{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0BB14","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0BB14","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0BB14","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0BB14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON undervoltage release, 125-127 V DC, 2.5 W, for 3VA4/5/6 breakers, 3VA9978-0BB14.","salesMarkdown":"The Siemens SENTRON 3VA9978-0BB14 is an undervoltage release accessory for the 3VA4, 3VA5, and 3VA6 molded-case circuit breaker families. It drops the breaker when the control voltage falls below a threshold — standard practice for preventing motor restart after a sag or outage. Coil draws 2.5 W at its 125-127 V DC rating. Surge withstand is 4 kV. Mechanical footprint is 25.7 mm wide, 65.1 mm tall, 28.8 mm deep — it clips into the accessory slot on the 3VA breaker body, no extra DIN rail space needed. Wire termination accepts AWG 18 or 750 mm² (likely a misprint for 0.75 mm²) with a 10 mm strip length.","metaTitle":"Siemens SENTRON 3VA9978-0BB14 undervoltage release, 125-127","metaDescription":"Siemens SENTRON 3VA9978-0BB14 undervoltage release for 3VA4/5/6. 125-127 V DC, 2.5 W, 28.8 mm deep. Active product, sourced to order. RFQ for availability.","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":"3VA9978-0BB14","Height":"65.1 mm","Accessories":"Auxiliary release","description":"undervoltage release 125-127V DC accessory for: 3VA4/5/6","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","Type of auxiliary circuit connection":"AWG18 / 750 mm","consumed active power / at DC / maximum":"2.5 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d50e8202b12657050c210d89b314a166.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650522&mlfb=3VA9978-0BB14"},"ai":{"faq":[{"question":"What is the 3VA9978-0BB14 used for?","answer":"It is an undervoltage release for Siemens SENTRON 3VA4, 3VA5, and 3VA6 molded-case circuit breakers. It trips the breaker when the control voltage drops below the release threshold, protecting motors and other loads from an undervoltage condition."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9978-0BB14","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/3VA9978-0BB14 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-07-22T19:47:38.189Z","lastPublished":"2026-07-22T19:47:38.189Z","indexable":true}}