{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6125-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6125-7","canonicalUrl":"https://aoctrl.com/siemens/5SJ6125-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6125-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6 series, miniature circuit breaker, 1-pole, C-curve, 25 A rated current, 6 kA breaking capacity, 240 V AC, 1 width unit.","salesMarkdown":"The Siemens SENTRON 5SJ6125-7 is a 1-pole miniature circuit breaker (MCB) from the 5SJ6 series, rated at 25 A with a C tripping characteristic. It breaks fault currents up to 6 kA per EN 60898 and IEC 60947-2, which is the standard interrupting rating for commercial and light industrial distribution boards — adequate for most sub-distribution panels where the upstream transformer impedance keeps prospective fault current below that level. The 25 A rating at 240 V AC covers a single-phase branch circuit; the 6 kA breaking capacity means it can safely clear a short-circuit fault up to that level without welding contacts or venting arc gas into the enclosure. The 1-pole, 1-width-unit form factor snaps onto a standard DIN rail and occupies 18 mm of panel width — leaves room for adjacent breakers in a multi-pole assembly. Conductor termination accepts solid or stranded copper from 0.75 to 25 mm², which covers most branch-circuit wire sizes from 18 AWG up to 4 AWG. The IP20 rating is standard for enclosed panel-mount devices — touch-safe only when conductors are connected; not rated for wet or outdoor locations without an additional enclosure. ## Deployment context Installation depth is 70 mm, which fits typical 100 mm deep enclosures with clearance for wiring.","metaTitle":"Siemens SENTRON 5SJ6125-7 MCB, 1P C 25A 6kA","metaDescription":"Siemens SENTRON 5SJ6125-7 miniature circuit breaker, 1-pole C-curve 25 A, 6 kA breaking capacity per EN 60898/IEC 60947-2. Active production. Available to order. Request a quote.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Solid":"0.75 ... 25 mm²","Sealable":"Yes","Stranded":"0.75 ... 25 mm²","Rated Value":"50 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","During Storage":"-40 ... +75 °C","Number of poles":"1","Type of voltage":"AC/DC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-20 ... +45 °C","Product designation":"Miniature circuit breakers","Protection class IP":"IP20, with connected conductors","Overvoltage category":"3","Design of the product":"Miniature circuit breaker 5SJ6","Energy limiting class":"3","Number of width units":"1","Number of poles / Note":"1","circuit-breaker / Design":"5SJ6","Current / at AC / rated value":"25 A","Tripping characteristic class":"C","at DC / rated value / maximum":"60 V","acc. to EN 60898 / rated value":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"6 kA","Product feature / Touch protection":"Yes","Supply voltage / at AC / rated value":"240 V","Influence of the surrounding temperature":"Periodically +55°C, max. 95% humidity","Insulation voltage / at AC / rated value":"440 V","Vibration resistance / acc. to IEC 60068-2-6":"50m/s² at 25 to 150Hz and 60m/s² at 10 to 150 Hz","with multi-phase operation / at AC / maximum":"440 V","Mechanical service life (switching cycles) / typical":"20 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$45.71","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=239256&mlfb=5SJ6125-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ6125-7/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SJ6125-7 and how do I get a price?","answer":"The 5SJ6125-7 is available through independent distribution; submit an RFQ for current pricing and availability — confirmed at quote time."},{"question":"What is the breaking capacity of 5SJ6125-7?","answer":"6 kA per EN 60898 and IEC 60947-2, suitable for most commercial sub-distribution panels."},{"question":"What conductor sizes does 5SJ6125-7 accept?","answer":"Solid or stranded copper from 0.75 to 25 mm², covering 18 AWG to 4 AWG."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6125-7","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/5SJ6125-7 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}}