{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3746-5","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3746-5","canonicalUrl":"https://aoctrl.com/siemens/5SM3746-5","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3746-5","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON selective RCCB, 4-pole, 63 A, Type B, 500 mA, 10 kA, DIN rail.","salesMarkdown":"The Siemens SENTRON 5SM3746-5 is a 4-pole selective residual current circuit breaker (RCCB) rated 63 A at 400 V AC, 50/60 Hz. The Type B residual-current detection means it trips on AC, pulsating DC, and smooth DC fault currents — the full spectrum you get from variable-speed drives, UPS systems, or photovoltaic inverters. The 500 mA rated tripping fault current is higher than a standard 30 mA RCD, so it's sized for selective coordination: it lets downstream 30 mA devices clear a ground fault first, only tripping this upstream unit if the fault persists or exceeds its threshold. IP20 with conductors connected, so it's intended for enclosed panels only, not washdown or outdoor exposure. ## Thermal derating — the real-world current Above that, it steps down: 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.","metaTitle":"Siemens SENTRON 5SM3746-5 RCCB, 4P, 63 A, Type B, 500 mA","metaDescription":"Siemens SENTRON 5SM3746-5 selective RCCB, 4-pole, 63 A rated, Type B residual current, 500 mA tripping fault current, 10 kA SCCR. DIN rail mount. Available to order; confirm pricin","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":"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","Position / Of Power Supply Cord":"Top or bottom (bottom for SIGRES function also in switched-off state)","Let-Through Current / Permissible":"7 500 A","according to EN 60898 / rated value":"0.8 kA","Tripping Fault Current / Rated Value":"500 mA","Surge Current Resistance / Rated Value":"5 kA","according to IEC 61008-1 / rated value":"0.8 kA","Switching Function / Short-Term Delayed":"No","Value Range / Of The Operating Frequency":"50/60 Hz","value range / of the supply voltage / at AC":"400 V","Value Range / Of The Supply Voltage Frequency":"50 Hz","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=172610&mlfb=5SM3746-5","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3746-5/alternatives.json"},"ai":{"faq":[{"question":"What is the 5SM3746-5 rated current and voltage?","answer":"63 A at 400 V AC, 50/60 Hz, 4-pole. The 63 A holds up to 45 °C ambient; derate above that per the thermal table."},{"question":"What is the difference between the 5SM3746-5 and the 5SL4363-7?","answer":"The 5SL4363-7 is a standard (non-selective) RCCB, while the 5SM3746-5 is selective (time-delayed). The selective version coordinates with downstream 30 mA RCDs so only the faulted branch trips first. Both are 4-pole, 63 A, Type B, but the 5SM3746-5 carries a higher short-circuit rating (10 kA vs 0.8 kA per EN 60898) and a different tripping characteristic. They are not drop-in substitutes without checking the coordination study."},{"question":"Where can I buy the 5SM3746-5 and get a price?","answer":"The part is available to order. Submit an RFQ for current pricing and lead time; availability is confirmed at quote time through independent distribution channels."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3746-5","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/5SM3746-5 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}}