{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"3VA9978-0CH72","brand":"Siemens","brandSlug":"siemens","productSlug":"3VA9978-0CH72","canonicalUrl":"https://aoctrl.com/siemens/3VA9978-0CH72","factsUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0CH72","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 3VA9978-0CH72, Bowden cable operator accessory, epoxy-sheathed steel cable, NEMA 1/3R/12, black=OFF red=ON.","salesMarkdown":"## Remote mechanical trip for 3VA breakers The Siemens 3VA9978-0CH72 is a Bowden cable operator — a remote mechanical actuator for SENTRON 3VA molded-case circuit breakers. It lets you open or close the breaker from a panel door or enclosure wall without running control wiring to the breaker itself. The assembly uses a single steel cable with an epoxy sheath, terminated at a rotary handle that shows black for OFF and red for ON. Rated NEMA 1, 3R, and 12, the operator is suited for indoor enclosures where dust, falling dirt, and dripping water are present — typical for industrial control panels and light commercial distribution boards. ## What the NEMA rating means for fit NEMA 1 covers general-purpose indoor use with protection against contact and falling dirt. NEMA 3R adds rain and sleet resistance for outdoor enclosures. NEMA 12 includes protection against circulating dust, lint, and dripping non-corrosive liquids. The epoxy-sheathed cable is the key — it resists moisture and corrosion better than bare steel, so the operator holds up in washdown-adjacent areas or humid environments where a standard cable would rust and bind.","metaTitle":"Siemens 3VA9978-0CH72 SENTRON Bowden Cable Operator, NEMA 1/","metaDescription":"Siemens 3VA9978-0CH72 SENTRON accessory: Bowden cable operator with epoxy-sheathed steel cable. NEMA 1, 3R, 12 rated. Current production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Circuit Breaker Accessories"],"specifications":{"Accessories":"Bowden cable operator","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=650553&mlfb=3VA9978-0CH72","alternativesUrl":"https://aoctrl.com/api/mcp/products/3VA9978-0CH72/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 3VA9978-0CH72 and how do I get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"What is the Bowden cable operator on this component line?","answer":"It is a remote mechanical actuator for SENTRON 3VA breakers, using an epoxy-sheathed steel cable with a rotary handle (black=OFF, red=ON) rated NEMA 1, 3R, and 12."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/3VA9978-0CH72","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/3VA9978-0CH72 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}}