{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VM9908-0BB11","brand":"Siemens","brandSlug":"siemens","productSlug":"3VM9908-0BB11","canonicalUrl":"https://aoctrl.com/siemens/3VM9908-0BB11","factsUrl":"https://aoctrl.com/api/mcp/products/3VM9908-0BB11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON undervoltage release, 24V DC, auxiliary release for 3VM circuit breakers up to 630A, 4 kV surge voltage resistance, overvoltage category III, pollution degree 3.","salesMarkdown":"The Siemens 3VM9908-0BB11 is a SENTRON undervoltage release rated for 24V DC, designed as an auxiliary release accessory for 3VM circuit breakers up to 630A. It drops the breaker when control voltage falls below the dropout threshold — a standard requirement for emergency-stop circuits and undervoltage protection schemes in industrial panels. The 4 kV surge voltage resistance covers transient overvoltages from the mains side, so the release won't nuisance-trip or fail on a nearby lightning strike or switching surge. Power consumption is 2.5 W max at DC — a modest continuous draw that a 24V DC supply can handle without derating, but worth budgeting if you're stacking multiple releases on the same control transformer. Physical footprint: 28.8 mm deep × 25.7 mm wide × 65.1 mm high. That compact width lets it snap into the accessory slot on the 3VM breaker without expanding the DIN-rail footprint. The 10 mm stripped length matches standard ferrule preparation for the control wiring. ## Integration note Mounts directly into the accessory slot on 3VM breakers up to 630A frame. No additional DIN-rail space required — the release sits within the breaker envelope. Confirm polarity on the DC supply and verify free-wheel diode suppression if the release shares a control transformer with inductive loads.","metaTitle":"Siemens 3VM9908-0BB11 SENTRON Undervoltage Release, 24V DC,","metaDescription":"Siemens SENTRON 3VM9908-0BB11 undervoltage release, 24V DC, for 3VM breakers to 630A. Active production. 4 kV surge, pollution degree 3. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Molded Case Circuit Breakers (MCCB)"],"specifications":{"Depth":"28.8 mm","Width":"25.7 mm","Height":"65.1 mm","Maximum":"16","Minimum":"20","Accessories":"Auxiliary release","Number Of Slots":"3","Product version":"Auxiliary release","Stripped Length":"10 mm","lifecycle_stage":"current","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Accessories","Overvoltage category":"III","Stripped Length [In]":"0.4 in","Surge Voltage Resistance":"4 kV","consumed active power / at DC / maximum":"2.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e3a9467547a17ef94fa57eaffc6bb7e7.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=575121&mlfb=3VM9908-0BB11","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VM9908-0BB11/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 3VM9908-0BB11 and get current pricing?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead-time estimate."},{"question":"What is the 3VM9908-0BB11 used for?","answer":"It is an undervoltage release for Siemens SENTRON 3VM circuit breakers up to 630A. It trips the breaker when the 24V DC control voltage falls below the dropout threshold, providing undervoltage protection or enabling remote emergency-stop functionality."},{"question":"What compliance documentation does Siemens provide for this part?","answer":"As a SENTRON accessory, the 3VM9908-0BB11 is designed for overvoltage category III and pollution degree 3 environments. Standard Siemens documentation includes CE declaration of conformity; RoHS and REACH compliance data is available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VM9908-0BB11","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/3VM9908-0BB11 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}}