{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7603-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7603-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7603-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7603-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7 series, miniature circuit breaker, 4-pole 3A D-curve, 400V AC, 15kA (EN 60898) / 40kA (IEC 60947-2), 72mm wide, halogen-free, sealable.","salesMarkdown":"The Siemens SENTRON 5SY7603-8 is a 4-pole (3P+N) miniature circuit breaker rated at 3 A with a D tripping characteristic, designed for 400 V AC systems. UL 1077 and CSA C22.2 No. 235 listing gives 5 kA at AC — important if the panel ships to North America. The 72 mm width (4 width units) means it occupies four 18 mm module spaces on the rail. For BOM planning: the 5SY7603-8 is a fast mover in the 5SY7 line. If you're freezing a BOM for a new panel design, this part is stable and widely stocked. No PCN or successor has been issued — it's the current build. ## Integration and compliance notes The breaker is sealable (provision for a lockout tagout hasp) and touch-protected per the product feature listing. Temperature influence is specified: max 95% RH up to 55°C, derating to 55% at 70°C, and 35% at 75°C — relevant if the breaker sits near a heat source inside the enclosure. The position of the power supply cord is any, so line and load can land on either top or bottom terminals without restriction. ## What the D-curve and ratings mean for your selection The D tripping characteristic (10–20× In magnetic trip) is the key spec for motor and transformer branch circuits. At 3 A rated current, the magnetic trip fires between 30 A and 60 A — high enough to pass the inrush of a small motor or control transformer without nuisance tripping, but still fast enough to clear a hard short. For resistive or general-purpose loads, a C-curve (5–10× In) would be more common; the D-curve here is deliberately chosen for inductive kick. The 40 kA IEC 60947-2 rating is the industrial-grade figure — it matches the typical SCCR requirement for a 400 V distribution panel in Europe. The 15 kA EN 60898 rating is the domestic/commercial standard. If your panel label requires a 25 kA SCCR at 400 V, this breaker covers it under the IEC rating; the UL 5 kA figure is lower, so verify the UL label requirement if the panel is destined for North America.","metaTitle":"Siemens SENTRON 5SY7603-8 MCB, D-curve 3A 4P 400V 15kA","metaDescription":"Siemens SENTRON 5SY7603-8 miniature circuit breaker. 4-pole 3A D-curve, 400V AC, 15kA (EN 60898) / 40kA (IEC 60947-2). Current lifecycle stage. 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","Solid":"0.75 ... 35 mm²","Width":"72 mm","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Wertebereich":"-40 ... +70 °C","Mounting type":"Quick assembly system","Number of poles":"4","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +75 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"4","Number of poles / Note":"3P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY7","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"3 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"15 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"40 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","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"Yes","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in","AWG number / as coded connectable conductor cross section":"18 ... 4"}},"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=370178&mlfb=5SY7603-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7603-8/alternatives.json"},"ai":{"faq":[{"question":"Who supplies 5SY7603-8 and how is it quoted for volume purchases?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for volume pricing and lead time."},{"question":"What is 5SY7603-8's listed depth (76 mm) on this component line?","answer":"The depth is 76 mm, with an installation depth of 70 mm behind the panel face. Width is 72 mm (4 width units at 18 mm each), height is 90 mm."},{"question":"What is 5SY7603-8's listed solid conductor range (0.75... 35 mm²)?","answer":"Both solid and stranded conductors are accepted from 0.75 mm² up to 35 mm². The combined terminals (top and bottom) handle the full range without needing separate ferrules for the larger sizes."},{"question":"Will 5SY7603-8 drop into a panel that was specified around 5SY3132-6 without rewiring?","answer":"Not directly — the 5SY3132-6 is a different pole count and rating. The 5SY7603-8 is 4-pole (3P+N) at 3 A D-curve; the alternate you mention would need to match the same poles, current, and curve for a drop-in swap. Check the existing breaker's label before substituting."},{"question":"What compliance documentation does this brand provide for 5SY7603-8 (RoHS, REACH, UL, IEC)?","answer":"The breaker carries approvals per EN 60898 (15 kA), IEC 60947-2 (40 kA AC, 15 kA DC), and UL 1077 / CSA C22.2 No. 235 (5 kA). It is halogen-free and silicon-free. For RoHS/REACH declarations, the manufacturer's standard compliance documentation applies — confirm with the supplier at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7603-8","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/5SY7603-8 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}}