{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3646-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3646-0","canonicalUrl":"https://aoctrl.com/siemens/5SM3646-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3646-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCCB, 4-pole, 63 A, 300 mA AC type, instantaneous, 10 kA SCCR, 400 V AC, 50 Hz, IP20, DIN rail mount.","salesMarkdown":"The Siemens 5SM3646-0 is a 4-pole SENTRON residual-current circuit breaker (RCCB) rated for 63 A at 45 °C and 400 V AC, 50 Hz, with a 300 mA AC-type trip and a 10 kA short-circuit current rating. That 300 mA sensitivity is for general fault protection on a 4-wire system — not the 30 mA you'd spec for personal shock protection on a branch circuit. The supply can come from top or bottom, which is handy when you're retrofitting into an existing distribution board where the busbar is already landed. The thermal derating curve is published: holds 63 A up to 45 °C, then drops to 60.48 A at 50 °C, 57.96 A at 55 °C, 55.44 A at 60 °C, 52.92 A at 65 °C, and 50.4 A at 70 °C.","metaTitle":"Siemens 5SM3646-0 SENTRON RCCB, 4P, 63A, 300mA, 10kA","metaDescription":"Siemens 5SM3646-0 SENTRON 4-pole RCCB, 63 A rated at 45 °C, 300 mA AC type, 10 kA SCCR, IP20. 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":"-5 °C","Rated Value":"50 Hz","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"DIN rail (REG)","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","acc. to IEC 81346-2":"F","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Instantaneous","Residual Current Type":"AC","acc. to DIN EN 61346-2":"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","Short-Circuit Current Rating":"10 kA","Number Of Modular Width Units":"4","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","Tripping Fault Current / Rated Value":"300 mA","supply voltage / at AC / rated value":"400 V","according to IEC 61008-1 / rated value":"0.8 kA","Switching Function / Short-Term Delayed":"No","operational 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=412785&mlfb=5SM3646-0","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3646-0/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3646-0","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/5SM3646-0 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}}