{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3646-8KL","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3646-8KL","canonicalUrl":"https://aoctrl.com/siemens/5SM3646-8KL","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3646-8KL","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, Type A selective, 63 A rated current, 300 mA tripping residual current, 400 V AC, 50 Hz, DIN rail mount.","salesMarkdown":"The selective design means it coordinates with downstream RCCBs — it holds through short-duration earth faults to let the downstream device clear first, which keeps upstream circuits live on a faulted branch. Mounts on DIN rail (REG), occupies 4 width units (72 mm), and accepts conductors from 1.5 to 25 mm² solid or stranded. The N-left variant positions the neutral on the left side of the device. Selective (time-delayed) RCCBs are the backbone of graded earth-fault protection in distribution boards. The 5SM3646-8KL is designed to delay its trip long enough for a downstream non-selective RCCB to clear a fault first — typically up to several hundred milliseconds. This avoids a full-panel blackout when a single branch faults. If your installation has three-phase rectifiers or single-phase electronics, Type A is the minimum required by IEC 60364. The 300 mA tripping threshold is typical for fire protection or sub-distribution where nuisance tripping from leakage currents must be avoided — it is not for direct personal shock protection (30 mA is the standard for that). Tightening torque is 2.5 to 3 N·m. Overvoltage category III. Finger and back-of-hand safe per the protection against electrical shock classification. Silicon-free construction.","metaTitle":"Siemens 5SM3646-8KL SENTRON RCCB, 4-pole, 63 A, 300 mA, Type","metaDescription":"Siemens 5SM3646-8KL SENTRON RCCB, 4-pole, Type A selective, 63 A, 300 mA, 400 V AC, 50 Hz, DIN rail mount. Current lifecycle stage. Available to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 mm","Solid":"1.5 ... 25 mm²","Width":"72 mm","Height":"90 mm","Stranded":"1.5 ... 25 mm²","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","During Storage":"-40 ... +75 °C","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product variations":"N left","Ambient temperature":"-25 ... +45 °C","Operating frequency":"50Hz","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","circuit-breaker / Design":"5SM3","Current / at AC / rated value":"63 A","Product feature / silicon-free":"Yes","Position / of power supply cord":"top or bottom","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","Switching function / short-term delayed":"No","Tripping residual current / rated value":"300 mA","Tightening torque / with screw-type terminals":"2.5 ... 3 N·m","Size of installation devices / acc. to DIN 43880":"1","Supply voltage / for testing equipment / minimum":"100 V","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=238219&mlfb=5SM3646-8KL","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3646-8KL/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3646-8KL and how do I get a price?","answer":"The 5SM3646-8KL is sourced and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is 5SM3646-8KL's listed depth?","answer":"The overall depth is 77 mm; installation depth (behind the panel face) is 70 mm."},{"question":"What conductor sizes does 5SM3646-8KL accept?","answer":"It accepts solid or stranded copper conductors from 1.5 to 25 mm²."},{"question":"What compliance documentation does Siemens provide for 5SM3646-8KL?","answer":"The product is silicon-free and carries the SENTRON brand. Standard Siemens declarations for RoHS, REACH, and applicable IEC/EN standards are available through the manufacturer's documentation portal."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3646-8KL","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/5SM3646-8KL 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}}