{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SL4303-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SL4303-7","canonicalUrl":"https://aoctrl.com/siemens/5SL4303-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SL4303-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SL4303-7, miniature circuit breaker, 3-pole, C-curve, 3 A, 400 V AC, 10 kA breaking capacity per EN 60898 and IEC 60947-2.","salesMarkdown":"## Siemens 5SL4303-7 — 3A C-curve 3-pole MCB, 10 kA, 400 V The Siemens 5SL4303-7 is a SENTRON miniature circuit breaker rated 3 A with a C-curve trip characteristic, three poles, and a 10 kA breaking capacity at 400 V AC per both EN 60898 and IEC 60947-2. That 10 kA figure is the interrupting rating the breaker can clear under fault conditions without welding its contacts — it matches the standard fault level for most residential and light-commercial distribution boards. The 3-pole design handles three-phase 400 V AC networks, with a maximum operating voltage of 440 V AC per the datasheet. Frequency range is 50/60 Hz. The IP20 rating applies only with connected conductors — the busbar and wiring must be in place for the finger-safe protection to hold. Mounting position is any, so vertical or horizontal rail orientation is fine. Sealable design allows padlocking the toggle in the off position for lockout/tagout.","metaTitle":"Siemens 5SL4303-7 SENTRON MCB, 3A C-Curve 3-Pole 10kA","metaDescription":"Siemens 5SL4303-7 SENTRON miniature circuit breaker, 3-pole, C-curve, 3A, 400V AC, 10kA breaking capacity per EN 60898. Active production. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"54 mm","title":"5SL4303-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3-pole, C, 3A","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","lifecycle_stage":"current","Mounting Position":"any","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","Energy Limitation Class":"3","Suitability For Operation":"Residential buildings/infrastructure","at DC rated value maximum":"72 V","Number Of Modular Width Units":"3","Tripping Characteristic Class":"C","supply voltage at AC rated value":"400 V","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"10 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","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.1 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5b69e2d7e81e2f42b38e770e8cc909de.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=343131&mlfb=5SL4303-7"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SL4303-7?","answer":"10 kA at 400 V AC, certified per both EN 60898 and IEC 60947-2. That is the same rating for both standards on this breaker."},{"question":"Where can I buy the 5SL4303-7 and how is it quoted?","answer":"Sourced through independent industrial-automation distribution. Quoted to order against an RFQ; current pricing and availability are confirmed at quote time."},{"question":"Will the 5SL4303-7 drop into a panel specified for the 5SL4363-7?","answer":"Yes — both are 3-pole SENTRON MCBs with identical dimensions (76 mm depth, 54 mm width, 90 mm height), same DIN-rail footprint, and same mounting position. The difference is the current rating: 3 A on the 5SL4303-7 versus 63 A on the 5SL4363-7. The 63 A variant also dissipates 5 W per pole versus 1.1 W on the 3 A unit, so thermal conditions differ, but the mechanical fit is identical."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SL4303-7","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/5SL4303-7 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}}