{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM2646-2","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM2646-2","canonicalUrl":"https://aoctrl.com/siemens/5SM2646-2","factsUrl":"https://aoctrl.com/api/mcp/products/5SM2646-2","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM2646-2, 4-pole RCD unit, type AC selective, rated In 63 A, IΔn 300 mA, Un AC 400 V, 50 Hz, 3 MW, IP20.","salesMarkdown":"The Siemens 5SM2646-2 is a 4-pole residual-current device (RCD) from the SENTRON family, designed as a selective (time-delayed) type AC unit. The selective design means it coordinates with downstream RCDs — it holds during short-duration earth faults, letting the closer device trip first, so only the faulted branch drops out. That makes it the right choice for a distribution board feeding multiple sub-circuits where you want continuity on the main bus. Rated at 63 A and 300 mA sensitivity, this RCD sits at the incoming side of a sub-distribution board or as a main switch RCD in a residential or light commercial panel. The 400 V AC rating covers three-phase 4-wire systems (-L2-L3-N) at line-to-line voltage. Overvoltage category III means it is rated for fixed-installation use downstream of the utility meter, not for plug-in portable gear. The 4 kV surge voltage resistance confirms it withstands typical switching and lightning-induced transients in a building distribution network. The 3 MW modular width (each MW = 18 mm) means it occupies three 18 mm slots on a DIN rail, so 54 mm of rail space. Depth is 70 mm, which is standard for SENTRON RCDs and fits most 125 mm deep enclosures without crowding the gland plate. Fastening method is REG (regular snap-on). Any mounting position is permitted. The unit is not sealable — no provision for a lead seal or lockout hasp. Operating temperature range is -5 °C to 45 °C; storage range is -40 °C to 75 °C, so it handles cold warehouses before installation but needs a heated panel if the ambient drops below -5 °C in service. Pollution degree 2 (non-conductive dust, occasional condensation) covers normal indoor electrical rooms. That matters for thermal management in a densely populated enclosure — ensure free air circulation or derate if adjacent devices are also near their thermal limits.","metaTitle":"Siemens 5SM2646-2 SENTRON RCD Unit, 4-Pole, 63 A, 300 mA, Ty","metaDescription":"Siemens SENTRON 5SM2646-2 RCD unit, 4-pole, type AC selective, rated 63 A / 300 mA at 400 VAC, 50 Hz. Active production. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Residual Current Breakers (RCCB/RCBO)"],"specifications":{"Depth":"70 mm","Width":"123 mm","title":"5SM2646-2","Height":"90 mm","Maximum":"45 °C","Minimum":"-5 °C","Sealable":"No","description":"RC unit for 5SL4, 4-pole, type AC, selective, In: 63 A, 300 mA, Un AC: 400 V","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"REG","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","Product Designation":"RCD-unit","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"Selective","OFF-delay time adjustable":"No","Number Of Modular Width Units":"3","Rated Fault Current Adjustable":"No","Protection Function False Tripping":"Yes","insulation voltage (Ui) rated value":"460 V","Surge Voltage Resistance Rated Value":"4 000 V","Value Range Of The Operating Frequency":"50 Hz","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","for rated value of the current at AC in hot operating state per pole":"3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/2bdf011d8850039939f2cf5b69f298ae.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=111348&mlfb=5SM2646-2"},"ai":{"faq":[{"question":"What are the key ratings of the 5SM2646-2?","answer":"It is a 4-pole, type AC selective RCD rated 63 A continuous current, 300 mA residual fault current, at 400 V AC, 50 Hz. It occupies 3 modular widths (54 mm) on DIN rail with a depth of 70 mm."},{"question":"Where can I buy the 5SM2646-2?","answer":"The 5SM2646-2 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation is available for the 5SM2646-2?","answer":"As a Siemens SENTRON product, it carries CE marking for the European market and is designed to meet relevant IEC/EN standards for RCDs (EN 61008). Specific documentation such as RoHS and REACH declarations are available from Siemens on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM2646-2","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/5SM2646-2 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}}