{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9908-0BB27","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9908-0BB27","canonicalUrl":"https://aoctrl.com/siemens/3VA9908-0BB27","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9908-0BB27","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON undervoltage release, 440-480 VAC 50/60 Hz, accessory for 3VA1 and 3VA20 up to 3VA25, 2.5 VA, 28.8 mm depth.","salesMarkdown":"The Siemens 3VA9908-0BB27 is an undervoltage release for SENTRON 3VA molded-case circuit breakers — specifically the 3VA1 and 3VA20 through 3VA25 frames. Coil burden is 2.5 VA at rated voltage, so the control transformer feeding it needs to cover that draw plus any other loads on the same circuit. Rated 440–480 V AC 50/60 Hz — this is the coil operating range, not a contact rating. If your control voltage sits outside that band (e.g. 380 V or 500 V), the release won't hold in or may overheat. The 4 kV surge voltage resistance (overvoltage category III) means it's suitable for fixed-installation distribution panels where transient overvoltages from the mains are expected. Pollution degree 3 confirms it's rated for conductive dust and humidity typical of industrial enclosures — not clean-room or residential. Footprint is 65.1 mm high × 25.7 mm wide × 28.8 mm deep — it clips into the breaker's accessory slot, not onto DIN rail directly. The 10 mm (0.4 in) stripped length is the wire prep for the screw terminals; use ferruled stranded or solid copper. Three accessory slots on the breaker frame mean you can stack this undervoltage release with a shunt trip or auxiliary switch in the same breaker, but check the slot assignment in the 3VA mounting guide. The 3VA9908-0BB27 carries an active lifecycle status from Siemens.","metaTitle":"Siemens 3VA9908-0BB27 SENTRON Undervoltage Release, 440-480","metaDescription":"Siemens SENTRON 3VA9908-0BB27 undervoltage release for 3VA1/3VA20-3VA25 breakers. Rated 440-480 VAC 50/60 Hz, 2.5 VA. Active production, sourced to order. Request quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"28.8 mm","Width":"25.7 mm","title":"3VA9908-0BB27","Height":"65.1 mm","Maximum":"16","Minimum":"20","Accessories":"Auxiliary release","description":"UNDERVOLTAGE RELEASE 440-480 V AC 50/60 HZ ACCESSORY FOR 3VA1 and 3VA20 up to 3VA25","Number Of Slots":"3","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","Design Of The Product":"auxiliary release","Surge Voltage Resistance":"4 kV","Apparent Power Consumption / Maximum":"2.5 VA"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/0f3df7892a11e3b7d99c29ca370f44e9.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=178094&mlfb=3VA9908-0BB27"},"ai":{"faq":[{"question":"What is the 3VA9908-0BB27 used for?","answer":"It is an undervoltage release accessory for Siemens SENTRON 3VA1 and 3VA20 through 3VA25 molded-case circuit breakers. It trips the breaker when the control voltage drops below the release's dropout threshold."},{"question":"Where can I buy the 3VA9908-0BB27?","answer":"The 3VA9908-0BB27 is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time."},{"question":"What are the key ratings of the 3VA9908-0BB27?","answer":"Coil rated 440–480 V AC 50/60 Hz, apparent power consumption 2.5 VA, surge voltage resistance 4 kV, pollution degree 3, overvoltage category III. Dimensions: 65.1 × 25.7 × 28.8 mm."},{"question":"Will the 3VA9908-0BB27 fit a panel built around the 5SY4140-7?","answer":"No — the 5SY4140-7 is a SENTRON miniature circuit breaker (MCB), not a 3VA molded-case breaker. The 3VA9908-0BB27 is an accessory designed for the 3VA1 and 3VA20–3VA25 frame only; it will not mechanically or electrically fit an MCB."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9908-0BB27","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/3VA9908-0BB27 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}