{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0BL32","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0BL32","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0BL32","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0BL32","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON auxiliary release / shunt trip, left-side mount, 110-127 V AC 50/60 Hz / DC, for 3VA4/5/6 molded-case breakers, 3VA9978-0BL32.","salesMarkdown":"The Siemens 3VA9978-0BL32 is a left-side shunt trip (auxiliary release) for the 3VA4, 3VA5, and 3VA6 SENTRON molded-case circuit breaker families. It operates on 110-127 V AC 50/60 Hz or DC, drawing up to 40 VA (AC) or 40 W (DC) at maximum load. That power consumption is the peak the coil pulls during the trip event — steady-state draw is negligible, so it won't load the control transformer on a multi-breaker panel. The 31.2 mm depth, 25.7 mm width, and 65.1 mm height let it tuck into the left accessory slot of the breaker without crowding adjacent wiring. Snaps into the left-side accessory bay of the 3VA4/5/6 breaker frame. No DIN-rail footprint of its own — it's captive to the breaker once assembled. The three accessory slots on the breaker accept this shunt trip plus other auxiliaries; this unit occupies one slot. Stripped length of 10 mm (0.4 in) on the coil wires matches standard ferrule preparation for the breaker's terminal block.","metaTitle":"Siemens 3VA9978-0BL32 Shunt Trip, 110-127V AC/DC, SENTRON","metaDescription":"Siemens 3VA9978-0BL32 SENTRON shunt trip (auxiliary release) for 3VA4/5/6 breakers. 110-127V AC 50/60Hz/DC, 40 VA/W, 4 kV surge. Active production. 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":"3VA9978-0BL32","Height":"65.1 mm","Maximum":"16","Minimum":"20","Accessories":"Auxiliary release","description":"shunt trip left 110-127V AC 50/60Hz/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":"40 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$40.64","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/3811e7610c03e879443141f8fae1e3e1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650548&mlfb=3VA9978-0BL32"},"ai":{"faq":[{"question":"What is the closest functional second-source for 3VA9978-0BL32?","answer":"The 5SY4140-7 is a SENTRON miniature circuit breaker, not a shunt trip — it's a different class of device. No direct second-source exists for this specific left-side shunt trip; it mates only to the 3VA4/5/6 frame. The 5SY4140-7 shares the same brand and pollution degree but serves a completely different function."},{"question":"Where can I buy 3VA9978-0BL32?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time — no stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9978-0BL32","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/3VA9978-0BL32 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}}