{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4603-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4603-7","canonicalUrl":"https://aoctrl.com/siemens/5SY4603-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4603-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4603-7 miniature circuit breaker, 3P+N, 4 poles, C-curve, 3 A rated, 10 kA (EN 60898) / 35 kA (IEC 60947-2), IP20, halogen-free, silicon-free, sealable.","salesMarkdown":"## What this MCB is and where it fits The Siemens 5SY4603-7 is a 4-pole (3P+N) miniature circuit breaker from the SENTRON series, rated 3 A with a C tripping characteristic. It snaps onto a DIN rail via the quick assembly system and occupies 4 modular width units (72 mm wide). The C curve means it trips at 5–10× rated current — standard for motor and lighting circuits with moderate inrush. Rated breaking capacity is 10 kA per EN 60898 and 35 kA per IEC 60947-2, so it handles fault currents up to those levels without welding or cascading failure upstream. Installation depth is 70 mm, overall depth 76 mm, and it can be mounted in any position. Pollution degree 3 and overvoltage category III suit it for fixed installations in industrial panels where conductive dust or condensation is present. The housing is halogen-free and silicon-free — relevant for environments sensitive to corrosive off-gassing (data centers, clean rooms, food processing). Sealable terminals (top and bottom combined) allow the panel builder to lock the cover after commissioning — common for utility metering or tenant subpanels where tamper evidence is required. IP20 with connected conductors means it's protected against finger contact but not water ingress; keep it inside an enclosure. ## Thermal derating — what the 3 A rating actually delivers The 3 A rating at 35 °C is the baseline. At 45 °C it derates to 2.78 A, at 50 °C to 2.71 A, at 55 °C to 2.62 A, and at 60 °C to 2.54 A. If your panel ambient runs above 35 °C — typical in a packed enclosure with drives or transformers — you need to size the load for the derated figure, not the nameplate 3 A. The humidity envelope is also specified: max 95% RH up to 55 °C, then dropping to 55% at 70 °C and 35% at 75 °C.","metaTitle":"Siemens 5SY4603-7 SENTRON MCB, 3P+N, C-Curve, 3 A, 10 kA","metaDescription":"Siemens 5SY4603-7 SENTRON miniature circuit breaker, 3P+N, 4 poles, C-curve, 3 A rated, 10 kA breaking capacity per EN 60898, 35 kA per IEC 60947-2. Current production. Quoted to o","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"72 mm","title":"5SY4603-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 400 V 10kA, 3+N-pole, C, 3 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P+N","Number Of Poles":"4","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","acc. to IEC 81346-2":"F","at AC / rated value":"3 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","acc. to DIN EN 61346-2":"F","Energy Limitation Class":"3","at 35 °C / rated value":"3 A","at 45 °C / rated value":"2.78 A","at 50 °C / rated value":"2.71 A","at 55 °C / rated value":"2.62 A","at 60 °C / rated value":"2.54 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"4","Tripping Characteristic Class":"C","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"35 kA","Product Feature / Touch Protection":"Yes","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","Type Of Voltage / Of The Operating Voltage":"AC","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Component / Neutral Conductor Switching":"Yes","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1fe59a7dba705a3b1c5893178e53cd1e.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=238094&mlfb=5SY4603-7"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4603-7?","answer":"10 kA per EN 60898 and 35 kA per IEC 60947-2. The DC rating per IEC 60947-2 is 15 kA."},{"question":"Where can I buy 5SY4603-7 and how is it quoted?","answer":"It is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time."},{"question":"What compliance documentation does Siemens provide for 5SY4603-7?","answer":"The part is designed to EN 60898 and IEC 60947-2. It carries IP20 protection, is halogen-free and silicon-free, and is rated for pollution degree 3 and overvoltage category III."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4603-7","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/5SY4603-7 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}}