{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ6125-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ6125-6","canonicalUrl":"https://aoctrl.com/siemens/5SJ6125-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ6125-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ6125-6, 1-pole miniature circuit breaker, B-curve, 25 A rated current, 6 kA breaking capacity per EN 60898 / IEC 60947-2, 240 V AC, 18 mm wide.","salesMarkdown":"The Siemens SENTRON 5SJ6125-6 is a 1-pole miniature circuit breaker rated at 25 A with a B-curve tripping characteristic, designed for 240 V AC circuits and delivering 6 kA breaking capacity per EN 60898 and IEC 60947-2. If your site has transformer-fed sub-distribution with higher fault current, this MCB won't coordinate; you'd step up to a 10 kA or 15 kA rated unit. The 25 A rating at 240 V AC covers common lighting, socket-outlet, and small-appliance circuits on a single phase. At DC, the maximum rated voltage is 60 V — so it works for 48 V telecom or control power supplies but not for a 110 V DC bus. Wire range accepts 0.75 to 25 mm² solid or stranded — covers everything from 1.5 mm² lighting tails up to 6 mm² feeder circuits in a single terminal. The terminals are touch-protected (IP20 with conductors connected), and the unit is sealable for anti-tamper applications. Ambient temperature range is -20 to +45 °C, with periodic excursions to +55 °C and 95% humidity; storage range is -40 to +75 °C. Vibration resistance tested to 50 m/s² at 25-150 Hz and 60 m/s² at 10-150 Hz per IEC 60068-2-6, so it holds up on machine-mounted sub-panels. Overvoltage category 3 means it's rated for fixed-installation distribution boards, not for equipment-level protection. The mechanical service life is 20,000 switching cycles typical — adequate for a distribution MCB that sees infrequent manual operation, not for a switching duty cycle. Compliance documentation includes the usual Siemens declarations: RoHS, REACH, and CE marking per the Low Voltage Directive; UL and CSA listings are not cited on this entry, so verify with the factory if your spec requires them.","metaTitle":"Siemens SENTRON 5SJ6125-6 Miniature Circuit Breaker, 25 A, B","metaDescription":"Siemens SENTRON 5SJ6125-6 miniature circuit breaker, 1-pole, 25 A, B-curve, 6 kA breaking capacity per EN 60898. Current lifecycle. Sourced 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":{"Depth":"76 mm","Solid":"0.75 ... 25 mm²","Width":"18 mm","Height":"90 mm","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","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","circuit-breaker / Design":"5SJ6","Current / at AC / rated value":"25 A","Tripping characteristic class":"B","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":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=433920&mlfb=5SJ6125-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ6125-6/alternatives.json"},"ai":{"faq":[{"question":"How do I get pricing and availability for 5SJ6125-6?","answer":"Submit an RFQ through this listing. The part is sourced to order via independent distribution; current pricing and availability are confirmed at quote time."},{"question":"Will 5SJ6125-6 drop into a panel specified around 5SL4120-7CC without rewiring?","answer":"Both are 1-pole, 18 mm wide MCBs on DIN rail, so the mechanical fit is the same. But the 5SJ6125-6 is a 25 A B-curve, while the 5SL4120-7CC is a different rating/curve — verify the circuit's required current and trip characteristic before swapping."},{"question":"What is the depth of the 5SJ6125-6?","answer":"The total depth is 76 mm, with an installation depth of 70 mm into the panel."},{"question":"What wire sizes does the 5SJ6125-6 accept?","answer":"The terminals accept 0.75 to 25 mm² solid or stranded copper conductors."},{"question":"What compliance documentation is available for 5SJ6125-6?","answer":"Siemens provides RoHS, REACH, and CE declarations for this MCB. UL and CSA listings are not cited in the available specs — confirm with the factory if those are required for your jurisdiction."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ6125-6","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/5SJ6125-6 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}}