{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3646-5KK14","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3646-5KK14","canonicalUrl":"https://aoctrl.com/siemens/5SM3646-5KK14","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3646-5KK14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON series, selective RCCB, 4-pole, 63 A at 40 °C, 300 mA residual, Type B+, 10 kA SCCR, DIN rail mount.","salesMarkdown":"The Siemens SENTRON 5SM3646-5KK14 is a 4-pole selective residual current circuit breaker (RCCB) rated for 63 A at 40 °C with a 300 mA residual trip threshold. The Type B+ characteristic means it detects AC, pulsating DC, smooth DC, and high-frequency residual currents — covering VFD-fed loads, UPS systems, and EV charging circuits where standard Type A or AC devices would be blind to DC fault components. The selective (time-delayed) design coordinates with downstream 30 mA RCCBs so that only the faulted branch trips, keeping the rest of the distribution board live. Rated short-circuit current withstand is 10 kA, with an additional rating of 0.8 kA per EN 60898 and IEC 61008-1. ## Integration notes Panel integration is straightforward: the 77 mm depth and 72 mm width fit standard DIN-rail enclosures with 4 module spaces. Installation depth of 70 mm leaves clearance for wiring behind the rail. The device is silicon-free — relevant for potting or conformal-coating processes in vibration-prone or humid environments. The temperature derating curve is published: full 63 A up to 45 °C, then 60.5 A at 50 °C, 58 A at 55 °C, 55.4 A at 60 °C, 52.9 A at 65 °C, and 50.4 A at 70 °C. The permissible I²t value of 70,000 A²·s and let-through current of 7,500 kA are coordination values for the upstream MCB or fuse — keep those figures handy for the selective coordination study.","metaTitle":"Siemens SENTRON 5SM3646-5KK14 RCCB, 4P, 63 A, 300 mA, Type B","metaDescription":"Siemens SENTRON 5SM3646-5KK14 selective RCCB, 4-pole, 63 A rated, 300 mA residual, Type B+, 10 kA SCCR. 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","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":"60.5 A","at 55 °C / rated value":"58 A","at 60 °C / rated value":"55.4 A","at 65 °C / rated value":"52.9 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 (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=131109&mlfb=5SM3646-5KK14","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3646-5KK14/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3646-5KK14?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm position."},{"question":"What does Type B+ mean on this RCCB?","answer":"Type B+ detects AC, pulsating DC, smooth DC, and high-frequency residual currents up to 1 kHz. It's specified for applications with VFDs, UPS systems, EV chargers, and other loads that generate DC fault components a standard Type A device would miss."},{"question":"What is the difference between this 5SM3646-5KK14 and a standard 5SL4 series RCCB?","answer":"The 5SM3646-5KK14 is a selective (time-delayed) Type B+ device rated 63 A / 300 mA. A standard 5SL4 RCCB is typically a non-selective Type A or AC device at lower current ratings. The selective design allows this unit to coordinate with downstream 30 mA RCCBs so only the faulted branch trips — a 5SL4 would trip immediately on any residual fault, taking the whole submain down."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3646-5KK14","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/5SM3646-5KK14 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}}