{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM2645-0","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM2645-0","canonicalUrl":"https://aoctrl.com/siemens/5SM2645-0","factsUrl":"https://aoctrl.com/api/mcp/products/5SM2645-0","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM2645-0, 4-pole instantaneous RCD, AC type, 63 A rated, 300 mA fault current, 50 Hz, IP20, current production.","salesMarkdown":"It's built to trip on sinusoidal AC fault currents at the 300 mA threshold, making it a fit for general-purpose protection in distribution boards where the load side doesn't generate pulsed DC fault signatures — think resistive heating, basic motor circuits with no VFD, or older lighting banks. Rated at 63 A AC and 460 V insulation voltage, it handles a 50 Hz supply across four poles. ## Thermal derating — what the 63 A rating actually means in a warm panel Above that, the device derates linearly: 58.6 A at 45 °C, 56.7 A at 50 °C, 54.81 A at 55 °C, 53.55 A at 60 °C, 52.29 A at 65 °C, and 50.4 A at 70 °C. The -40 °C to 75 °C storage range is wider than the operating derating curve covers. Snaps onto DIN rail (REG fastening method), occupies 3 modular width units. The IP20 rating applies when installed in a distribution board with conductors connected — so it's a panel-internal device, not for standalone outdoor use.","metaTitle":"Siemens 5SM2645-0 SENTRON RCD, 63A 4P 300mA AC Type","metaDescription":"Siemens 5SM2645-0 SENTRON 4-pole RCD, 63 A rated, 300 mA AC type, instantaneous. Current production. IP20. Available 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":"77 mm","Width":"124 mm","title":"5SM2645-0","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"No","description":"RC unit for 5SY, 4-pole, type AC, In: 63 A, 300 mA, Un AC: 400 V","Design Of Pole":"4 poles","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"REG","Mounting Position":"any","at AC rated value":"63 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Product Variations":"for 5SY","Degree Of Pollution":"2","Product Designation":"RCD-unit","protection class IP":"IP20, if the distribution board is installed, with connected conductors","Overvoltage Category":"III","Design Of The Product":"instantaneous","Residual Current Type":"AC","at 40 °C rated value":"58.6 A","at 45 °C rated value":"58.59 A","at 50 °C rated value":"56.7 A","at 55 °C rated value":"54.81 A","at 60 °C rated value":"53.55 A","at 65 °C rated value":"52.29 A","at 70 °C rated value":"50.4 A","OFF-delay time adjustable":"No","For Testing Equipment Minimum":"195 V","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"top or bottom","Rated Fault Current Adjustable":"No","Protection Function False Tripping":"Yes","Tripping Fault Current Rated Value":"300 mA","insulation voltage (Ui) rated value":"460 V","Surge Voltage Resistance Rated Value":"4 000 V","Value Range Of The Operating Frequency":"50 Hz","reference code according to IEC 81346-2":"F","Type Of Voltage Of The Operating Voltage":"AC","Value Range Of The Supply Voltage Frequency":"50 Hz","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/f8783bc7b52d6b3e09b8926da543239e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=265493&mlfb=5SM2645-0"},"ai":{"faq":[{"question":"Where can I buy 5SM2645-0 and get current pricing?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the latest position."},{"question":"What are the key ratings for 5SM2645-0?","answer":"63 A rated current at 40 °C, 300 mA rated fault current, AC type, instantaneous trip, 4 poles, 460 V insulation voltage, 50 Hz operating frequency. IP20 in an installed distribution board."},{"question":"What is the physical size of 5SM2645-0?","answer":"124 mm wide × 90 mm high × 77 mm deep, installation depth 70 mm. Occupies 3 modular width units on DIN rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM2645-0","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/5SM2645-0 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}}