{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3344-6LB01","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3344-6LB01","canonicalUrl":"https://aoctrl.com/siemens/5SM3344-6LB01","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3344-6LB01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, type A, short-time delayed, rated 40 A, 30 mA residual, 400 V AC, 10 kA SCCR, DIN rail mount.","salesMarkdown":"The Siemens 5SM3344-6LB01 is a SENTRON residual current operated circuit breaker (RCCB) — 4-pole, type A, short-time delayed, rated 40 A at 400 V AC with a 30 mA trip threshold. Type A means it detects pulsating DC residual currents on top of sinusoidal AC, so it covers rectifier-fed loads like VFDs, switching power supplies, and modern lighting ballasts that a plain AC-type RCCB would miss. The 30 mA trip provides personal protection against direct contact; the 40 A continuous rating matches a typical submain or feeder feeding a mixed load panel. Short-time delayed (selective) design means it withstands brief inrush without tripping, coordinating with downstream MCBs so only the faulted branch opens — not the whole panel. Rated short-circuit withstand is 10 kA, surge current resistance 3 kA, so it holds under fault conditions that would weld contacts on a standard RCCB. ## Panel integration Snaps onto DIN rail (REG mounting), occupies 4 width units (about 72 mm at 18 mm/module). Mounting position any; supply feed top or bottom, no orientation restriction. Terminal torque spec is 2.5 to 3 N·m, accepting solid or stranded copper from 1.5 up to 25 mm² — enough for the 40 A feed without pigtailing down. Finger and back-of-hand safe terminals reduce arc-flash exposure during live troubleshooting.","metaTitle":"Siemens 5SM3344-6LB01 SENTRON RCCB, 4P, 40A, 30mA, Type A","metaDescription":"Siemens SENTRON 5SM3344-6LB01 RCCB, 4-pole, type A, short-time delayed, 40 A, 30 mA, 400 V AC. Active production, available 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":"-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":"30 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":"195 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=191752&mlfb=5SM3344-6LB01","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3344-6LB01/alternatives.json"},"ai":{"faq":[{"question":"What does type A and short-time delayed mean for this RCCB?","answer":"Type A detects both AC sinusoidal and pulsating DC residual currents, covering loads with rectifiers (VFDs, SMPS, LED drivers). Short-time delayed (selective) means it tolerates brief inrush without nuisance tripping, coordinating with downstream MCBs so only the faulted branch opens."},{"question":"What wire sizes does the 5SM3344-6LB01 accept?","answer":"Solid and stranded copper from 1.5 mm² up to 25 mm², terminated under screw terminals torqued to 2.5–3 N·m."},{"question":"Where can I buy the 5SM3344-6LB01?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time — no stock count or price published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3344-6LB01","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/5SM3344-6LB01 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}}