{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3646-6KK12","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3646-6KK12","canonicalUrl":"https://aoctrl.com/siemens/5SM3646-6KK12","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3646-6KK12","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, Type A, 63 A at 400 V AC, 10 kA short-circuit current rating, DIN rail mount.","salesMarkdown":"The Siemens SENTRON 5SM3646-6KK12 is a 4-pole residual current circuit breaker (RCCB) rated for 63 A at 400 V AC, 50 Hz. Rated short-circuit current withstand is 10 kA, surge current resistance is 1 kA. I²t let-through is 70,000 A²s. ## Temperature derating — the real-world current This RCCB carries its full 63 A rating up to 45 °C ambient. Above that, it derates linearly: 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 your panel sits near a hot motor starter or a sunny wall, that 63 A nameplate won't hold — size the feeder accordingly. Snaps onto standard DIN rail (REG profile). Occupies 4 width units (72 mm wide), 90 mm tall, 77 mm deep — installation depth is 70 mm. Mount in any position; supply connects to the bottom terminals.","metaTitle":"Siemens SENTRON 5SM3646-6KK12 RCCB, 63 A, 4-Pole, Type A, 40","metaDescription":"Siemens SENTRON 5SM3646-6KK12 RCCB, 63 A rated, 4-pole, Type A fault current, 400 V AC, 10 kA SCCR. DIN rail mount, current production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"77 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":"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)","During Storage":"-40 ... +75 °C","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product variations":"SIGRES (harsh ambient conditions)","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":"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","Position / of power supply cord":"bottom","Protection against electrical shock":"Finger and back-of-hand safe","Supply voltage / at AC / rated value":"400 V","Surge current resistance / rated value":"1 kA","Switching function / short-term delayed":"No","Tripping residual current / rated value":"300 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":"100 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=344627&mlfb=5SM3646-6KK12","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3646-6KK12/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SM3646-6KK12's depth?","answer":"The overall depth is 77 mm, with an installation depth of 70 mm."},{"question":"What wire sizes does the 5SM3646-6KK12 accept?","answer":"It accepts solid or stranded copper conductors from 1.5 mm² up to 25 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3646-6KK12","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/5SM3646-6KK12 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}}