{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3346-6KK12","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3346-6KK12","canonicalUrl":"https://aoctrl.com/siemens/5SM3346-6KK12","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3346-6KK12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, 63 A rated at 400 V AC, Type A fault current detection, instantaneous trip, 10 kA short-circuit current rating, DIN rail mount, IP20.","salesMarkdown":"The Siemens SENTRON 5SM3346-6KK12 is a 4-pole residual current circuit breaker (RCCB) rated 63 A at 400 V AC — the current-carrying capacity for a 4-wire (3L+N) supply in a standard 50 Hz distribution board. The instantaneous design (no intentional delay) trips within milliseconds of a fault, so it protects personnel but requires selectivity coordination with downstream MCBs to avoid nuisance tripping on branch faults. ## Temperature derating — the real-world current limit Above that, the continuous current must be reduced: 60.48 A at 50 °C, 57.96 A at 55 °C, 55.44 A at 60 °C, 52.92 A at 65 °C, and 50.4 A at 70 °C. If the panel internal temperature runs hot — common in sealed enclosures or near transformers — the effective capacity drops by roughly 20 % at the top end. The I²t value of 70 000 A²·s gives the energy let-through for coordination studies with upstream breakers. Snap-on DIN rail (REG) mounting, 4 width units (72 mm wide), 77 mm depth, 90 mm height. Installation depth is 70 mm. The bottom-entry power supply cord is standard for RCCBs in this form factor. IP20 with the distribution board installed and conductors connected; finger and back-of-hand safe protection against electrical shock. Silicon-free construction suits applications where outgassing must be avoided, such as in clean rooms or sealed electronics enclosures.","metaTitle":"Siemens SENTRON 5SM3346-6KK12 RCCB, 4P, 63 A, 400 V, Type A","metaDescription":"Siemens SENTRON 5SM3346-6KK12 4-pole RCCB, 63 A at 400 V AC, Type A, 10 kA SCCR, IP20. Current 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":"63 A","at 45 Cel":"63 A","at 50 Cel":"60.48 A","at 55 Cel":"57.96 A","at 60 Cel":"55.44 A","at 65 Cel":"52.92 A","at 70 Cel":"50.4 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","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","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","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=509061&mlfb=5SM3346-6KK12","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3346-6KK12/alternatives.json"},"ai":{"faq":[{"question":"What is the difference between 5SM3346-6KK12 and 5SY4310-7CV?","answer":"The 5SY4310-7CV is a miniature circuit breaker (MCB), not an RCCB — it provides overcurrent and short-circuit protection only, without residual current detection. The 5SM3346-6KK12 detects earth leakage currents (Type A) and trips on ground faults. They serve complementary roles in a distribution board: the MCB protects the branch circuit, the RCCB protects personnel against earth faults. They are not drop-in substitutes."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3346-6KK12","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/5SM3346-6KK12 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}}