{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3446-0LB","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3446-0LB","canonicalUrl":"https://aoctrl.com/siemens/5SM3446-0LB","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3446-0LB","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, type AC, In 63 A, IΔn 100 mA, Un AC 400 V, DIN rail mount.","salesMarkdown":"## RCCB for 400 V three-phase panels — 63 A, 100 mA trip, type AC In a panel fed by a transformer with a 10 kA prospective fault level or less, this unit holds its own without needing a backup fuse or upstream MCB to limit the let-through. ## DIN-rail fit and conductor termination The 70 mm installation depth is standard for the SENTRON 5SM3 family, so it aligns with the backplane in a typical distribution board. Terminals accept solid or stranded conductors from 1.5 mm² up to 25 mm² — covers everything from a 2.5 mm² lighting circuit tail up to a 16 mm² or 25 mm² main feeder. Tightening torque is 2.5 to 3 N·m, typical for the screw-type terminals on this class of RCCB. The IP20 rating applies once the distribution board is installed with conductors connected; the device itself is finger and back-of-hand safe per the protection against electrical shock listing. The 10 000 mechanical switching cycles typical is standard for a panel-mounted RCCB — adequate for a distribution board that sees infrequent manual test operations plus occasional fault trips. Silicon-free construction is noted, which matters for potting or conformal-coating processes in certain industrial electronics enclosures.","metaTitle":"Siemens 5SM3446-0LB SENTRON RCCB, 4P, 63A, 100mA, 400V AC","metaDescription":"Siemens 5SM3446-0LB SENTRON RCCB, 4-pole, type AC, 63 A rated current, 100 mA trip sensitivity, 400 V AC. Current 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","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","Ambient temperature":"-5 ... +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":"Instantaneous","Number of width units":"4","Type of fault current":"AC","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":"1 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=184911&mlfb=5SM3446-0LB","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3446-0LB/alternatives.json"},"ai":{"faq":[{"question":"What is the rated residual current and type for 5SM3446-0LB?","answer":"The tripping residual current is 100 mA, and the device is type AC — designed to detect sinusoidal AC residual currents. It is not suitable for pulsed DC or smooth DC fault detection."},{"question":"Where can I buy 5SM3446-0LB and what is the lead time?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm lead time and price."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3446-0LB","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/5SM3446-0LB 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}}