{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6125-7RC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6125-7RC","canonicalUrl":"https://aoctrl.com/siemens/5SJ6125-7RC","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6125-7RC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6125-7RC, 1-pole miniature circuit breaker, 25 A rated current, C tripping characteristic, 6 kA breaking capacity per EN 60898, 240 V AC, 18 mm width.","salesMarkdown":"The Siemens 5SJ6125-7RC is a 1-pole SENTRON miniature circuit breaker (MCB) rated 25 A at 240 V AC with a C tripping characteristic and a 6 kA breaking capacity per EN 60898. ## Where it fits — panel and environment The 18 mm width (1 MW) means it takes up the same slot as any single-pole MCB — no extra space needed. IP20 with connected conductors, so it belongs inside a closed panel or distribution board, not in a wet or dusty location. The closest functional peer is the 5SY4125-7CV, also a 1-pole 25 A C-curve MCB in the same 18 mm footprint. The 5SY is built to IEC/EN 60947-2 and carries a 15 kA breaking capacity — more than double the 5SJ's 6 kA (EN 60898). The 5SY also has a higher pollution degree (3 vs 2) and is rated for mechanical engineering/industry environments, while the 5SJ is tagged for retail-line use. If your panel requires a higher fault-current rating or a more robust industrial spec, the 5SY4125-7CV is the direct upgrade. For standard residential or light commercial distribution where 6 kA is sufficient, the 5SJ6125-7RC is the correct fit. Halogen-free and silicon-free construction, sealable for tamper-proofing. Mechanical service life of 10,000 switching cycles typical.","metaTitle":"Siemens 5SJ6125-7RC SENTRON MCB, 1P, 25A, C Curve, 6kA","metaDescription":"Siemens 5SJ6125-7RC SENTRON miniature circuit breaker, 1-pole, 25 A, C characteristic, 6 kA per EN 60898, 240 V AC. Current lifecycle stage. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"18 mm","title":"5SJ6125-7RC","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"MCB Retail line 1p 6kA 25A C Characteristic","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"1P","Number Of Poles":"1","lifecycle_stage":"current","Mounting Position":"any","at AC rated value":"25 A","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"2","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","at 30 °C rated value":"25 A","Energy Limitation Class":"No","according to EN 61346-2":"F","according to IEC 81346-2":"F","Suitability For Operation":"retail line","at DC rated value maximum":"72 V","Number Of Modular Width Units":"1","Tripping Characteristic Class":"C","supply voltage at AC rated value":"240 V","according to EN 60898 rated value":"6 kA","Type Of Voltage Of The Operating Voltage":"AC","with multi-phase operation at AC maximum":"440 V","Value Range Of The Supply Voltage Frequency":"50/60 Hz","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"250 V","Mechanical Service Life (Switching Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/d13456273a627b5a505f0191dd087d36.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=1423729&mlfb=5SJ6125-7RC"},"ai":{"faq":[{"question":"Where can I buy the 5SJ6125-7RC?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is the closest functional second-source — the 5SY4125-7CV?","answer":"Yes, the 5SY4125-7CV is the closest peer. It shares the same 1-pole, 25 A, C-curve, 18 mm footprint but offers a 15 kA breaking capacity (IEC 60947-2) versus the 5SJ's 6 kA (EN 60898), and is rated for industrial environments instead of retail-line use."},{"question":"What is the 5SJ6125-7RC's depth?","answer":"The depth is 76 mm, with an installation depth of 70 mm."},{"question":"What is the 5SJ6125-7RC's width?","answer":"The width is 18 mm, which is one modular unit on a DIN rail."},{"question":"Will the 5SJ6125-7RC drop into a panel specified around the 5SY4125-7CV without rewiring?","answer":"Yes — both parts share the same 18 mm width, 76 mm depth, 90 mm height, and DIN-rail mounting. The 5SJ6125-7RC is a mechanical and dimensional drop-in replacement for the 5SY4125-7CV. The key difference is the lower breaking capacity (6 kA vs 15 kA) and the retail-line environmental rating, so verify the fault-current requirement of your panel before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6125-7RC","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/5SJ6125-7RC 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}}