 mm","Mounting Hole Horizontal Center to Center Distance":"29 mm"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$115.57 – $253.29","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":null,"alternativesUrl":"https://aoctrl.com/api/mcp/products/D4A2509N/alternatives.json"},"ai":{"faq":[{"question":"What compliance documentation does Omron provide for the D4A2509N?","answer":"The switch is UL Listed, CSA certified, and CCC certified. These certifications cover North American and Chinese regulatory requirements. RoHS and REACH declarations are standard for Omron industrial switches but are not explicitly listed in this entry; request the declaration of conformity from your distributor."},{"question":"What are the key electrical ratings for the D4A2509N?","answer":"AC rating: 3 A at 250 V. DC rating varies by voltage: 0.4 A at 125 V (inductive or resistive), 3 A at 30 V (inductive or resistive), and 5 A at 14 V (inductive or resistive). The DPDT contacts are simultaneous operation, switching both poles at once."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/omron/D4A2509N","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/D4A2509N 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}}