{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0BL33","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0BL33","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0BL33","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0BL33","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON auxiliary release / shunt trip, 3VA9978-0BL33, 208-277V AC 50/60Hz, 220-250V DC, 40 VA / 35 W, for 3VA4/5/6 breakers.","salesMarkdown":"The Siemens 3VA9978-0BL33 is a SENTRON shunt trip (auxiliary release) designed for the 3VA4, 3VA5, and 3VA6 molded-case breaker families. It provides remote tripping capability: apply 208–277 V AC (50/60 Hz) or 220–250 V DC to the coil, and the breaker opens — no manual intervention needed. That's the core function for emergency-stop circuits, interlocking schemes, or any panel where you need to kill power from a remote pushbutton or PLC output. The coil draws up to 40 VA apparent power on AC and 35 W active power on DC. The 3-slot design fits the accessory bay on the left side of the 3VA breaker. This is a snap-on accessory for the 3VA4/5/6 breaker family — it occupies the left-side slot and connects via the breaker's internal bus. No DIN-rail footprint of its own; it rides on the breaker. The stripped length for the coil wiring is 10 mm (0.4 in). Dimensions are 31.2 mm deep, 25.7 mm wide, 65.1 mm high — small enough that it doesn't change the breaker's mounting footprint or the panel fill factor.","metaTitle":"Siemens 3VA9978-0BL33 SENTRON Shunt Trip, 208-277V AC / 220-","metaDescription":"Siemens 3VA9978-0BL33 SENTRON shunt trip accessory for 3VA4/5/6 breakers. 208-277V AC / 220-250V DC, 40 VA max, active lifecycle. Sourced to order against RFQ.","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":"3VA9978-0BL33","Height":"65.1 mm","Maximum":"16","Minimum":"20","Accessories":"Auxiliary release","description":"shunt trip left 208-277V AC 50/60Hz 220-250V 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","Apparent Power Consumption / Maximum":"40 VA","consumed active power / at DC / maximum":"35 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/c5608c734c48dbfdf7de8660639e7aa0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650549&mlfb=3VA9978-0BL33"},"ai":{"faq":[{"question":"Where can I buy 3VA9978-0BL33 and get a price?","answer":"The 3VA9978-0BL33 is sourced to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What voltage does the 3VA9978-0BL33 shunt trip operate on?","answer":"It operates on 208–277 V AC at 50/60 Hz or 220–250 V DC, with a maximum apparent power consumption of 40 VA on AC and 35 W on DC."},{"question":"What is the 3VA9978-0BL33's depth?","answer":"The depth is 31.2 mm, with a width of 25.7 mm and a height of 65.1 mm."},{"question":"Which breakers does the 3VA9978-0BL33 fit?","answer":"It fits the Siemens SENTRON 3VA4, 3VA5, and 3VA6 molded-case breaker families, mounting in the left-side accessory slot."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9978-0BL33","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/3VA9978-0BL33 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}}