{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6503-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6503-8","canonicalUrl":"https://aoctrl.com/siemens/5SY6503-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6503-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6 series, miniature circuit breaker, order code 5SY6503-8, 2-pole (1P+N), 3 A rated, D tripping characteristic, 230 V AC, 6 kA (EN 60898) / 30 kA (IEC 60947-2).","salesMarkdown":"The Siemens 5SY6503-8 is a SENTRON miniature circuit breaker rated 3 A with a D tripping characteristic, meaning it tolerates high inrush currents — typically 10–20× rated current for short durations — making it the right choice for motor, transformer, or lighting ballast circuits where the start-up surge would nuisance-trip a B- or C-curve breaker. The 1P+N configuration switches the line conductor and provides a switched neutral, common in single-phase final subcircuits where you need isolation on both poles. The 6 kA breaking capacity per EN 60898 covers most residential and light commercial panel fault levels; the 30 kA rating per IEC 60947-2 tells you the same hardware can handle industrial-grade prospective short-circuit currents when applied in an industrial distribution board, so you don't need a separate upstream current-limiting device for high-fault installations. The 5SY6503-8 mounts via Siemens' quick assembly system — snap it onto DIN rail (35 mm per EN 60715) without tools. At 36 mm width (2 width units), it occupies two adjacent 18 mm slots in a standard distribution board. Terminal capacity accepts solid or stranded conductors from 0.75 mm² up to 35 mm², so it handles both thin control wiring and heavy feeder tails. Rated for ambient temperatures from -25 °C to +55 °C, with storage from -40 °C to +75 °C — fine for unheated enclosures in temperate climates. Touch protection is built in, so live busbars are shielded after installation.","metaTitle":"Siemens 5SY6503-8 SENTRON MCB, 3 A D-curve, 2-pole 1P+N","metaDescription":"Siemens 5SY6503-8 SENTRON miniature circuit breaker, 3 A rated, D tripping characteristic, 1P+N, 6 kA (EN 60898) / 30 kA (IEC 60947-2). Active production, sourced to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +55 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"230 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"2","Number of poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY6","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":"6 kA","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"30 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 single-phase operation / at AC / rated value":"250 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=530094&mlfb=5SY6503-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY6503-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY6503-8 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead time."},{"question":"What is 5SY6503-8's listed depth?","answer":"The overall depth is 76 mm, with an installation depth of 70 mm behind the panel surface."},{"question":"What conductor sizes does 5SY6503-8 accept?","answer":"Both solid and stranded conductors from 0.75 mm² up to 35 mm² fit the terminals."},{"question":"Will 5SY6503-8 drop into a panel specified around 5SY3132-6?","answer":"Both are 2-module-wide (36 mm) SENTRON breakers on the same DIN-rail footprint, so the mechanical fit is identical. The electrical difference is the tripping curve — 5SY6503-8 is a D-curve (high inrush), while 5SY3132-6 is a different curve. Check the existing breaker's curve before swapping; the physical swap is straightforward."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6503-8","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/5SY6503-8 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}}