{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4603-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4603-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4603-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4603-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4603-8 miniature circuit breaker, D tripping characteristic, 4-pole (3P+N), 10 kA (EN 60898) / 35 kA (IEC 60947-2), 400 V AC, 72 mm wide, 76 mm deep, 90 mm high.","salesMarkdown":"The Siemens 5SY4603-8 is a SENTRON miniature circuit breaker with a D tripping characteristic, designed for 4-pole (3P+N) operation at 400 V AC. It carries a 10 kA breaking capacity per EN 60898 and 35 kA per IEC 60947-2, making it suitable for industrial panel protection where high inrush currents — typical of motor loads, transformers, or discharge lighting — demand a D-curve delay to avoid nuisance tripping. The 10 kA rating per EN 60898 covers the majority of domestic and light commercial installations. The 35 kA per IEC 60947-2 is the figure that matters for industrial switchgear — it tells you this breaker can safely interrupt a fault current up to 35 kA at 400 V AC without welding contacts or venting plasma, which is essential for coordination with upstream transformers or high-capacity busbars. Under UL 1077 and CSA C22.2 No.235 the same unit is listed at 5 kA, so if your BOM specifies a North American code, confirm the available fault current stays within that limit. The DC rating of 15 kA per IEC 60947-2 at 60 V (max 72 V) covers battery banks or DC bus protection in the same enclosure. ## Environmental and mounting details Rated for ambient temperatures from -40 °C to 75 °C, with derating for humidity (95% at 55 °C, 55% at 70 °C, 35% at 75 °C). Vibration resistance per IEC 60068-2-6 (±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz) means it holds up on machine-mounted enclosures near rotating equipment.","metaTitle":"Siemens 5SY4603-8 SENTRON MCB, D Curve, 4-Pole, 10 kA","metaDescription":"Siemens 5SY4603-8 SENTRON miniature circuit breaker, D tripping characteristic, 4-pole (3P+N), 10 kA per EN 60898, 35 kA per IEC 60947-2. Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 mm","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","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","at AC rated value":"400 V","at DC rated value":"60 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"Yes","Number Of Modular Width Units":"4","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"D","according to EN 60898 rated value":"10 kA","according to IEC 60947-2 rated value":"35 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage Of The Operating Voltage":"AC","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.2 W"}},"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=294604&mlfb=5SY4603-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY4603-8/alternatives.json"},"ai":{"faq":[{"question":"How do I get current pricing and availability for 5SY4603-8?","answer":"Pricing and availability are confirmed at quote time against an RFQ through independent distribution channels. Submit a request for a current quote."},{"question":"What compliance documentation does this brand provide for 5SY4603-8?","answer":"The breaker is certified to IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077 / CSA C22.2 No.235. The housing is halogen-free and silicon-free. Standard RoHS and REACH declarations are available from the manufacturer."},{"question":"Will 5SY4603-8 drop into a panel that was specified around 5SY4304-7CV without rewiring?","answer":"Both are 4-module-width (72 mm) SENTRON MCBs on the same DIN-rail footprint, so the mechanical fit is identical. The 5SY4603-8 uses a D tripping characteristic versus the 5SY4304-7CV's characteristic — verify that the D curve's higher magnetic trip threshold matches your load's inrush profile before swapping."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4603-8","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/5SY4603-8 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}}