{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY6303-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY6303-7","canonicalUrl":"https://aoctrl.com/siemens/5SY6303-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY6303-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY6303-7 miniature circuit breaker, 3-pole, tripping characteristic C, rated breaking capacity 6 kA (EN 60898-1) / 30 kA (IEC 60947-2), AC 400 V, 50/60 Hz.","salesMarkdown":"At DC, the part is rated 15 kA per IEC 60947-2, and under UL 1077 / CSA C22.2 No. 235 it carries 5 kA. That spread means the same breaker can serve panels specified to different regional standards — useful for a machine builder shipping globally. Rated operational voltage is 400 V AC (440 V max for multi-phase or single-phase operation), with a DC rating of 60 V (72 V max). That covers most 400 V three-phase distribution and 48–60 V DC control circuits, but not 125 V DC buswork — watch the voltage if you're paralleling batteries. Designed to IEC/EN 60898-1 (MCB standard for household and similar installations) and IEC/EN 60947-2 (low-voltage switchgear and controlgear for industrial use), plus UL 1077 / CSA C22.2 No. 235 for North American supplementary protection. The dual-standard rating means it qualifies for both IEC-based distribution panels and UL 508A industrial control panels — one part number for both worlds. Rated for ambient temperatures from -40 °C to +75 °C, with derating above 55 °C per the humidity/temperature influence table: max 95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C. The breaker carries combined terminals on both top and bottom (screw and clamp combinations per the datasheet), accepts copper conductors, and is sealable for tamper-proof applications. Neutral conductor switching is not provided — it's a 3-pole device for three-phase loads, not a 3P+N configuration.","metaTitle":"Siemens 5SY6303-7 SENTRON MCB, 3P C-Curve, 6kA/30kA","metaDescription":"Siemens 5SY6303-7 SENTRON miniature circuit breaker, 3-pole, C characteristic, 6 kA per EN 60898-1 / 30 kA per IEC 60947-2. Active production. Quoted to order.","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":"5SY6303-7","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 6kA, 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":"6 kA","according to IEC 60947-2 rated value":"30 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":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/998da2d95b57daeaebf7274b0f84c554.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=72816&mlfb=5SY6303-7"},"ai":{"faq":[{"question":"Where can I buy 5SY6303-7 and what is the lead time?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the current supply position."},{"question":"What is the closest functional second-source to 5SY6303-7?","answer":"The 5SY6332-7CC is a 3-pole C-curve MCB from the same SENTRON family but with a different breaking capacity rating. Check the specific ratings against your coordination study before substituting — the physical footprint (3 MW, 54 mm) is shared, so it drops into the same DIN-rail position without rewiring."},{"question":"What compliance documentation does 5SY6303-7 carry?","answer":"Designed to IEC/EN 60898-1, IEC/EN 60947-2, and UL 1077 / CSA C22.2 No. 235. Halogen-free and silicon-free. The manufacturer provides a declaration of conformity covering RoHS and REACH compliance upon request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY6303-7","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/5SY6303-7 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}}