{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1901-1NR20","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1901-1NR20","canonicalUrl":"https://aoctrl.com/siemens/3RK1901-1NR20","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1901-1NR20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens 3RK1901-1NR20 AS-Interface M12 branch, U_ASI and Uaux, 1x M12 socket, IP67/68/69K, 4 A max, insulation-piercing flat-cable transition.","salesMarkdown":"## What this M12 branch does The 3RK1901-1NR20 is an AS-Interface flat-cable transition to an M12 socket — it taps the AS-i bus (26.5–31.6 V) and the auxiliary power (Uaux) from the flat cable and brings them out to a single M12 female connector. Pinout is fixed: pin 1 = AS-i +, pin 2 = Uaux –, pin 3 = AS-i –, pin 4 = Uaux +. That means a standard M12 cordset gives you both the bus signal and a separate 24 V auxiliary supply in one connector — no need for a second drop. ## IP rating and mounting reality Rated IP67/68/69K — the housing and the M12 socket withstand high-pressure washdown and temporary submersion, so it fits food-and-bev, washdown, or outdoor conveyor lines where a standard IP67 module would fail under a hose-down cycle. Mounts with screw fixing, not DIN-rail snap-on. Plan for a drilled panel or bracket — the flat cable runs through the insulation-piercing gland, and the branch body bolts down. ## Current and temperature limits Contacts rated 4 A max — enough for a small actuator or sensor cluster on the auxiliary supply, but not for a motor or heater load. The branch is a signal-and-power tap, not a power distribution block. Ambient operating range –25 to +75 °C, storage –25 to +85 °C.","metaTitle":"Siemens 3RK1901-1NR20 AS-i M12 Branch, IP67/68/69K, 4A","metaDescription":"Siemens 3RK1901-1NR20 AS-Interface M12 branch with U_ASI and Uaux. IP67/68/69K, 4 A max, insulation-piercing flat-cable tap. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Note":"cable must not end in the feeder","title":"3RK1901-1NR20","Function":"AS-i flat cable transition to M12","Connection":"1x M12 socket","description":"AS-Interface M12 branch U_ASI and Uaux, with M12 socket IP67/68/69K, max. 4 A","Number sockets":"1","Type of device":"AS-Interface accessories","lifecycle_stage":"current","Type of mounting":"screw fixing","Ambient Temperature":"-25 ... +75°C","Degree Of Protection":"IP67/68/69K","Design Of The Product":"AS-i M12 feeder, AS-i with Uaux, M12 socket","Contacts Load rating max":"4A","Inputs socket assignment":"1 = AS-i \"+\" 2 = Uaux \"-\" 3=AS-i \"-\" 4 = Uaux \"+\"","Type Of Electrical Connection":"insulation piercing method for AS-Interface flat cable","Ambient Temperature During Storage":"-25 ... +85°C","operating voltage according to AS-Interface spezification":"26.5 ... 31.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$41.15","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2506c84bc50fd54eb200b0e325c9c833.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=411263&mlfb=3RK1901-1NR20"},"ai":{"faq":[{"question":"How can I order 3RK1901-1NR20 or check stock?","answer":"Sourced to order against the BOM quantity. No stock-holding claim is made here."},{"question":"What does the note 'cable must not end in the feeder' mean?","answer":"It means the AS-i flat cable should not terminate inside this branch module — the cable passes through the insulation-piercing connection and continues to the next drop. The branch is a tap, not a cable end."},{"question":"What is the function of 3RK1901-1NR20?","answer":"It transitions the AS-i flat cable to a single M12 socket, carrying both AS-i bus voltage and auxiliary power (Uaux) on the same connector. Pinout: pin 1 = AS-i +, pin 2 = Uaux –, pin 3 = AS-i –, pin 4 = Uaux +."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1901-1NR20","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/siemens/3RK1901-1NR20 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}}