{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3642-4KK14","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3642-4KK14","canonicalUrl":"https://aoctrl.com/siemens/5SM3642-4KK14","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3642-4KK14","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3 series RCCB, 4-pole, Type B+ fault current, 25 A rated at 400 V AC, 10 kA SCCR, short-time delayed, DIN rail mount.","salesMarkdown":"The Siemens 5SM3642-4KK14 is a 4-pole residual current circuit breaker (RCCB) from the SENTRON 5SM3 series, designed for 400 V AC systems at 50/60 Hz. Rated at 25 A continuous with a 10 kA short-circuit current rating (SCCR), it's sized for sub-distribution boards feeding mixed loads. The short-time delayed design (S-type) provides selectivity with downstream RCCBs, so a fault on a branch trips the branch device rather than this main unit — keeps the rest of the board live. The 25 A rating holds at 40 °C and 45 °C; derate to 24 A at 50 °C, 23 A at 55 °C, and 22 A at 60 °C, down to 20 A at 70 °C. If your enclosure runs warm, use the 50 °C column for sizing — a 25 A circuit on a hot panel floor may need the next frame up. That's standard for most commercial sub-distribution; verify against your transformer size and cable length if the available fault current exceeds 10 kA. Type B+ detection covers AC, pulsating DC, and smooth DC fault currents up to the rated residual current. The surge current resistance of 3 kA (8/20 µs waveform) means it won't nuisance-trip on lightning-induced surges common in industrial mains. The I²t rating of 70,000 A²s gives coordination data for upstream MCBs or fuses — useful when building a selective distribution board per IEC 60947-2. Occupies 4 width units (72 mm wide, 90 mm tall, 77 mm deep with 70 mm installation depth). Mounting position is unrestricted — horizontal, vertical, or flat — which helps in tight enclosures.","metaTitle":"Siemens 5SM3642-4KK14 SENTRON RCCB, Type B+, 25 A, 4-Pole, 4","metaDescription":"Siemens SENTRON 5SM3642-4KK14 RCCB, 25 A rated, 4-pole, 400 V AC, Type B+ fault current, 10 kA SCCR, short-time delayed. DIN rail mount. Available to order — request quote.","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":"25 A","at 45 Cel":"25 A","at 50 Cel":"24 A","at 55 Cel":"23 A","at 60 Cel":"22 A","at 65 Cel":"21 A","at 70 Cel":"20 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","Ambient temperature":"-25 ... +45 °C","Operating frequency":"50/60Hz","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","Number of width units":"4","Type of fault current":"B+","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":"25 A","Product feature / silicon-free":"Yes","Position / of power supply cord":"Top or bottom (bottom for SIGRES function also in switched-off state)","Protection against electrical shock":"Finger and back-of-hand safe","Supply voltage / at AC / rated value":"400 V","Surge current resistance / rated value":"3 kA","Switching function / short-term delayed":"Yes","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":"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=181765&mlfb=5SM3642-4KK14","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3642-4KK14/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SM3642-4KK14 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Submit a request for quote (RFQ) to confirm current availability and pricing at the time of order."},{"question":"What is the depth of the 5SM3642-4KK14?","answer":"The listed depth is 77 mm, with an installation depth of 70 mm into the distribution board."},{"question":"What conductor sizes does the 5SM3642-4KK14 accept?","answer":"It accepts solid and stranded conductors from 1.5 mm² up to 25 mm²."},{"question":"Will the 5SM3642-4KK14 drop into a panel specified for the 5SY4304-7CV?","answer":"No — the 5SY4304-7CV is a miniature circuit breaker (MCB), not an RCCB. The 5SM3642-4KK14 is a 4-pole Type B+ RCCB with different function, wiring, and space requirements. They are not direct drop-in substitutes."},{"question":"What compliance documentation does Siemens provide for the 5SM3642-4KK14?","answer":"The part carries overvoltage category III rating per IEC 60947-2 and is designed to DIN EN 61346-2 and DIN EN 81346-2 standards. It is finger and back-of-hand safe (IP20 when installed). For specific RoHS, REACH, or UL documentation, request the manufacturer's declaration through the RFQ process."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3642-4KK14","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/5SM3642-4KK14 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}}