{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3444-0LB01","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3444-0LB01","canonicalUrl":"https://aoctrl.com/siemens/5SM3444-0LB01","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3444-0LB01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, type AC, short-time delayed, In: 40 A, IΔn: 100 mA, Un: 230 V AC, 10 kA SCCR, DIN rail mount, IP20.","salesMarkdown":"The Siemens SENTRON 5SM3444-0LB01 is a 4-pole residual current operated circuit breaker (RCCB), type AC, short-time delayed, rated at 40 A and 100 mA tripping residual current on a 230 V AC supply. It carries a 10 kA short-circuit current rating and mounts on DIN rail (REG) — a standard fit for distribution boards in residential or light commercial panels. The 100 mA residual-current trip threshold is set above the 30 mA level used for personal shock protection — this unit is sized for equipment protection or fire-prevention circuits where nuisance tripping from leakage on long cable runs or VFD filters would otherwise be a problem. The short-time delayed design means it withstands brief surge currents up to 3 kA without tripping, coordinating with downstream MCBs so only the faulted branch clears. The 4-pole construction switches all live conductors including the neutral — required for three-phase circuits where a neutral conductor is present. Designed for DIN-rail (REG) mounting in SENTRON distribution boards. The top-or-bottom feed position simplifies panel wiring. Silicon-free construction suits environments where silicone outgassing can contaminate contacts or optics. Overvoltage category III means it is rated for fixed-installation mains supply — downstream of the service entrance but upstream of socket outlets.","metaTitle":"Siemens SENTRON 5SM3444-0LB01 RCCB, 4-pole, 40 A, 100 mA, 10","metaDescription":"Siemens SENTRON 5SM3444-0LB01 RCCB, 4-pole, type AC, short-time delayed, 40 A, 100 mA, 230 V AC, 10 kA SCCR, DIN rail mount, IP20. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Maximum":"45 °C","Minimum":"-5 °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","Product designation":"RCCB","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","at AC / rated value":"230 V","Overvoltage category":"III","Design of the product":"Short-time delayed","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":"40 A","Product feature / silicon-free":"Yes","For Testing Equipment / Minimum":"100 V","Position / of power supply cord":"top or bottom","Protection against electrical shock":"Finger and back-of-hand safe","Surge current resistance / rated value":"3 kA","Switching function / short-term delayed":"Yes","Tripping residual current / rated value":"100 mA","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=428358&mlfb=5SM3444-0LB01","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3444-0LB01/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3444-0LB01 and how do I get a price?","answer":"The 5SM3444-0LB01 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is 5SM3444-0LB01's listed maximum ambient temperature?","answer":"The maximum ambient operating temperature is 45 °C; storage maximum is 75 °C."},{"question":"What is 5SM3444-0LB01's listed minimum ambient temperature?","answer":"The minimum ambient operating temperature is -5 °C; storage minimum is -40 °C."},{"question":"Will 5SM3444-0LB01 drop into a panel that was specified around 5SQ2670-2YA16 without rewiring?","answer":"No — the 5SQ2670-2YA16 is a 4-pole MCB (16 A, C-curve, 400 V AC, 55 mm depth) while the 5SM3444-0LB01 is a 4-pole RCCB (40 A, 100 mA, 230 V AC, 70 mm depth). They serve different protection functions and have different depth and voltage ratings; direct substitution is not possible without rewiring and re-evaluating the panel coordination."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3444-0LB01","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/5SM3444-0LB01 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}}