{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RK1901-2NR21","brand":"Siemens","brandSlug":"siemens","productSlug":"3RK1901-2NR21","canonicalUrl":"https://aoctrl.com/siemens/3RK1901-2NR21","factsUrl":"https://aoctrl.com/api/mcp/products/3RK1901-2NR21","rawCanonicalId":null},"summary":{"shortDescription":"Siemens AS-Interface M12 branch, 3RK1901-2NR21, flat cable transition to M12, 1m cable with angled M12 socket, IP67/68/69K, 4A max.","salesMarkdown":"The Siemens 3RK1901-2NR21 is an AS-Interface M12 branch that transitions the AS-i flat cable to an M12 connector — specifically a 1-meter cable with an angled M12 cable socket. It uses an insulation piercing method to tap into the flat cable, so no stripping or cutting the backbone is needed; the cable simply lays into the housing and the screw fixing clamps it down. The branch carries both the AS-i data/power pair and the auxiliary power (AUX) on the same M12 connector, with pin assignment: 1 = ASI+, 2 = AUX-, 3 = ASI-, 4 = AUX+. The contact rating is 4 A maximum, with a rated operational current of 3 A. Rated for the full AS-i voltage range of 26.5 to 31.6 V, it operates from -25 to +75 °C and stores from -25 to +85 °C. This is a field-mount accessory for AS-Interface networks — it creates a local M12 drop point for a sensor or actuator without cutting the flat cable. Mounting is by screw fixing; the tightening torque for the fixing screw is 1.65 N·m. The manufacturer note states that the cable must not end in the feeder — meaning the branch is designed for a pass-through topology, not a dead-end termination.","metaTitle":"Siemens 3RK1901-2NR21 AS-Interface M12 Branch, IP67/68/69K,","metaDescription":"Siemens 3RK1901-2NR21 AS-Interface M12 branch cable with insulation piercing for flat cable. IP67/68/69K, rated 4A, 26.5-31.6V. Active production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Remote I/O & Fieldbus Modules"],"specifications":{"Note":"cable must not end in the feeder","Function":"AS-i flat cable transition to M12","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","Contacts Load rating max":"4A","Inputs socket assignment":"1 = ASI + 2 = AUX - 3=ASI - 4 = AUX +","Type Of Electrical Connection":"insulation piercing method for AS-Interface flat cable","Operational Current Rated Value":"3A","Tightening Torque Of Fixing Screw":"1.65 ... 1.65N·m","Ambient Temperature During Storage":"-25 ... +85°C","operating voltage according to AS-Interface spezification":"26.5 ... 31.6V"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$38.10","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=1123820&mlfb=3RK1901-2NR21","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RK1901-2NR21/alternatives.json"},"ai":{"faq":[{"question":"What does the note 'cable must not end in the feeder' mean?","answer":"It means this branch is designed for a pass-through or tap configuration on the AS-i flat cable, not as a terminating end-of-line device. The cable should continue past the connection point."},{"question":"What is the function of this part?","answer":"It transitions the AS-Interface flat cable to an M12 connector, providing a local drop point for an M12-equipped sensor or actuator. It also carries auxiliary power (AUX) on the same connector."},{"question":"What is the IP rating and where can it be used?","answer":"IP67/68/69K — the housing and M12 connection withstand dust ingress, temporary submersion (1 m depth), and high-pressure hot-water washdown. Suitable for wet or washdown environments like food processing or outdoor conveyor lines."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RK1901-2NR21","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/3RK1901-2NR21 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}}