{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3326-4KK14","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3326-4KK14","canonicalUrl":"https://aoctrl.com/siemens/5SM3326-4KK14","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3326-4KK14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 2-pole, 63 A at 40°C, B+ fault current type, short-time delayed, 10 kA SCCR, 230 V AC, DIN rail mount, IP20.","salesMarkdown":"The Siemens 5SM3326-4KK14 is a 2-pole residual current circuit breaker (RCCB) from the SENTRON 5SM3 series, rated 63 A at 40 °C and 230 V AC. It's a short-time delayed design (type B+), meaning it handles smooth DC fault currents and high-frequency AC residuals that a standard AC type would miss — think variable-speed drives, UPS systems, or PV inverters dumping DC onto the line. Mounts on DIN rail, takes up 4 width units (72 mm wide), and accepts solid or stranded conductors from 1.5 up to 25 mm². ## Thermal derating — the real-world current rating The 63 A rating holds at 40 °C and even at 45 °C, but above that you lose headroom fast: 59.2 A at 50 °C, 55.4 A at 55 °C, 51.7 A at 60 °C, 47.8 A at 65 °C, and 44 A at 70 °C. ## B+ fault current type — what it catches Type B+ RCCBs detect smooth DC fault currents plus AC and pulsating DC residuals. The short-time delayed characteristic prevents nuisance tripping from transient surges. The I²t withstand is 70,000 A²s. ## Mounting and wiring in the panel Snaps onto standard DIN rail (mounting type REG). Any mounting position works. The supply can come from top or bottom; for the SIGRES function, the bottom connection stays live even when switched off. The IP20 rating applies once the distribution board is installed with conductors connected — it's not sealed for wet environments. Finger and back-of-hand safe terminals reduce the chance of accidental contact during wiring.","metaTitle":"Siemens 5SM3326-4KK14 SENTRON RCCB, 63 A, 2-pole, B+ type","metaDescription":"Siemens 5SM3326-4KK14 SENTRON RCCB, 63 A rated at 40°C, 2-pole, B+ fault current type, 10 kA SCCR, short-time delayed, DIN rail mount. Current lifecycle product. Sourced to order a","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"70 mm","Solid":"1.5 ... 25 mm²","Width":"72 mm","Height":"90 mm","Stranded":"1.5 ... 25 mm²","at 40 Cel":"63 A","at 45 Cel":"63 A","at 50 Cel":"59.2 A","at 55 Cel":"55.4 A","at 60 Cel":"51.7 A","at 65 Cel":"47.8 A","at 70 Cel":"44 A","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","During Storage":"-40 ... +75 °C","Number of poles":"2","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +45 °C","Operating frequency":"50/60Hz","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":"B+","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":"63 A","Product feature / silicon-free":"Yes","Position / of power supply cord":"Top or bottom (bottom for SIGRES function also in switched-off state)","Protection against electrical shock":"Finger and back-of-hand safe","Supply voltage / at AC / rated value":"230 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=310840&mlfb=5SM3326-4KK14","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3326-4KK14/alternatives.json"},"ai":{"faq":[{"question":"What is 5SM3326-4KK14's listed depth?","answer":"The depth is 70 mm, with an installation depth of 70 mm. Width is 72 mm (4 width units), height is 90 mm."},{"question":"What wire sizes does 5SM3326-4KK14 accept?","answer":"Solid conductors from 1.5 to 25 mm² and stranded conductors from 1.5 to 25 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3326-4KK14","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/5SM3326-4KK14 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}}