{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4405-7KK11","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4405-7KK11","canonicalUrl":"https://aoctrl.com/siemens/5SY4405-7KK11","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4405-7KK11","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4405-7KK11 miniature circuit breaker, 4-pole, C characteristic, 0.5 A, 10 kA (EN 60898) / 35 kA (IEC 60947-2), IP20, for railway applications.","salesMarkdown":"## Breaking capacity and selectivity The 10 kA rating under EN 60898 covers domestic and light commercial installations; the 35 kA rating under IEC 60947-2 is the figure you use for industrial coordination studies. That 35 kA IEC rating means this breaker can sit upstream of smaller MCBs in a distribution board without needing a current-limiting fuse ahead of it — it self-limits the let-through energy to Energy Limitation Class 3. For a 0.5 A C-curve device, that is unusually high interrupting capacity; most 0.5 A MCBs top out around 6–10 kA. The C-curve trips between 5 and 10 times rated current, so it handles moderate inrush from small transformers or capacitive loads without nuisance tripping. ## Mounting and panel integration Snaps onto DIN rail via the quick assembly system in any mounting position. Occupies 4 modular width units — 72 mm wide — and requires 70 mm installation depth behind the panel surface, with the device body 76 mm deep. Combined terminals top and bottom accept both busbar and conductor; the sealable design lets you lock the toggle position after commissioning. IP20 with connected conductors is standard for enclosed distribution boards — no special sealing needed inside the cabinet.","metaTitle":"Siemens 5SY4405-7KK11 SENTRON MCB, 4P C 0.5A, 10kA/35kA","metaDescription":"Siemens 5SY4405-7KK11 SENTRON miniature circuit breaker, 4-pole, C-curve, 0.5 A, 10 kA (EN 60898) / 35 kA (IEC 60947-2), -40 to 75 °C, IP20, for railway applications. Available to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"4","Type Of Voltage":"AC","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"0.5 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Design Of The Product":"For railway applications","Number Of Poles / Note":"4P","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 35 °C / rated value":"0.5 A","at 40 °C / rated value":"0.48 A","at 45 °C / rated value":"0.46 A","at 50 °C / rated value":"0.45 A","at 55 °C / rated value":"0.44 A","at 60 °C / rated value":"0.42 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"35 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","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","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"No","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"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=106577&mlfb=5SY4405-7KK11","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4405-7KK11/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4405-7KK11?","answer":"10 kA per EN 60898 and 35 kA per IEC 60947-2. The 35 kA IEC figure is the one to use for industrial coordination studies."},{"question":"Will 5SY4405-7KK11 drop into a panel specified around 5SY4304-7CV?","answer":"Both are 4-pole SENTRON MCBs with the same DIN-rail footprint and 4-module width, so physical fit is identical. The difference is rating: 5SY4405-7KK11 is 0.5 A C-curve; 5SY4304-7CV is a different current/curve. Check your BOM's ampacity and trip characteristic before substituting."},{"question":"Where can I buy 5SY4405-7KK11 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."},{"question":"What compliance documentation does Siemens provide for 5SY4405-7KK11?","answer":"The part carries the SENTRON brand and is designed to EN 60898 and IEC 60947-2. It is halogen-free and silicon-free. Standard Siemens declarations for RoHS, REACH, and CE are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4405-7KK11","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/5SY4405-7KK11 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}}