{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VM9908-0BB27","brand":"Siemens","brandSlug":"siemens","productSlug":"3VM9908-0BB27","canonicalUrl":"https://aoctrl.com/siemens/3VM9908-0BB27","factsUrl":"https://aoctrl.com/api/mcp/products/3VM9908-0BB27","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON undervoltage release, 440-480V AC 50/60Hz, 4 kV surge, 2.5 VA, for 3VM breakers to 630A, 28.8 x 25.7 x 65.1 mm.","salesMarkdown":"The Siemens SENTRON 3VM9908-0BB27 is an undervoltage release accessory for 3VM moulded-case circuit breakers rated up to 630 A. Coil is rated 440-480 V AC at 50/60 Hz and draws 2.5 VA maximum. That draw is small enough that the control transformer sizing is rarely an issue, but verify the control circuit fuse is rated for the inrush — typical undervoltage releases pull a brief surge on dropout recovery. That means it's designed for fixed-installation panels where the supply is permanently connected and the environment can have conductive dust or condensation — standard for industrial switchboards, not clean-room gear. Dimensions are 28.8 mm deep, 25.7 mm wide, 65.1 mm high. It clips into the accessory slot on the 3VM breaker body — no DIN-rail space consumed, no extra wiring channel needed. The stripped length spec of 10 mm (0.4 in) tells your panel wireman the exact strip length for the coil terminals; no guessing, no whiskers. The three accessory slots on the 3VM frame mean you can stack this undervoltage release alongside a shunt trip or auxiliary switch without crowding. Plan the slot assignment before wiring — once the breaker is in the panel, swapping slot order means pulling the whole accessory stack.","metaTitle":"Siemens 3VM9908-0BB27 Undervoltage Release, 440-480V AC, SEN","metaDescription":"Siemens SENTRON 3VM9908-0BB27 undervoltage release for 3VM breakers to 630A. 440-480V AC 50/60Hz, 4 kV surge, IP20. Active production, sourced 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","Apparent Power Consumption / Maximum":"2.5 VA"}},"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=575134&mlfb=3VM9908-0BB27","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VM9908-0BB27/alternatives.json"},"ai":{"faq":[{"question":"What is the 3VM9908-0BB27 used for?","answer":"It is an undervoltage release accessory for Siemens 3VM moulded-case circuit breakers up to 630 A. It trips the breaker when the supply voltage drops below the rated 440-480 V AC range, protecting downstream equipment from undervoltage conditions."},{"question":"What are the key specs of 3VM9908-0BB27?","answer":"Coil rated 440-480 V AC 50/60 Hz, 2.5 VA max draw, 4 kV surge withstand, overvoltage category III, pollution degree 3. Dimensions 28.8 x 25.7 x 65.1 mm. Stripped length 10 mm (0.4 in)."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VM9908-0BB27","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/3VM9908-0BB27 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}}