{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3644-4","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3644-4","canonicalUrl":"https://aoctrl.com/siemens/5SM3644-4","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3644-4","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3644-4 RCCB, 4-pole, type B, short-time delayed, In: 40 A, IΔn: 300 mA, Un AC: 400 V, 10 kA SCCR, DIN rail mount.","salesMarkdown":"The short-time delay means it tolerates brief inrush or transient leakage without tripping — useful on circuits with connected electronics or motor drives that produce a short-duration ground-leakage pulse. Type B detection covers AC, pulsating DC, and smooth DC fault currents up to 1 kHz, so it is the right choice for variable-frequency drive outputs, UPS systems, and PV installations where pure AC-sensing RCCBs would be blind to DC fault components. The 0.8 kA rated conditional short-circuit current per EN 60898 and IEC 61008-1 applies when the RCCB is backed by an upstream overcurrent device; that coordination figure is what you use for selectivity studies. The 4-pole design (3 phases + neutral) handles three-phase loads with a monitored neutral, typical for 400 V distribution in European-style panels. It can be installed in any position, which simplifies layout in crowded enclosures. The device is silicon-free, which matters for applications like automotive paint lines or semiconductor fabs where silicone outgassing can cause adhesion or contamination issues. Snap-on DIN rail mounting (REG profile).","metaTitle":"Siemens 5SM3644-4 SENTRON RCCB, 4-Pole, 40 A, 300 mA, Type B","metaDescription":"Siemens 5SM3644-4 SENTRON RCCB, 4-pole, type B, short-time delayed, 40 A, 300 mA, 400 V AC. 10 kA SCCR. DIN rail mount. Active 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","title":"5SM3644-4","Height":"90 mm","Maximum":"45 °C","Minimum":"-25 °C","description":"Residual current operated circuit breaker, 4-pole, type B, short-time delayed, In: 40 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","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":"400 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":"1.1 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$1,295.40","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/a3b62b959ccee28d6925bd09e456dcc8.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=6391&mlfb=5SM3644-4"},"ai":{"faq":[{"question":"What is the 5SM3644-4 used for?","answer":"It is a 4-pole type B RCCB used for residual current protection on 400 V AC three-phase circuits, particularly where VFDs, UPS systems, or PV inverters may produce DC fault currents that standard AC RCCBs cannot detect. The short-time delay prevents nuisance tripping from transient leakage."},{"question":"Where can I buy the 5SM3644-4?","answer":"The 5SM3644-4 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/5SM3644-4","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/5SM3644-4 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}}