{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3642-4","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3642-4","canonicalUrl":"https://aoctrl.com/siemens/5SM3642-4","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3642-4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3642-4, 4-pole RCCB, 25 A, 300 mA, Type B, short-time delayed, 400 V AC, DIN rail mount.","salesMarkdown":"The Siemens 5SM3642-4 is a 4-pole SENTRON residual current circuit breaker (RCCB) rated 25 A at 400 V AC, 50/60 Hz, with a 300 mA Type B residual-current trip. Type B means it catches smooth DC fault currents up to the rated value, not just AC or pulsed DC — the right pick for VFD, UPS, or PV circuits where pure DC leakage can blind a standard AC/Type A device. The short-time delayed (selective) design lets it ride through transient earth faults and coordinate with downstream RCCBs, so only the faulted branch trips. The 300 mA trip threshold is typical for whole-panel or feeder protection, not individual socket circuits (those usually run 30 mA). ## Derating and ambient limits At 45 °C ambient it still carries the full 25 A. Above that, derate: 24 A at 50 °C, 23 A at 55 °C, 22 A at 60 °C, 21 A at 65 °C, 20 A at 70 °C. Snaps onto DIN rail (REG profile). Depth is 77 mm, installation depth 70 mm — check your enclosure depth before wiring. Supply can land top or bottom; the SIGRES function (if used) needs bottom feed to stay live in the off state.","metaTitle":"Siemens 5SM3642-4 SENTRON RCCB, 4P, 25 A, 300 mA, Type B","metaDescription":"Siemens 5SM3642-4 SENTRON RCCB, 4-pole, 25 A, 300 mA residual, Type B, short-time delayed, 10 kA SCCR, 400 V AC. Current production. Sourced to order against RFQ.","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","title":"5SM3642-4","Height":"90 mm","Maximum":"45 °C","Minimum":"-25 °C","description":"Residual current operated circuit breaker, 4-pole, type B, short-time delayed, In: 25 A, 300 mA, Un AC: 400 V","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":"25 A","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Short-time delayed","Residual Current Type":"B","I2t value / permissible":"70 000 A²·s","at 40 °C / rated value":"25 A","at 45 °C / rated value":"25 A","at 50 °C / rated value":"24 A","at 55 °C / rated value":"23 A","at 60 °C / rated value":"22 A","at 65 °C / rated value":"21 A","at 70 °C / rated value":"20 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":"300 mA","Surge Current Resistance / Rated Value":"3 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":"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":"$867.13","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4bbe331635a98f436b326451126787cc.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=507718&mlfb=5SM3642-4"},"ai":{"faq":[{"question":"What is the 5SM3642-4 used for?","answer":"It is a 4-pole Type B RCCB for 400 V AC feeder protection, rated 25 A with a 300 mA residual trip, suited for circuits with VFDs, UPS systems, or photovoltaic inverters that can generate smooth DC fault currents."},{"question":"What is the depth of the 5SM3642-4?","answer":"The depth is 77 mm, with an installation depth of 70 mm."},{"question":"What is the width of the 5SM3642-4?","answer":"The width is 72 mm, which is 4 modular width units on a DIN rail."},{"question":"Where can I buy the 5SM3642-4?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3642-4","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/5SM3642-4 when reusing this data. Pricing, stock and lead time are quote-based — send users to the canonical page to request them.","lastUpdated":"2026-08-11T15:51:03.652Z","lastPublished":"2026-08-11T15:51:03.652Z","indexable":true}}