{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3621-4KK14","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3621-4KK14","canonicalUrl":"https://aoctrl.com/siemens/5SM3621-4KK14","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3621-4KK14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3621-4KK14, 2-pole RCCB, type B+, short-time delayed, In 16 A, 300 mA, Un AC 230 V, 10 kA SCCR, 4 MW, DIN rail.","salesMarkdown":"The Siemens SENTRON 5SM3621-4KK14 is a 2-pole residual current operated circuit breaker (RCCB), type B+, rated 16 A with a 300 mA trip sensitivity at 230 V AC. The short-time delayed switching function (selective type) allows coordination with downstream devices, so that only the faulted branch clears on a ground fault — useful for maintaining supply to critical loads in a panel. ## Selectivity and fault coordination The short-time delayed design (type B+, selective) means this RCCB withstands a brief inrush or transient without tripping, giving downstream MCBs or RCCBs time to clear a fault first. Depth is 70 mm, height 90 mm. Mounting position is unrestricted. Listed as current production. No official successor has been issued for this order code. ## Environmental and installation notes Silicon-free construction. Overvoltage category III.","metaTitle":"Siemens 5SM3621-4KK14 SENTRON RCCB, 2P, 16 A, 300 mA, Type B","metaDescription":"Siemens SENTRON 5SM3621-4KK14 RCCB, 2-pole, 16 A, 300 mA, type B+, short-time delayed, 10 kA SCCR, 230 V AC, DIN rail. Sourced to order; confirm current pricing and availability vi","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"70 mm","Width":"72 mm","Height":"90 mm","Maximum":"45 °C","Minimum":"-25 °C","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"DIN rail (REG)","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Product Designation":"RCCB","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Short-time delayed","Product Feature Silicon-Free":"Yes","Short-Circuit Current Rating":"10 kA","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Top or bottom (bottom for SIGRES function also in switched-off state)","according to EN 60898 rated value":"0.8 kA","according to IEC 61008-1 rated value":"0.8 kA","Switching Function Short-Term Delayed":"Yes","Value Range Of The Operating Frequency":"50/60 Hz","value range of the supply voltage at AC":"230 V","Ambient Temperature During Storage Minimum":"-40 °C","Value Range Of The Supply Voltage Frequency":"50 Hz","Supply Voltage For Testing Equipment Minimum":"195 V","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","for rated value of the current at AC in hot operating state per pole":"0.4 W"}},"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=251122&mlfb=5SM3621-4KK14","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3621-4KK14/alternatives.json"},"ai":{"faq":[{"question":"What is the depth and width of 5SM3621-4KK14?","answer":"Depth is 70 mm, width is 72 mm (4 modular units), height is 90 mm."},{"question":"Where can I buy 5SM3621-4KK14?","answer":"This part is sourced and quoted to order against an RFQ. Submit a request for current pricing and availability; the quotation will confirm the supply position at that time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3621-4KK14","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/5SM3621-4KK14 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}}