{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"A9KF21120BQ","brand":"Schneider Electric","brandSlug":"schneider","productSlug":"A9KF21120BQ","canonicalUrl":"https://aoctrl.com/schneider/A9KF21120BQ","factsUrl":"https://aoctrl.com/api/mcp/products/A9KF21120BQ","rawCanonicalId":null},"summary":{"shortDescription":"Schneider Electric Acti9 K60 miniature circuit breaker, A9KF21120BQ, 1P, 20 A, B-curve, 10 kA breaking capacity, DIN rail mount.","salesMarkdown":"The Schneider Electric A9KF21120BQ is a 1-pole Acti9 K60 miniature circuit breaker (MCB) rated 20 A with a B-curve, designed for AC distribution in final subcircuits. It snaps onto a DIN rail (18 mm width per pole) and provides thermal-magnetic overcurrent protection per EN/IEC 60898-1. ## B-curve tripping and what it means on the line The B-curve (magnetic trip at 3 to 5 times the rated current, or 60 to 100 A for this 20 A unit) is the standard choice for resistive and general-purpose loads — lighting, small heaters, control transformers — where inrush is low. It holds through the 20 A continuous load and trips fast on a hard short. The thermal element handles sustained overloads; the magnetic element clears the fault. At 20 000 electrical cycles and the same mechanical endurance, this MCB is rated for routine switching in addition to protection duty. Mounts on DIN rail, fixed position. Tunnel terminals accept 1 to 25 mm² rigid or 1 to 16 mm² flexible copper; strip 14 mm and torque to 2 N·m.","metaTitle":"Schneider Electric A9KF21120BQ Acti9 K60 MCB, 20 A, Curve B,","metaDescription":"Schneider Electric A9KF21120BQ Acti9 K60 miniature circuit breaker, 20 A rated current, B-curve, 10 kA breaking capacity per EN/IEC 60898-1. 1P, DIN rail mount. Current production.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"70 mm","Range":"Acti9","Width":"18 mm","Colour":"White","Height":"81 mm","Standards":"EN/IEC 60898-1","Curve code":"B","9 Mm Pitches":"2","Control type":"Toggle","Network type":"AC","Product name":"Acti9 K60","Mounting mode":"Fixed","Tropicalisation":"2 conforming to IEC 60068-1","lifecycle_stage":"current","Limitation class":"3 conforming to EN/IEC 60898-1","Local signalling":"Without","Mounting support":"DIN rail","Pollution degree":"2","Quantity per set":"Set of 12","Breaking capacity":"10000 A Icn at 240 V AC 50/60 Hz conforming to EN/IEC 60898-1","Device short name":"K60H","Network frequency":"50/60 Hz","Poles description":"1P","Relative humidity":"95 % at 55 °C","Tightening torque":"2 N.m top or bottom","Device application":"Distribution","Operating altitude":"0...2000 m","[In] rated current":"20 A","Overvoltage category":"II","Trip unit technology":"Thermal-magnetic","Electrical durability":"20000 cycles","Mechanical durability":"20000 cycles","Wire stripping length":"14 mm for top or bottom connection","Connections - terminals":"Tunnel type terminals (downstream) 1...25 mm² rigid Tunnel type terminals (upstream) 1...25 mm² rigid Tunnel type terminals (downstream) 1...16 mm² flexible Tunnel type terminals (upstream) 1...16 mm² flexible","IP degree of protection":"IP20 conforming to IEC 60529","Magnetic tripping limit":"3...5 x In","Earth-leakage protection":"Without","Number of protected poles":"1","Product or component type":"Miniature circuit-breaker","Suitability for isolation":"Yes conforming to EN/IEC 60898-1","Contact position indicator":"No","[Ui] rated insulation voltage":"500 V AC 50/60 Hz","Ambient air temperature for storage":"-25...85 °C","Ambient air temperature for operation":"-5...55 °C","[Ics] rated service breaking capacity":"7500 A 75 % conforming to EN/IEC 60898-1 - 240 V AC 50/60 Hz","[Uimp] rated impulse withstand voltage":"4 kV","Comb busbar and distribution block compatibility":"Downstream: biconnect"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://www.se.com/in/en/product/A9KF21120BQ/acti-9-k60h-1p-20-a-b-curve-10-ka-set-of-12/","alternativesUrl":"https://aoctrl.com/api/mcp/products/A9KF21120BQ/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy A9KF21120BQ and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote (RFQ) to confirm current availability and pricing at the time of your order."},{"question":"What is the breaking capacity of A9KF21120BQ?","answer":"The breaking capacity is 10 000 A (Icn) at 240 V AC, 50/60 Hz, certified per EN/IEC 60898-1. This is the maximum fault current the breaker can safely interrupt under standard test conditions."},{"question":"What compliance documentation does Schneider provide for A9KF21120BQ?","answer":"The MCB is certified to EN/IEC 60898-1 and carries tropicalisation class 2 per IEC 60068-1. Standard Schneider documentation includes a declaration of conformity covering the applicable EU directives; specific RoHS/REACH declarations are available from the manufacturer upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/schneider/A9KF21120BQ","citationPolicyUrl":"https://aoctrl.com/llms.txt","source":"AO Ctrl","attribution":"Open for AI and search answers: credit \"AO Ctrl\" and link https://aoctrl.com/schneider/A9KF21120BQ 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}}