{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VM9908-0BB22","brand":"Siemens","brandSlug":"siemens","productSlug":"3VM9908-0BB22","canonicalUrl":"https://aoctrl.com/siemens/3VM9908-0BB22","factsUrl":"https://aoctrl.com/api/mcp/products/3VM9908-0BB22","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VM9908-0BB22 undervoltage release, 60V AC 50/60Hz, 2VA, for 3VM circuit breakers up to 630A.","salesMarkdown":"## What it is and where it fits The Siemens 3VM9908-0BB22 is an undervoltage release accessory for the SENTRON 3VM molded-case circuit breaker family, rated for breakers up to 630 A. It trips the breaker when control voltage drops below the dropout threshold, providing undervoltage protection for motor feeders, conveyor drives, or any load that must not auto-reclose after a supply dip. The release operates on a 60 V AC control supply at 50/60 Hz, drawing a maximum apparent power of 2 VA. Its rated insulation voltage is 690 V, with a surge voltage resistance of 4 kV and overvoltage category III — suitable for fixed-installation distribution panels where transient overvoltages are expected. ## Mounting and panel integration The 3VM9908-0BB22 occupies three accessory slots on the 3VM breaker. Its dimensions — 25.7 mm wide, 65.1 mm high, 28.8 mm deep — fit within the standard breaker footprint; no additional DIN-rail space is needed beyond the breaker itself. Wire stripping length is 10 mm (0.4 in) for the control connections. Pollution degree 3 rating means the release is designed for industrial environments where conductive pollution or dry non-conductive pollution that becomes conductive due to condensation may occur. This aligns with typical panel environments in factories, mills, and processing plants. ## Lifecycle and sourcing As a current-production accessory, the 3VM9908-0BB22 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time.","metaTitle":"Siemens 3VM9908-0BB22 SENTRON Undervoltage Release, 60V AC","metaDescription":"Siemens 3VM9908-0BB22 SENTRON undervoltage release accessory for 3VM breakers to 630A. 60V AC 50/60Hz, 2VA, 690V Ui, pollution degree 3. Active lifecycle, available 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","lifecycle_stage":"current","Product brand name":"SENTRON","Degree of pollution":"3","Product designation":"Accessories","Overvoltage category":"III","Wire stripping length":"10 mm","Surge voltage resistance":"4 kV","Wire stripping length [in]":"0.4 in","Rated insulation voltage Ui":"690 V","Control supply voltage (Us) / at AC":"60 V 50/60 Hz","Apparent power consumption / maximum":"2 V·A"}},"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=575129&mlfb=3VM9908-0BB22","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VM9908-0BB22/alternatives.json"},"ai":{"faq":[{"question":"What is the 3VM9908-0BB22 used for?","answer":"It is an undervoltage release accessory for Siemens SENTRON 3VM circuit breakers up to 630 A. When control voltage drops below the dropout threshold, it trips the breaker to prevent auto-reclosure after a supply dip."},{"question":"What are the key electrical ratings of the 3VM9908-0BB22?","answer":"The release operates on a 60 V AC control supply at 50/60 Hz, draws 2 VA maximum apparent power, and has a rated insulation voltage of 690 V with 4 kV surge voltage resistance."},{"question":"Where can I buy the 3VM9908-0BB22?","answer":"The 3VM9908-0BB22 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VM9908-0BB22","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/3VM9908-0BB22 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}}