{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0BA20","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0BA20","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0BA20","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0BA20","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, auxiliary release shunt trip, 3VA9978-0BA20, 24 V AC 50/60 Hz, 340 VA, 3 slots, 31.2 × 21.7 × 65.1 mm, pollution degree 3, overvoltage category III.","salesMarkdown":"The Siemens SENTRON 3VA9978-0BA20 is a shunt trip auxiliary release designed as a snap-in accessory for 3VA4 molded-case breakers and 3VA51 through 3VA54, plus 3VA61 through 3VA64 frames. The part occupies three accessory slots on the breaker, so verify slot availability on the base unit before specifying. Dimensions are 31.2 mm deep by 21.7 mm wide by 65.1 mm tall; the stripped length for wiring is 10 mm (0.4 in). ## Integration note — wiring and panel fit Wire termination requires a 10 mm strip length. The accessory slots accept the shunt trip module without additional DIN-rail space — it mounts directly onto the breaker's side accessory bay. The 340 VA inrush is a pulse, not a hold-in load — the coil drops out after the trip mechanism operates. Size the control transformer and wiring for that peak draw if multiple shunt trips fire simultaneously in a coordinated trip scheme.","metaTitle":"Siemens 3VA9978-0BA20 SENTRON Shunt Trip, 24 V AC, 3 Slots","metaDescription":"Siemens SENTRON 3VA9978-0BA20 shunt trip auxiliary release for 3VA4/3VA5/3VA6 breakers. 24 V AC 50/60 Hz, 340 VA, pollution degree 3, overvoltage cat III. Active production, quoted","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Circuit Breaker Accessories"],"specifications":{"Depth":"31.2 mm","Width":"21.7 mm","Height":"65.1 mm","Maximum":"16","Minimum":"20","Accessories":"Auxiliary release","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":"340 VA"}},"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=650513&mlfb=3VA9978-0BA20","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0BA20/alternatives.json"},"ai":{"faq":[{"question":"What is the 3VA9978-0BA20 used for?","answer":"It is a shunt trip auxiliary release that remotely trips a compatible SENTRON 3VA4, 3VA5, or 3VA6 circuit breaker when 24 V AC is applied. Common in emergency-stop circuits, remote shutdown interlocks, and automated power distribution systems."},{"question":"What are the key dimensions of the 3VA9978-0BA20?","answer":"The shunt trip measures 31.2 mm deep, 21.7 mm wide, and 65.1 mm tall. It occupies three accessory slots on the breaker and requires a 10 mm (0.4 in) stripped wire length for termination."},{"question":"What compliance documentation is available for the 3VA9978-0BA20?","answer":"As a Siemens SENTRON accessory, the 3VA9978-0BA20 is designed to meet applicable IEC and UL standards for the host breaker series. Specific RoHS, REACH, and UL documentation is available from Siemens upon request or through the product's official documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9978-0BA20","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/3VA9978-0BA20 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}}