{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3446-8LA","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3446-8LA","canonicalUrl":"https://aoctrl.com/siemens/5SM3446-8LA","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3446-8LA","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, Type A, selective, In: 63 A, 100 mA, Un AC: 400 V, with thermal overload protection.","salesMarkdown":"The Siemens SENTRON 5SM3446-8LA is a 4-pole residual current operated circuit breaker (RCCB) rated 63 A at 400 V AC, with a 100 mA trip threshold and Type A fault current sensitivity. The 100 mA rating means it's selective — it will not trip on a ground fault that a downstream 30 mA RCCB should clear, so only the faulted branch is isolated and the rest of the distribution board stays live. It includes thermal overload protection, so it also guards against sustained overcurrents, not just leakage — a feature that saves an extra protective device in the same DIN-rail slot. Mounting position is any — vertical, horizontal, upside-down — no derating needed for orientation. Terminals accept solid or stranded conductors from 1.5 to 25 mm²; tighten to 2.5–3 N·m. Overvoltage category III means it's rated for fixed-installation distribution level, not for downstream equipment.","metaTitle":"Siemens SENTRON 5SM3446-8LA RCCB, 4P, 63A, 100mA, Type A Sel","metaDescription":"Siemens SENTRON 5SM3446-8LA RCCB, 4-pole, Type A, selective, 63 A, 100 mA, 400 V AC. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Solid":"1.5 ... 25 mm²","Stranded":"1.5 ... 25 mm²","Rated Value":"50 Hz","Wertebereich":"-25 ... +45 °C","Mounting type":"DIN rail (REG)","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product variations":"With thermal overload protection","Ambient temperature":"-40 ... +75 °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","circuit-breaker / Design":"5SM3","Short-circuit current rating":"10 kA","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":"100 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=307925&mlfb=5SM3446-8LA","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3446-8LA/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SM3446-8LA and get a price?","answer":"This part is sourced to order against an RFQ through independent distribution. Submit a request for quote; availability and current pricing are confirmed at quote time."},{"question":"What are the key ratings of the 5SM3446-8LA?","answer":"4-pole, Type A selective RCCB rated 63 A at 400 V AC, 100 mA residual trip, 10 kA SCCR, with thermal overload protection. Terminals accept 1.5–25 mm² solid or stranded."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3446-8LA","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/5SM3446-8LA 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}}