{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SJ4245-7HG41","brand":"Siemens","brandSlug":"siemens","productSlug":"5SJ4245-7HG41","canonicalUrl":"https://aoctrl.com/siemens/5SJ4245-7HG41","factsUrl":"https://aoctrl.com/api/mcp/products/5SJ4245-7HG41","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SJ4 series, miniature circuit breaker, order code 5SJ4245-7HG41, 2-pole, C characteristic, 45 A rated current at 40 °C, DIN-rail mount.","salesMarkdown":"The Siemens SENTRON 5SJ4245-7HG41 is a 2-pole miniature circuit breaker with C tripping characteristic, rated 45 A at both 30 °C and 40 °C ambient. The 36 mm width (2 modular units) and 70 mm depth match the 5SJ4 family footprint — a direct swap for an earlier 5SJ4 unit or a drop-in for a panel originally built around the 5SL6550-7BB, provided the terminal arrangement (combined screw terminals top and bottom, no tunnel terminals) is compatible. Rated 45 A at 40 °C — the same as at 30 °C, so no early derating in a warm panel. Above 40 °C the curve steps down: 44.1 A at 45 °C, 43.2 A at 50 °C, 42.2 A at 55 °C, 41.4 A at 60 °C. That means a 45 A circuit at 50 °C still holds 96 % of its rating; a designer sizing for a 50 °C panel ambient can treat it as a 43 A breaker without over-specifying. Vibration resistance tested to 50 m/s² at 25–150 Hz and 60 m/s² at 35 Hz (4 s) — adequate for machine-mounted panels on pumps or compressors. Listed as current-production lifecycle stage. No end-of-life notice or successor code found.","metaTitle":"Siemens SENTRON 5SJ4245-7HG41 MCB, 2-pole C-curve 45 A","metaDescription":"Siemens SENTRON 5SJ4245-7HG41 miniature circuit breaker, 2-pole, C characteristic, 45 A rated at 40 °C. DIN-rail mount, IP20/IP40. Sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"70 mm","Width":"36 mm","Height":"110 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"on standard mounting rail","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breakers","at AC / rated value":"45 A","protection class IP":"IP20, with connected conductors, IP 40 in the handle range","Overvoltage Category":"3","Tunnel Terminals Top":"No","Vibration Resistance":"50 m/s² at 25 to 150Hz and 60m/s² at 35Hz (4sec)","Combined Terminal Top":"Yes","Design Of The Product":"Miniature circuit-breaker 5SJ4","Product Function / Note":"Terminal tightening torque for Cu, 60/75°C; 3.5Nm/31lb.in","Tunnel Terminals Bottom":"No","according to EN 61346-2":"F","at 30 °C / rated value":"45 A","at 40 °C / rated value":"45 A","at 45 °C / rated value":"44.1 A","at 50 °C / rated value":"43.2 A","at 55 °C / rated value":"42.2 A","at 60 °C / rated value":"41.4 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"C","at DC / rated value / maximum":"60 V","Position / Of Power Supply Cord":"Any","Product Feature / Touch Protection":"Yes","according to EN 60898 / rated value":"10 kA","supply voltage / at AC / rated value":"400 V","according to IEC 60947-2 / rated value":"15 kA","installation environment regarding EMC":"Suitable for environment B (immunity to interference not applicable)","Type Of Voltage / Of The Operating Voltage":"AC/DC","insulation voltage (Ui) / at AC / rated value":"440 V","Product Component / Neutral Conductor Switching":"No","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/91fc2badf7c92443f7e7c4fb26aaa768.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=509153&mlfb=5SJ4245-7HG41","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SJ4245-7HG41/alternatives.json"},"ai":{"faq":[{"question":"What is the closest functional second-source for 5SJ4245-7HG41?","answer":"The 5SL6550-7BB is a 2-pole C-curve MCB in the same SENTRON family. The 5SJ4245-7HG41 shares the same DIN-rail footprint and 36 mm width, so it can drop into a panel specified around the 5SL6550-7BB without rewiring, provided the terminal style (combined screw terminals vs. tunnel terminals) matches the existing wiring."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SJ4245-7HG41","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/5SJ4245-7HG41 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}}