{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9278-0CK12","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9278-0CK12","canonicalUrl":"https://aoctrl.com/siemens/3VA9278-0CK12","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9278-0CK12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, Accessories, Max-Flex kit, Bowden wire actuator, NEMA 1/3R/12, 0.9m cable, for 3VA5 250 and 3VA6 150/250 breakers.","salesMarkdown":"The Siemens 3VA9278-0CK12 is a SENTRON Max-Flex remote operator kit — a Bowden wire actuator that lets you mount the breaker handle on an enclosure door while the breaker body stays inside, up to 0.9 m (36 inches) away. The kit is complete: steel handle with an epoxy sheath, the Bowden cable, and the switching mechanism that interfaces with the breaker. It is rated NEMA 1, 3R, and 12, meaning the handle assembly is suitable for indoor (NEMA 1), outdoor rainproof (NEMA 3R), and dust-tight / drip-tight industrial (NEMA 12) enclosures — a single handle that covers a range of panel environments without needing separate gasketed variants. ## Compatible breakers and integration note This kit is designed for Siemens 3VA5 250 A frames and 3VA6 150/250 A frames. The switching mechanism clips onto the breaker's rotary handle interface; the Bowden cable routes through a gland plate or knockout, and the steel handle mounts on the door. The 0.9 m cable length gives enough slack for a standard-depth enclosure with the breaker mounted on a back panel. If you are retrofitting an existing panel that was built around a 3VA5 or 3VA6, this kit drops in without rewiring — the breaker itself stays in place, and you add only the mechanical linkage. ## What the NEMA ratings mean for deployment NEMA 1 covers general-purpose indoor use where falling dirt and light splash are the concern. NEMA 3R adds rainproof and sleet-resistant construction — the handle assembly can live on an outdoor enclosure wall without weather damage. NEMA 12 is the industrial workhorse: dust-tight and drip-tight, so the handle survives washdowns and airborne particulates common in food processing, packaging, and machining lines. The epoxy sheath on the steel handle resists corrosion better than painted steel, which matters in NEMA 12 environments where cleaning chemicals are routine.","metaTitle":"Siemens 3VA9278-0CK12 SENTRON Max-Flex Bowden Wire Kit, NEMA","metaDescription":"Siemens 3VA9278-0CK12 SENTRON Max-Flex operator kit with 0.9m Bowden cable. NEMA 1/3R/12 steel handle. For 3VA5 250 & 3VA6 150/250 breakers. Current lifecycle stage. Quoted to orde","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Circuit Breaker Accessories"],"specifications":{"Accessories":"Max-Flex kit","Product version":"Bowden wire actuator","lifecycle_stage":"current","Product Brand Name":"SENTRON","Product Designation":"Accessories","degree of protection NEMA rating":"NEMA 1, 3R, 12"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$434.34","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650384&mlfb=3VA9278-0CK12","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9278-0CK12/alternatives.json"},"ai":{"faq":[{"question":"What breakers does the 3VA9278-0CK12 Max-Flex kit fit?","answer":"It fits Siemens 3VA5 250 A frames and 3VA6 150/250 A frames. The kit includes the handle, Bowden cable, and switching mechanism — everything needed for a door-mounted operator."},{"question":"What is the 3VA9278-0CK12's NEMA rating and where can it be installed?","answer":"The handle assembly carries NEMA 1 (indoor), 3R (outdoor rainproof), and 12 (dust-tight / drip-tight) ratings. It can be mounted on enclosures in any of those environments without additional gasketing."},{"question":"Where can I buy the 3VA9278-0CK12 and how is it quoted?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or price is published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9278-0CK12","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/3VA9278-0CK12 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}}