{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SM2845-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SM2845-8","canonicalUrl":"https://aoctrl.com/siemens/5SM2845-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SM2845-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SM2845-8, 4-pole residual current circuit breaker (RCCB), Type A, selective, In 63 A, IΔn 1000 mA, Un AC 400 V.","salesMarkdown":"It is rated at 63 A continuous current with a 1000 mA tripping fault current — meaning it protects against sinusoidal AC residual currents and pulsating DC residual currents up to 1000 mA, with a deliberate delay to coordinate with downstream RCCBs and avoid nuisance tripping on transient earth faults. The selective characteristic (short-time delayed) makes this the right choice for the upstream position in a distribution board where you need discrimination with downstream 30 mA or 300 mA devices. The 63 A rating at AC is the headline number, but the real-world current capacity drops with ambient temperature: at 40 °C it carries 58.6 A, at 45 °C it carries 58.59 A, and at 70 °C it derates to 50.4 A. The 1000 mA tripping threshold is high enough to avoid nuisance trips on leakage from VFDs or UPS filters, but still provides personnel protection for the distribution feeder — this is not a 30 mA final-circuit device. Overvoltage category III means it is rated for fixed-installation distribution boards, not for downstream equipment. Snap-on mounting to DIN rail (REG fastening method), installable in any position. The 4-pole unit occupies 3 modular width units (each 18 mm, so 54 mm total width on the rail). Depth is 77 mm, installation depth 70 mm — verify clearance to the enclosure door or cover. The RC unit is designed for the 5SY series of MCBs, so it clips directly to the 5SY busbar system for a compact feeder assembly.","metaTitle":"Siemens 5SM2845-8 SENTRON RCCB, 4P, 63 A, 1000 mA, Type A","metaDescription":"Siemens 5SM2845-8 SENTRON residual current circuit breaker, 4-pole, 63 A rated current, 1000 mA tripping, Type A, selective. Active production, available to order.","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":"5SM2845-8","Height":"90 mm","Maximum":"45 °C","Minimum":"-25 °C","description":"RC unit for 5SY, 4-pole, type A, selective, In: 63 A, 1000 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","Maximum Permissible":"75 °C","Minimum Permissible":"-40 °C","at AC / rated value":"63 A","Overvoltage Category":"III","Residual Current Type":"A","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","Number Of Modular Width Units":"3","For Testing Equipment / Minimum":"195 V","Tripping Fault Current / Rated Value":"1 000 mA","Surge Current Resistance / Rated Value":"5 kA","size of installation devices / acc. to DIN 43880":"1","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$86.36","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/9aed9d92e69dceb14e2645bc424f4809.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=142851&mlfb=5SM2845-8"},"ai":{"faq":[{"question":"Where can I buy the 5SM2845-8?","answer":"The 5SM2845-8 is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the depth of the 5SM2845-8?","answer":"The depth is 77 mm, with an installation depth of 70 mm. The width is 124 mm (3 modular units at 18 mm each plus the RCCB housing), and the height is 90 mm."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SM2845-8","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/5SM2845-8 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}}