{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0BF23","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0BF23","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0BF23","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0BF23","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA9978-0BF23 time-delay device, fixed 100 ms OFF-delay, 24 V DC, accessory for 3VA UL undervoltage release, 72.3 mm depth, 44.8 mm width, 57.5 mm height.","salesMarkdown":"The Siemens SENTRON 3VA9978-0BF23 is a fixed-delay time-delay device, a 24 V DC accessory designed to pair with the 3VA UL undervoltage release. It provides a minimum OFF-delay time of 100 ms, which means the undervoltage release holds the breaker closed for that window after control power drops — enough to ride through a brief sag without nuisance tripping the line. That's the whole point of this accessory: it keeps the SENTRON 3VA molded-case breaker from dropping out on a momentary dip that the process can survive. Mechanically, it clips onto the 3VA breaker's accessory slot — no extra DIN-rail real estate needed. The body measures 72.3 mm deep by 44.8 mm wide by 57.5 mm high, so it stays within the breaker's own envelope. Wiring lands with a 10 mm strip length (0.4 in), which is the standard termination for the spring-cage terminals on these SENTRON accessories. That means this order code is the current production part, not a superseded variant.","metaTitle":"Siemens 3VA9978-0BF23 SENTRON Time-Delay Device, 100 ms OFF-","metaDescription":"Siemens 3VA9978-0BF23 SENTRON time-delay device, fixed 100 ms OFF-delay, 24 V DC, for 3VA UL undervoltage release. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"72.3 mm","Width":"44.8 mm","Height":"57.5 mm","Maximum":"16","Minimum":"20","Accessories":"Time-delay device","Stripped Length":"10 mm","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Accessories","Stripped Length [In]":"0.4 in","Design Of The Product":"Time-delay device","OFF-delay time / minimum":"100 ms"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650542&mlfb=3VA9978-0BF23","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0BF23/alternatives.json"},"ai":{"faq":[{"question":"What is 3VA9978-0BF23 used for?","answer":"It is a fixed-delay time-delay device accessory for the Siemens SENTRON 3VA UL undervoltage release. It provides a minimum 100 ms OFF-delay, preventing the breaker from tripping on brief voltage sags."},{"question":"Where can I buy 3VA9978-0BF23?","answer":"This part is sourced and quoted 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/3VA9978-0BF23","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/3VA9978-0BF23 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}}