{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3344-6LA","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3344-6LA","canonicalUrl":"https://aoctrl.com/siemens/5SM3344-6LA","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3344-6LA","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series, RCCB, 4-pole, Type A, In: 40 A, IΔn: 30 mA, Un AC: 400 V, 10 kA, DIN rail mount.","salesMarkdown":"## What this RCCB is and what the ratings mean The Siemens 5SM3344-6LA is a SENTRON residual current circuit breaker (RCCB) — the thing that kills power the instant it senses a ground fault leaking to earth. Four poles, Type A waveform detection, and it carries a 40 A continuous rating at 400 V AC, 50 Hz. The 30 mA trip threshold is the standard for personnel protection (shock hazard), and the 10 kA short-circuit current rating (SCCR) means it can safely interrupt a fault up to that level without welding its contacts shut or blowing apart. That 10 kA number is what the upstream breaker needs to coordinate with — if your available fault current at the panel exceeds 10 kA, this RCCB isn't the right choice without a current-limiting device ahead of it. ## DIN rail fit and panel integration Snaps onto a standard DIN rail (REG profile), takes up 4 width units (about 72 mm), and installs 70 mm deep. Mounting position is any orientation, and the supply can land top or bottom — no forced busbar order. The terminals accept 1.5 mm² minimum up to 25 mm², which covers most panel wiring from control circuits up to the incoming feed for a sub-distribution board. IP20 with the distribution board cover fitted, so it's meant for enclosed panels, not washdown areas. ## Lifecycle and sourcing reality This part is marked as current production — no phase-out notice, no last-time-buy window to chase. It's a standard catalogue item in the SENTRON 5SM3 family. Sourced and quoted to order against an RFQ through independent distribution; availability and current pricing confirmed at quote time. If you're freezing a BOM or filling a line-down gap, this one isn't a scavenger hunt.","metaTitle":"Siemens 5SM3344-6LA SENTRON RCCB, 40A, 30mA, Type A, 4P","metaDescription":"Siemens 5SM3344-6LA SENTRON RCCB, 4-pole, Type A, 40 A rated, 30 mA trip, 400 V AC, 10 kA SCCR. 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":{"Maximum":"25 mm²","Minimum":"1.5 mm²","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","Product variations":"With thermal overload protection","Operating frequency":"50Hz","Product designation":"RCCB","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Design of the product":"Instantaneous","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","For Testing Equipment / Minimum":"195 V","Position / of power supply cord":"top or bottom","Protection against electrical shock":"Finger and back-of-hand safe","Surge current resistance / rated value":"1 kA","Switching function / short-term delayed":"No","Tripping residual current / rated value":"30 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=440246&mlfb=5SM3344-6LA","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3344-6LA/alternatives.json"},"ai":{"faq":[{"question":"What are the key ratings of the 5SM3344-6LA?","answer":"40 A rated current, 30 mA trip residual, 400 V AC, 4-pole, Type A, 10 kA SCCR, 50 Hz, DIN rail mount, terminals accept 1.5 to 25 mm²."},{"question":"Where can I buy the 5SM3344-6LA?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an inquiry for a firm quote."},{"question":"Will the 5SM3344-6LA drop into a panel wired for a 5SQ2670-2YA63?","answer":"Both are 4-pole, 4-width-unit (72 mm) DIN-rail devices at 400 V, so the footprint and busbar spacing match. The 5SQ2670-2YA63 is an MCB (overcurrent-only), while the 5SM3344-6LA is an RCCB (ground-fault plus thermal overload). They serve different protection roles — swapping one for the other changes the protection scheme, but the mechanical fit is the same."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3344-6LA","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/5SM3344-6LA 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}}