{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3644-6KK01","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3644-6KK01","canonicalUrl":"https://aoctrl.com/siemens/5SM3644-6KK01","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3644-6KK01","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3644-6KK01 RCCB, 4-pole, type A, short-time delayed, In 40 A, IΔn 300 mA, Un 400 V AC, DIN rail mount.","salesMarkdown":"Siemens SENTRON 5SM3644-6KK01 is a 4-pole residual current operated circuit breaker (RCCB), type A, short-time delayed, rated 40 A at 400 V AC with a 300 mA trip threshold. The short-time delay means it withstands surge currents up to 3 kA without nuisance tripping — useful on lines with motor starts or capacitor banks that produce brief leakage pulses. Type A detection catches pulsating DC fault currents on top of sinusoidal AC — the standard for circuits with single-phase rectifiers, switched-mode supplies, or variable-speed drives. The 300 mA trip threshold is a fire-protection level, not personnel protection (30 mA is the touch-safe boundary); this RCCB goes upstream of sub-distribution boards or feeds circuits where equipment leakage is expected but ground-fault energy must still be limited. The 40 A continuous rating and 400 V AC system voltage match a three-phase 4-wire (TN or TT) supply feeding a moderate load centre. Short-time delayed design (3 kA surge withstand) lets it ride through transient earth faults caused by switching surges, so it won't drop a feeder on a momentary event. Terminals accept 1.5 to 25 mm² solid or stranded copper, tightened to 2.5–3 N·m. That covers standard panel wiring from a 4 mm² sub-feed up to a 16 mm² main tail. Overall dimensions are 72 mm wide × 90 mm high × 77 mm deep, with 70 mm installation depth into the enclosure. Four width units (4 × 18 mm) on a DIN rail — plan for that slot count in your panel layout. This RCCB is a DIN-rail device for distribution boards (IP20 with conductors connected and the board installed). It sits in a sub-distribution panel feeding general-purpose sockets, lighting circuits, or small machinery where the supply is 400 V three-phase and the design calls for a 300 mA delayed RCCB for fire protection. The SENTRON family is Siemens' standard modular protection range; the 5SM3 design is the short-time delayed variant. Mounting position is any, and supply can enter top or bottom — no orientation restrictions.","metaTitle":"Siemens 5SM3644-6KK01 SENTRON RCCB, 4-pole, 40 A, 300 mA, 40","metaDescription":"Siemens SENTRON 5SM3644-6KK01 RCCB, 4-pole type A, short-time delayed, 40 A rated, 300 mA trip, 400 V AC. 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","Solid":"1.5 ... 25 mm²","Width":"72 mm","Height":"90 mm","Stranded":"1.5 ... 25 mm²","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":"50Hz","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":"A","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SM3","Current / at AC / rated value":"40 A","Product feature / silicon-free":"Yes","Position / of power supply cord":"top or bottom","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":"100 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=491688&mlfb=5SM3644-6KK01","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3644-6KK01/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SM3644-6KK01 and get a price?","answer":"This RCCB is sourced to order through independent distribution. Submit an RFQ for current pricing and availability — confirmed at quote time."},{"question":"What is the closest functional alternative to 5SM3644-6KK01?","answer":"A 5SY4304-7CV is a 3-pole MCB (not an RCCB) with a different function — it protects against overcurrent and short-circuit, not earth leakage. They are not drop-in substitutes. The 5SM3644-6KK01 is the correct 4-pole type A RCCB for this specification; there is no direct functional second-source within the same SENTRON family."},{"question":"What compliance documentation does Siemens provide for 5SM3644-6KK01?","answer":"Siemens provides standard documentation including a CE declaration of conformity and product information for the SENTRON range. Specific certificates (UL, CSA, RoHS, REACH) should be confirmed at order time against the exact variant and shipment destination."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3644-6KK01","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/5SM3644-6KK01 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}}