{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7303-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7303-7","canonicalUrl":"https://aoctrl.com/siemens/5SY7303-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7303-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, Miniature circuit breaker, 5SY7303-7, 3P, 3 A, C characteristic, 15 kA / 40 kA, 3 MW units, IP20.","salesMarkdown":"Rated for ambient temperature from -40 to 75 °C, though the current must be derated above 35 °C — at 50 °C the continuous rating drops to 2.71 A, at 60 °C to 2.54 A. That derating matters if the breaker shares a crowded panel with heat sources. Certified to IEC / EN 60898-1 for residential and similar installation, and to IEC / EN 60947-2 / UL1077 for industrial applications. The dual rating means it qualifies for both a domestic consumer unit and an industrial control panel — one part number covers both jurisdictions. Sealable terminals allow the installer to lock the cover after commissioning, preventing tamper.","metaTitle":"Siemens 5SY7303-7 SENTRON MCB, 3A C-Curve 3P, 15/40 kA","metaDescription":"Siemens 5SY7303-7 SENTRON miniature circuit breaker, 3 A, C-trip curve, 3-pole, 15 kA (EN 60898) / 40 kA (IEC 60947-2). Active production. Sourced to order. Quoted against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"54 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","Number Of Poles":"3","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","at AC / rated value":"3 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","according to EN 61346-2":"F","at 35 °C / rated value":"3 A","at 40 °C / rated value":"2.86 A","at 45 °C / rated value":"2.78 A","at 50 °C / rated value":"2.71 A","at 55 °C / rated value":"2.62 A","at 60 °C / rated value":"2.54 A","Combined Terminal Bottom":"Yes","according to IEC 81346-2":"F","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"3","Tripping Characteristic Class":"C","Position / Of Power Supply Cord":"Any","according to EN 60898 / rated value":"15 kA","according to IEC 60947-2 / rated value":"40 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","Value Range / Of The Supply Voltage Frequency":"50/60 Hz","at DC / according to IEC 60947-2 / rated value":"15 kA","with multi-phase operation / at AC / rated value":"440 V","operating voltage / at DC / rated value / maximum":"72 V","vibration resistance / according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","with single-phase operation / at AC / rated value":"440 V","Mechanical Service Life (Switching Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$49.53","priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=284046&mlfb=5SY7303-7","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7303-7/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of the 5SY7303-7?","answer":"15 kA per EN 60898 and 40 kA per IEC 60947-2. The higher figure applies when the breaker is used under the industrial standard, giving headroom for high-fault panels."},{"question":"What does the C-curve mean on this 3 A breaker?","answer":"The C characteristic trips at 5 to 10 times rated current (15–30 A magnetic release). It is suited for motor and transformer inrush on a 3 A branch; for purely resistive loads a B-curve would be a better fit."},{"question":"Where can I buy the 5SY7303-7 and how is it quoted?","answer":"Sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time — no stock figures or price are published here."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7303-7","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/5SY7303-7 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}}