{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3646-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3646-8","canonicalUrl":"https://aoctrl.com/siemens/5SM3646-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3646-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCCB, 4-pole, 63 A rated at 40 °C, 400 V AC, Type A, selective, DIN rail (REG), IP20.","salesMarkdown":"The Siemens SENTRON 5SM3646-8 is a 4-pole residual current circuit breaker (RCCB) rated 63 A at 40 °C, 400 V AC, 50 Hz. The selective design (time-delayed) means it coordinates with downstream RCCBs: on a fault, the downstream unit trips first, keeping upstream circuits live — critical for a distribution board feeding multiple sub-panels or machine cells where you want nuisance trips isolated to the faulted branch. Rated 63 A at 40 °C and 63 A at 45 °C — no derating needed in a typical 40 °C panel ambient. At 50 °C it derates to 60.48 A, at 60 °C to 55.44 A, and at 70 °C to 50.4 A. If your panel runs hot, size the upstream breaker accordingly. The I²t let-through is 70 000 A²·s, and the permissible let-through current is 7 500 kA — these matter for coordination with the upstream MCB or fuse. Mounts on DIN rail (REG), occupies 4 width units — 72 mm wide, 90 mm tall, 77 mm deep, with an installation depth of 70 mm. Finger and back-of-hand safe per IP20 once the distribution board is installed and conductors connected.","metaTitle":"Siemens SENTRON 5SM3646-8 RCCB, 4P, 63 A, 400 V AC, Type A,","metaDescription":"Siemens SENTRON 5SM3646-8 RCCB, 4-pole, 63 A rated at 40 °C, 400 V AC, Type A, selective, DIN rail. Sourced to order against an RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Width":"72 mm","Height":"90 mm","Maximum":"45 °C","Minimum":"-25 °C","Rated Value":"50 Hz","Mounting Type":"DIN rail (REG)","Number Of Poles":"4","lifecycle_stage":"current","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Operating Frequency":"50 Hz","Product Designation":"RCCB","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Selective","Number Of Width Units":"4","Type Of Fault Current":"A","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","I2t value / permissible":"70 000 A²·s","at 40 °C / rated value":"63 A","at 45 °C / rated value":"63 A","at 50 °C / rated value":"60.48 A","at 55 °C / rated value":"57.96 A","at 60 °C / rated value":"55.44 A","at 65 °C / rated value":"52.92 A","at 70 °C / rated value":"50.4 A","Product Feature / Silicon-Free":"Yes","acc. to EN 60898 / rated value":"0.8 kA","Position / Of Power Supply Cord":"top or bottom","Let-Through Current / Permissible":"7 500 kA","Protection Against Electrical Shock":"Finger and back-of-hand safe","supply voltage / at AC / rated value":"400 V","Surge Current Resistance / Rated Value":"5 kA","according to IEC 61008-1 / rated value":"0.8 kA","Switching Function / Short-Term Delayed":"No","Tripping Residual Current / Rated Value":"300 mA","operating current / at AC / rated value":"63 A","Supply Voltage / For Testing Equipment / Minimum":"100 V","size of installation devices / acc. to DIN 43880":"1","Mechanical Service Life (Switching 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=28827&mlfb=5SM3646-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3646-8/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3646-8","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/5SM3646-8 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}}