{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4303-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4303-7","canonicalUrl":"https://aoctrl.com/siemens/5SY4303-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4303-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4303-7, 3-pole miniature circuit breaker, C-trip characteristic, 10 kA breaking capacity per EN 60898, 35 kA per IEC 60947-2, 400 V AC, 60 V DC.","salesMarkdown":"The 5SY4303-7 carries a dual-rated breaking capacity: 10 kA per EN 60898 at 400 V AC, and 35 kA per IEC 60947-2 — the higher figure applies when the MCB is installed in an industrial distribution board where the prospective fault current exceeds 10 kA, provided the upstream transformer and cable impedance allow it. C-trip characteristic means the magnetic release picks up between 5× and 10× In — the right choice for motor-starter or transformer primary protection where inrush current would nuisance-trip a B-curve device, but still fast enough to clear a bolted fault before the downstream contactor welds shut. ## AC and DC voltage envelope Rated 400 V AC for multi-phase operation, 440 V AC for both multi-phase and single-phase operation — the 40 V headroom above the nominal 400 V line accounts for the steady-state voltage rise on a lightly loaded transformer secondary. DC rating is 60 V per pole, with a maximum operating voltage of 72 V DC — the 12 V margin above the nominal rating is the ceiling before the arc-extinction gap in a single-pole DC break becomes unreliable. ## Lifecycle and sourcing — active, quoted to order Current-production status (lifecycle stage: current). No successor or phase-out notice on record — the 5SY4303-7 is the standard catalogue variant for the 3-pole C-curve 10 kA position in the SENTRON family. IP20 with connected conductors — the terminals are finger-safe when wired, but the enclosure does not seal against water ingress. Sealable (padlockable) handle for lockout/tagout compliance. Ambient temperature range -40 °C to 75 °C, with humidity derating above 55 °C: max 95% RH at 55 °C, falling to 35% RH at 75 °C.","metaTitle":"Siemens 5SY4303-7 3-Pole MCB DIN Rail, C-Curve, 10 kA","metaDescription":"Siemens 5SY4303-7 SENTRON 3-pole MCB, C-trip characteristic, 10 kA (EN 60898) / 35 kA (IEC 60947-2). Active production. Quoted to order. IP20, sealable.","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":"5SY4303-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 10kA, 3-pole, C, 3 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"3P","Number Of Poles":"3","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","Energy Limitation Class":"3","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"C","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":"1.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$230.57","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/1c412c2c6331fd3aeb4a8acda6d7e04a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=122366&mlfb=5SY4303-7"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4303-7","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/5SY4303-7 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}}