{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3646-5","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3646-5","canonicalUrl":"https://aoctrl.com/siemens/5SM3646-5","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3646-5","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3646-5, selective Type B RCCB, 4-pole, 63 A, 300 mA residual current, 10 kA SCCR, DIN rail mount.","salesMarkdown":"The Siemens SENTRON 5SM3646-5 is a selective Type B residual current circuit breaker (RCCB) — 4-pole, rated 63 A at 40 °C, with a 300 mA tripping threshold and a 10 kA short-circuit current rating. The selective design (time-delayed) means it coordinates with downstream RCCBs: on a fault, the downstream device trips first, leaving this one closed to keep upstream circuits live. That's the difference between losing one branch and losing the whole panel. Type B detection handles AC, pulsating DC, smooth DC, and high-frequency residual currents. The 300 mA trip threshold is typical for selective RCCBs in distribution boards feeding sub-distribution or fixed equipment. At 50 °C it drops to 60.48 A, at 60 °C to 55.44 A, and at 70 °C to 50.4 A. The EN 60898 rating is 0.8 kA — that's the lower conditional rating under that standard's test sequence, not the interrupting capacity you design to. Use the 10 kA figure for your SCCR label. ## Panel integration Mounting position is any — no restriction on upright or horizontal. The top or bottom feed option means you can bus it either way; the SIGRES function (selective isolation) stays active even with bottom feed in the off state. Silicon-free construction, which matters if this goes into a paint shop or coating line where silicone outgassing causes fisheyes.","metaTitle":"Siemens 5SM3646-5 SENTRON RCCB, 63A 4P Type B Selective, 300","metaDescription":"Siemens SENTRON 5SM3646-5 selective Type B RCCB, 63 A, 4-pole, 300 mA residual current, 10 kA SCCR. DIN rail mount. Current lifecycle stage. 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","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","Operating Frequency":"50/60 Hz","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":"Selective","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":"60.48 A","at 55 °C / rated value":"57.96 A","at 60 °C / rated value":"55.44 A","at 65 °C / rated value":"52.92 A","at 70 °C / rated value":"50.4 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":"300 mA","Supply Voltage Frequency / Rated Value":"50 Hz","Surge Current Resistance / Rated Value":"5 kA","according to IEC 61008-1 / rated value":"0.8 kA","Switching Function / Short-Term Delayed":"No","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=404685&mlfb=5SM3646-5","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3646-5/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SM3646-5 used for?","answer":"It's a selective (time-delayed) Type B RCCB for distribution boards where you need earth-fault discrimination between the main switch and downstream RCCBs. Typical applications include sub-distribution feeding VFD-driven loads, UPS systems, or medical equipment that generates smooth DC fault currents."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3646-5","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/5SM3646-5 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}}