{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RV5901-1B","brand":"Siemens","brandSlug":"siemens","productSlug":"3RV5901-1B","canonicalUrl":"https://aoctrl.com/siemens/3RV5901-1B","factsUrl":"https://aoctrl.com/api/mcp/products/3RV5901-1B","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS lateral auxiliary switch, 3RV5901-1B, 2 NO contacts, 9.5 mm width, screw-type terminals, for circuit breaker sizes S00, S0, S2, S3.","salesMarkdown":"The Siemens SIRIUS 3RV5901-1B is a lateral auxiliary switch designed to snap onto the side of SIRIUS circuit breakers in sizes S00, S0, S2, and S3. It provides two normally open (NO) instantaneous contacts for status feedback or control logic, wired via screw-type terminals accepting 2x (0.5...1.5 mm²) or 2x (0.75...2.5 mm²) solid or ferruled stranded conductors. ## What the contact ratings mean for your circuit The contact ratings are voltage-dependent, not a single blanket ampacity. At 24 V the switch is rated 2 A; at 230 V it handles 4 A; at 400 V it's 3 A; and at 690 V it reaches the maximum 10 A. The AC-15 rating at 690 V is 1 A, which governs inductive loads like contactor coils. This means the 3RV5901-1B can carry higher currents at higher voltages in resistive or lightly inductive circuits, but for heavily inductive switching (AC-15) you derate significantly at 690 V. At 9.5 mm wide, this auxiliary switch adds minimal DIN-rail footprint when plugged into the side of the breaker. The plug-in fixing means no separate mounting hardware — it clips directly onto the breaker housing.","metaTitle":"Siemens 3RV5901-1B SIRIUS Auxiliary Switch, 2 NO, 9.5mm, 10A","metaDescription":"Siemens SIRIUS 3RV5901-1B lateral auxiliary switch for S00/S0/S2/S3 breakers. 2 NO contacts, 9.5mm wide, screw terminals, IP20. Current production. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Motor Protection Circuit Breakers (MPCB)"],"specifications":{"Depth":"70mm","Solid":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Width":"9.5mm","Height":"90mm","Maximum":"10A","at 24 V":"2A","at 110 V":"0.5A","at 220 V":"0.25A","at 230 V":"4A","at 250 V":"0.25A","at 400 V":"3A","at 690 V":"10A","During Storage":"-50 ... +80°C","lifecycle_stage":"current","During Operation":"-20 ... +60°C","Fastening Method":"plug-in fixing","Product Brand Name":"SIRIUS","Product Designation":"auxiliary switch, lateral","Design Of The Product":"lateral auxiliary switches","With Core End Processing":"2x (0.5 ... 1.5 mm²), 2x (0.75 ... 2.5 mm²)","Size Of The Circuit-Breaker":"S00, S0, S2, S3","at AC-15 at 690 V rated value":"1A","at AWG cables for auxiliary contacts":"2x (20 ... 14)","touch protection on the front acc. to IEC 60529":"finger-safe, for vertical contact from the front","protection class IP on the front acc. to IEC 60529":"IP20","Type Of Electrical Connection For Auxiliary And Control Circuit":"screw-type terminals","number of CO contacts of auxiliary contacts instantaneous contact":"0","number of NC contacts for auxiliary contacts instantaneous contact":"0","number of NO contacts for auxiliary contacts instantaneous contact":"2"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/87b30c508f291d0186792c8d0fe991ed.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=621614&mlfb=3RV5901-1B","alternativesUrl":"https://aoctrl.com/api/mcp/products/3RV5901-1B/alternatives.json"},"ai":{"faq":[{"question":"What is 3RV5901-1B used for?","answer":"It is a lateral auxiliary switch that mounts onto SIRIUS circuit breakers in sizes S00, S0, S2, and S3 to provide two NO auxiliary contacts for status feedback or control interlocking."},{"question":"What are the contact ratings for 3RV5901-1B?","answer":"The contacts are rated 2 A at 24 V, 4 A at 230 V, 3 A at 400 V, and 10 A at 690 V. The AC-15 inductive rating at 690 V is 1 A."},{"question":"Where can I buy 3RV5901-1B?","answer":"It is sourced and quoted to order against an RFQ through our independent distribution channel. Availability and current pricing are confirmed at quote time."},{"question":"Will 3RV5901-1B fit a panel specified for 3RH2131-1AH00?","answer":"No — the 3RH2131-1AH00 is a standalone auxiliary contactor (45 mm wide, DIN-rail or screw mount) with 3 NO + 1 NC contacts, while the 3RV5901-1B is a 9.5 mm lateral add-on that plugs directly into a SIRIUS breaker housing. They are not footprint-compatible; the 3RV5901-1B requires the host breaker to be present."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RV5901-1B","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/3RV5901-1B 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}}