{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3444-6LA01","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3444-6LA01","canonicalUrl":"https://aoctrl.com/siemens/5SM3444-6LA01","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3444-6LA01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series, 4-pole RCCB, type A, short-time delayed, In: 40 A, IΔn: 100 mA, Un: 400 V AC, 10 kA SCCR, DIN rail mount.","salesMarkdown":"The Siemens SENTRON 5SM3444-6LA01 is a 4-pole residual current circuit breaker (RCCB) rated for 40 A at 400 V AC, 50 Hz, with a 100 mA trip threshold and type A fault current sensitivity. The type A designation means it detects both sinusoidal AC residual currents and pulsating DC residual currents — needed on circuits feeding single-phase rectifiers, switching power supplies, or variable-speed drives. The 4-pole construction (switching all three phases plus neutral) suits three-phase four-wire systems, common in European industrial and commercial panels. The 40 A rating and 100 mA trip target sub-distribution boards feeding mixed loads — motor circuits, lighting, socket outlets — where a 30 mA device would nuisance-trip on normal cable leakage. The short-time delay (also called selective or S-type) allows downstream 30 mA RCCBs to clear first, keeping this unit as the backup; that selectivity is what makes it a panel-main or feeder RCCB rather than a final-circuit device. Mounts on DIN rail (REG profile), occupying 4 width units (about 72 mm). Terminals accept solid or stranded conductors from 1.5 mm² up to 25 mm², with a tightening torque of 2.5 to 3 N·m — the 25 mm² upper end is generous for a 40 A device, allowing easy busbar or larger feeder connections. The part includes thermal overload protection (bimetallic strip) — unusual for an RCCB, which typically only detects residual current. This means the 5SM3444-6LA01 also protects against sustained overcurrent, combining RCD and overload functions in one device. That saves a DIN slot versus a separate RCCB + MCB combination, though it does not provide short-circuit protection (the 10 kA SCCR is its withstand, not its interruption capability for overloads — the thermal element handles that). The 5SM3 series is the delayed-trip RCCB line within SENTRON, distinct from the instantaneous 5SM1 series. The 5SM3444-6LA01 sits alongside the 5SY4 series MCBs in the same DIN-rail panel ecosystem — they share the same mounting, terminal range, and width-unit grid, so coordination in a distribution board is straightforward. ## Deployment context — where this RCCB goes This RCCB is designed for DIN-rail distribution boards in commercial buildings, industrial control panels, and infrastructure installations. The IP20 rating (with conductors connected and distribution board installed) means it lives inside a closed enclosure — not exposed to washdown or outdoor conditions. The finger and back-of-hand safe protection (per DIN VDE 0106 part 100) means the terminals are touch-safe when the device is mounted in a distribution board — a safety requirement for panel builders in Europe.","metaTitle":"Siemens SENTRON 5SM3444-6LA01 RCCB, 4-pole, 40 A, 100 mA, 40","metaDescription":"Siemens SENTRON 5SM3444-6LA01 4-pole RCCB, type A, short-time delayed, 40 A rated, 100 mA trip, 400 V AC, 10 kA SCCR, DIN rail mount. Available to order.","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","Product variations":"With thermal overload protection","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":"Short-time delayed","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":"40 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":"3 kA","Switching function / short-term delayed":"Yes","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=272372&mlfb=5SM3444-6LA01","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3444-6LA01/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of the 5SM3444-6LA01?","answer":"40 A rated current, 100 mA residual trip current, 400 V AC rated voltage, 10 kA SCCR, type A fault current detection, short-time delayed, 4-pole, 50 Hz only."},{"question":"What wire sizes does the 5SM3444-6LA01 accept?","answer":"Solid and stranded conductors from 1.5 mm² up to 25 mm², with a tightening torque of 2.5 to 3 N·m."},{"question":"Where can I buy the 5SM3444-6LA01?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels; availability and current pricing are confirmed at quote time."},{"question":"Does the 5SM3444-6LA01 include thermal overload protection?","answer":"Yes, the product variations include thermal overload protection, meaning it combines RCD and overload functions in one device."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3444-6LA01","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/5SM3444-6LA01 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}}