{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3RB2906-2BG1","brand":"Siemens","brandSlug":"siemens","productSlug":"3RB2906-2BG1","canonicalUrl":"https://aoctrl.com/siemens/3RB2906-2BG1","factsUrl":"https://aoctrl.com/api/mcp/products/3RB2906-2BG1","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SIRIUS current measuring module, 3RB2906-2BG1, 0.3…3 A adjustable, 690 V AC-3e, stand-alone installation, straight-through transformers.","salesMarkdown":"The Siemens 3RB2906-2BG1 is a SIRIUS current measuring module, designed as a stand-alone unit that uses straight-through transformers for the main circuit. The adjustable current response range of 0.3 to 3 A covers small motor and transformer protection — set the dial to match the full-load current of the load, and the matching 3RB relay will trip within its Class 10 curve. Rated for AC-3e duty up to 690 V, with a 3 A operational current at 400 V, so it handles the control-circuit side of the motor branch, not the main power path. ## Lifecycle reality — NRND This module carries an NRND (Not Recommended for New Design) status. That means Siemens will continue to manufacture it for existing BOMs and service requirements, but new projects should select the current-generation alternative. For an existing line or a repair, the part is still available through the supply channel — quote to order. Stand-alone installation — no DIN-rail clip required. The module mounts directly to the panel or enclosure backplate via its own fixing points, with the straight-through transformer aperture accepting the main conductor. Keep the wiring paths short to the associated 3RB relay to avoid picking up coupled noise.","metaTitle":"Siemens 3RB2906-2BG1 SIRIUS Current Measuring Module, 0.3…3","metaDescription":"Siemens SIRIUS 3RB2906-2BG1 current measuring module, 0.3…3 A adjustable, 690 V AC-3e. NRND lifecycle. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"NRND","categoryPath":["Overload Relays"],"specifications":{"title":"3RB2906-2BG1","description":"Current transformer 0.3...3 A for 3RB22/23/24 Size S00/S0 Stand-alone installation Main circuit: straight-through transformer Auxiliary circuit: --","lifecycle_stage":"current","Fastening Method":"stand-alone installation","Product Brand Name":"SIRIUS","Product Designation":"Current measuring module","For Main Current Circuit":"straight-through transformers","at AC-3e rated value maximum":"690 V","Substance Prohibitance (Date)":"05/28/2009","Operational Current Rated Value":"3 A","operational current at AC-3e at 400 V rated value":"3 A","Adjustable Current Response Value Current Of The Current-Dependent Overload Release":"0.3 ... 3 A"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4e6a521391edd418836817fe8666f114.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=318262&mlfb=3RB2906-2BG1"},"ai":{"faq":[{"question":"What is 3RB2906-2BG1 used for?","answer":"It is a current measuring module that works with Siemens SIRIUS 3RB22, 3RB23, and 3RB24 overload relays in sizes S00 and S0. It senses motor current via a straight-through transformer and signals the relay to trip on overload."},{"question":"What is the adjustable current range of the 3RB2906-2BG1?","answer":"0.3 to 3 A, set by the dial on the module, matching it to the full-load current of the protected motor or transformer."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3RB2906-2BG1","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/3RB2906-2BG1 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-20T14:41:02.429Z","lastPublished":"2026-07-20T14:41:02.429Z","indexable":true}}