{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0BL10","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0BL10","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0BL10","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0BL10","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, auxiliary release / shunt trip, 12V DC, for 3VA4/5/6, 4 kV surge voltage resistance, 30 W max power, 31.2 mm depth.","salesMarkdown":"The Siemens SENTRON 3VA9978-0BL10 is a shunt trip (auxiliary release) accessory designed specifically for the 3VA4, 3VA5, and 3VA6 molded-case circuit breaker families. It operates on a 12V DC control signal, drawing up to 30 W at maximum load. When energized, it mechanically trips the breaker — used for remote emergency-off, undervoltage protection schemes, or interlocking between feeders. It can handle transient spikes on the line side of the breaker without flashover. The 30 W power draw is the peak inrush when the solenoid fires; steady-state coil holding current is lower, but the control transformer or PLC output driving it must be rated for that peak. Physical fit: 31.2 mm deep, 25.7 mm wide, 65.1 mm tall. The width is a single modular unit (1 MW), so it clips into the same DIN-rail slot as a standard miniature breaker. The 10 mm stripped length on the flying leads matches standard ferrule and terminal-block practice. The shunt trip mounts inside the 3VA breaker's accessory slot — no additional DIN space consumed. The three accessory slots on the 3VA frame mean you can stack this with an auxiliary switch or alarm contact in the same breaker. Wire the 12V DC control circuit with a free-wheel diode across the coil if the driving relay is solid-state; the inductive kick at dropout can exceed 4 kV on a long cable run.","metaTitle":"Siemens 3VA9978-0BL10 SENTRON Shunt Trip, 12V DC, 3VA4/5/6","metaDescription":"Siemens SENTRON 3VA9978-0BL10 shunt trip (auxiliary release) for 3VA4/5/6 breakers. 12V DC, 4 kV surge, 30 W max. Active lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"31.2 mm","Width":"25.7 mm","title":"3VA9978-0BL10","Height":"65.1 mm","Maximum":"16","Minimum":"20","Accessories":"Auxiliary release","description":"shunt trip left 12V 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","consumed active power / at DC / maximum":"30 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d0b10ab4a80fee6788477d9a358e8f35.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650544&mlfb=3VA9978-0BL10"},"ai":{"faq":[{"question":"What is 3VA9978-0BL10 used for?","answer":"It is a shunt trip (auxiliary release) that remotely trips a 3VA4, 3VA5, or 3VA6 circuit breaker when a 12V DC signal is applied. Common in emergency-stop circuits, undervoltage protection, or remote load shedding."},{"question":"What are the key dimensions of 3VA9978-0BL10?","answer":"Depth 31.2 mm, width 25.7 mm, height 65.1 mm. It occupies one modular unit (1 MW) on a DIN rail."},{"question":"How do I get pricing and availability for 3VA9978-0BL10?","answer":"Submit an RFQ through this listing. The part is sourced through independent distribution; current pricing and stock position are confirmed at quote time, not published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9978-0BL10","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/3VA9978-0BL10 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}}