{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM3647-0KL","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM3647-0KL","canonicalUrl":"https://aoctrl.com/siemens/5SM3647-0KL","factsUrl":"https://aoctrl.com/api/mcp/products/5SM3647-0KL","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM3647-0KL, 4-pole residual current circuit breaker (RCCB), type AC, In 80 A, IΔn 300 mA, Un 400 V AC, N left, DIN rail mount.","salesMarkdown":"## RCCB, 80 A, 300 mA, 4-pole — panel fit and sourcing note The Siemens 5SM3647-0KL is a SENTRON residual current circuit breaker (RCCB), 4-pole, type AC, with an 80 A rated current and a 300 mA residual trip threshold at 400 V AC. The 300 mA trip level is sized for general distribution protection — it catches earth faults without nuisance-tripping on normal leakage from connected equipment. Instantaneous design (no intentional delay) means it trips within the RCCB standard response window — suitable for direct fault isolation, not selectivity grading against downstream RCBOs. The IP20 rating applies once the distribution board cover is installed with conductors connected — it is not a standalone IP20 part. ## Mechanical and compliance details Rated for 10 000 mechanical switching cycles typical, which is the standard endurance for a DIN-rail RCCB in distribution duty — not a high-cycle motor-switching device. Silicon-free construction matters for automotive paint-shop and coating-line installations where silicone outgassing can cause adhesion defects. Finger and back-of-hand safe touch protection means the terminals are designed to prevent accidental contact during wiring — this is a standard requirement for distribution boards accessible to non-skilled personnel. Supply connection can be top or bottom, which simplifies busbar and cable routing in crowded enclosures. ## What the 300 mA trip means in practice A 300 mA RCCB is not a personnel-protection device — that role is served by 30 mA units. The 300 mA threshold is typically used for fire protection and equipment protection in circuits where some continuous leakage is expected (long cable runs, industrial heaters, or IT equipment with filters). It will not trip on the normal capacitive leakage of a well-designed panel, but it will clear a hard phase-to-ground fault before the upstream overcurrent device operates, provided the fault current exceeds 300 mA.","metaTitle":"Siemens 5SM3647-0KL SENTRON RCCB, 80 A 300 mA 4P Type AC","metaDescription":"Siemens SENTRON 5SM3647-0KL residual current circuit breaker, 4-pole, type AC, 80 A rated, 300 mA trip, 400 V AC, DIN rail mount. Current lifecycle stage, available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Maximum":"25 mm²","Minimum":"1.5 mm²","Rated Value":"50 Hz","Mounting type":"DIN rail (REG)","Number of poles":"4","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Product variations":"N left","Operating frequency":"50Hz","Product designation":"RCCB","Protection class IP":"IP20, if the distribution board is installed, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Design of the product":"Instantaneous","Number of width units":"4","Type of fault current":"AC","circuit-breaker / Design":"5SM3","Current / at AC / rated value":"80 A","Product feature / silicon-free":"Yes","For Testing Equipment / Minimum":"100 V","Position / of power supply cord":"top or bottom","Protection against electrical shock":"Finger and back-of-hand safe","Switching function / short-term delayed":"No","Tripping residual current / rated value":"300 mA","Size of installation devices / acc. to DIN 43880":"1","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=143508&mlfb=5SM3647-0KL","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SM3647-0KL/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy the 5SM3647-0KL and what is the lead time?","answer":"The part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — no stock count or lead-time figure is published here."},{"question":"What is the closest functional second-source to the 5SM3647-0KL?","answer":"The 5SQ2670-2YA63 is a 4-pole SENTRON MCB (63 A, C-curve, 3 kA), not an RCCB — it provides overcurrent protection only, not residual current detection. The 5SM3647-0KL cannot be replaced by an MCB alone; a separate RCCB or RCBO would be needed. The 5SL6606-7YA is a 4-pole MCB (6 A, C-curve) and also does not fill the RCCB function."},{"question":"What is the maximum and minimum conductor size for the 5SM3647-0KL?","answer":"The terminals accept 1.5 mm² minimum and 25 mm² maximum solid or stranded copper."},{"question":"Will the 5SM3647-0KL drop into a panel specified around the 5SQ2670-2YA63 without rewiring?","answer":"No — the 5SQ2670-2YA63 is a 4-pole MCB (63 A, C-curve) with a 55 mm installation depth, while the 5SM3647-0KL is a 4-pole RCCB (80 A, 300 mA) with a 70 mm depth. The depth difference of 15 mm may cause interference with the enclosure door or cover. The function is also different: the MCB provides overcurrent protection; the RCCB provides earth leakage protection. A direct swap would leave the circuit without overcurrent protection unless a separate MCB is added."},{"question":"What compliance documentation is available for the 5SM3647-0KL?","answer":"The product is a Siemens SENTRON RCCB designed to IEC/EN 61008 standards for residual current devices. Silicon-free construction is confirmed. For specific RoHS, REACH, or UL documentation, request the manufacturer's declaration of conformity at RFQ time — the evidence does not list individual certification marks."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM3647-0KL","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/5SM3647-0KL 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}}