{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3344-6KK12","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3344-6KK12","canonicalUrl":"https://aoctrl.com/siemens/5SM3344-6KK12","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3344-6KK12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, Type A, 40 A rated at 400 V AC, 10 kA short-circuit current rating, instantaneous design, DIN-rail mount.","salesMarkdown":"The Siemens 5SM3344-6KK12 is a SENTRON 5SM3-series residual current circuit breaker (RCCB) — a 4-pole, Type A device rated 40 A at 400 V AC. Type A means it detects sinusoidal AC fault currents plus pulsating DC fault currents up to 1 kHz, which covers most modern electronic loads (VFDs, switched-mode supplies, lighting ballasts) that a plain AC-sensitive RCCB would miss. The instantaneous design (no intentional time delay) trips as soon as the residual current exceeds the threshold, so it goes upstream of the load, not downstream of a selective main. Above that, the curve steps down: 38.4 A at 50 °C, 36.8 A at 55 °C, 35.2 A at 60 °C, 33.6 A at 65 °C, and 32 A at 70 °C. Mounting is snap-on DIN rail (REG profile), any position. The 4-pole, 4-module width (72 mm) fits a standard 18 mm/module DIN rail footprint. IP20 with conductors connected and distribution board installed — standard for enclosed panels, not for open washdown areas. The 4-module width (72 mm) occupies four 18 mm slots — plan your fill factor accordingly. Supply feeds from the bottom per the manufacturer's position marking. The finger- and back-of-hand-safe terminals (IPXXB/IP2X) meet the protection class for live-part access in a closed panel. Silicon-free construction matters if this goes into a paint shop or coating line where silicone outgassing would cause fisheyes.","metaTitle":"Siemens 5SM3344-6KK12 SENTRON RCCB, 40A 4P Type A, 10kA","metaDescription":"Siemens 5SM3344-6KK12 SENTRON 5SM3 RCCB, 40A rated, 4-pole, Type A, 10kA SCCR, 400V AC. 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":{"Depth":"77 mm","Width":"72 mm","Height":"90 mm","Maximum":"45 °C","Minimum":"-25 °C","at 40 Cel":"40 A","at 45 Cel":"40 A","at 50 Cel":"38.4 A","at 55 Cel":"36.8 A","at 60 Cel":"35.2 A","at 65 Cel":"33.6 A","at 70 Cel":"32 A","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":"SIGRES (harsh ambient conditions)","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":"400 V","Overvoltage category":"III","Design of the product":"Instantaneous","Number of width units":"4","Type of fault current":"A","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","I2t-value / permissible":"70 000 A²·s","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":"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=462538&mlfb=5SM3344-6KK12","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3344-6KK12/alternatives.json"},"ai":{"faq":[{"question":"What is 5SM3344-6KK12's listed depth?","answer":"77 mm overall depth; installation depth behind the panel door is 70 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3344-6KK12","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/5SM3344-6KK12 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}}