{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3346-4KK14","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3346-4KK14","canonicalUrl":"https://aoctrl.com/siemens/5SM3346-4KK14","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3346-4KK14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON RCCB, 4-pole, 63 A rated, 30 mA trip, Type B+ residual current, short-time delayed, 10 kA SCCR, DIN rail mount.","salesMarkdown":"The Siemens SENTRON 5SM3346-4KK14 is a 4-pole RCCB rated 63 A at 40 °C and 45 °C, with a 30 mA tripping fault current. It is a Type B+ design with short-time delayed switching. The headline 63 A holds at 40 °C and 45 °C ambient. Above that, derate linearly: 59.2 A at 50 °C, 55.4 A at 55 °C, 51.7 A at 60 °C, 47.8 A at 65 °C, 44 A at 70 °C (–). The short-circuit current rating is 10 kA, but note the EN 60898 rating is 0.8 kA — that's the IEC standard for RCCBs, not a contradiction. The 10 kA figure is the conditional rating with an upstream MCB or fuse. The let-through energy is capped at 70,000 A²·s, so coordinate with a breaker that clears within that I²t window. Four modular width units at 72 mm wide. Depth is 77 mm, installation depth 70 mm. ## What the Type B+ rating actually covers Type B+ RCCBs are specified where variable-speed drives, UPS systems, or PV inverters create smooth DC fault currents that a standard Type A or AC device won't see. The 30 mA trip threshold is the standard for personnel protection in most IEC territories. The short-time delay prevents tripping on capacitive inrush from long cable runs or input filters — common in industrial panels with multiple drives.","metaTitle":"SENTRON 5SM3346-4KK14 RCCB, 4P, 63A, 30mA, Type B+, 10kA","metaDescription":"Siemens SENTRON 5SM3346-4KK14 RCCB, 4-pole, 63A rated, 30mA trip, Type B+ residual current, 10kA SCCR. Short-time delayed design. 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","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"DIN rail (REG)","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Product Designation":"RCCB","at AC / rated value":"63 A","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Short-time delayed","Residual Current Type":"B+","I2t value / permissible":"70 000 A²·s","at 40 °C / rated value":"63 A","at 45 °C / rated value":"63 A","at 50 °C / rated value":"59.2 A","at 55 °C / rated value":"55.4 A","at 60 °C / rated value":"51.7 A","at 65 °C / rated value":"47.8 A","at 70 °C / rated value":"44 A","Short-Circuit Current Rating":"10 kA","Number Of Modular Width Units":"4","Product Feature / Silicon-Free":"Yes","acc. to EN 60898 / rated value":"0.8 kA","For Testing Equipment / Minimum":"195 V","Position / Of Power Supply Cord":"Top or bottom (bottom for SIGRES function also in switched-off state)","Let-Through Current / Permissible":"7 500 kA","Tripping Fault Current / Rated Value":"30 mA","Supply Voltage Frequency / Rated Value":"50 Hz","Surge Current Resistance / Rated Value":"3 kA","according to IEC 61008-1 / rated value":"0.8 kA","Switching Function / Short-Term Delayed":"Yes","size of installation devices / acc. to DIN 43880":"1","Mechanical Service Life (Operating 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=286196&mlfb=5SM3346-4KK14","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3346-4KK14/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 5SM3346-4KK14?","answer":"The 5SL4363-7 is a sibling in the same SENTRON family, but it's a different variant — verify the pole count, rated current, and trip characteristic against your BOM before substituting. The 5SM3346-4KK14 is a Type B+, 4-pole, 63 A, 30 mA device; the 5SL series may differ in residual current type or delay profile."},{"question":"Where can I buy 5SM3346-4KK14 and what's the lead time?","answer":"This part is sourced and quoted to order through independent distribution against an RFQ. Availability and current pricing are confirmed at quote time — no stock count or lead-time number is published here, but the supply chain is active for this current-production item."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3346-4KK14","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/5SM3346-4KK14 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}}