{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6406-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6406-6","canonicalUrl":"https://aoctrl.com/siemens/5SY6406-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6406-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6 series, miniature circuit breaker, 4-pole, 6 A, B characteristic, 6 kA (EN 60898) / 30 kA (IEC 60947-2), 400 V AC, 4 width units.","salesMarkdown":"## SENTRON 5SY6406-6 — 4-pole MCB, B-curve, 6 A The Siemens 5SY6406-6 is a 4-pole miniature circuit breaker from the SENTRON 5SY6 series, rated 6 A at 400 V AC with a B tripping characteristic. The B-curve trips at 3–5× rated current (18–30 A for this 6 A unit), so it's the right choice for resistive or general-purpose loads where inrush is modest — lighting, heaters, control transformers. Don't use it on motor circuits or high-inrush loads; that calls for a C or D curve. The 6 kA EN 60898 rating covers the standard domestic/commercial fault level; the 30 kA IEC 60947-2 rating confirms it can be applied in industrial panels with higher prospective fault current, as long as the installation complies with the industrial standard. Four poles (4P) means it switches and protects all three phases plus neutral. The neutral pole is switched but not inherently protected — confirm the neutral arrangement in your distribution board before specifying. Mount in any position; ambient range -25 to +55 °C.","metaTitle":"Siemens 5SY6406-6 SENTRON MCB, 4P, 6A, B-Curve, 6kA/30kA","metaDescription":"Siemens 5SY6406-6 SENTRON miniature circuit breaker, 4-pole, 6 A, B tripping characteristic, 6 kA (EN 60898) / 30 kA (IEC 60947-2). Active production, sourced to order. Request quo","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"72 mm","title":"5SY6406-6","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 400 V 6kA, 4-pole, B, 6 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"4","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +55 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Energy limiting class":"3","Number of width units":"4","Number of poles / Note":"4P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY6","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"6 A","Tripping characteristic class":"B","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"30 kA","Product feature / Touch protection":"Yes","Influence of the surrounding temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in","AWG number / as coded connectable conductor cross section":"18 ... 4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/fedde53019b362d50a4a453180c7141a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=302536&mlfb=5SY6406-6"},"ai":{"faq":[{"question":"Where can I buy the 5SY6406-6 and get a price?","answer":"This part is sourced and quoted to order against an RFQ. Submit a request through the storefront; availability and current pricing are confirmed at quote time."},{"question":"What is the breaking capacity of the 5SY6406-6 under IEC 60947-2?","answer":"30 kA at 400 V AC per IEC 60947-2, which qualifies it for industrial panels with higher prospective fault current. The EN 60898 rating is 6 kA."},{"question":"What wire sizes does the 5SY6406-6 accept?","answer":"Solid or stranded copper from 0.75 mm² up to 35 mm² at both the top and bottom combined terminals."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6406-6","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/5SY6406-6 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}