{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8305-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8305-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8305-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8305-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON miniature circuit breaker, 5SY8305-7, 3-pole, C-curve, 400 V AC, 70 kA according to IEC 60947-2, 5 kA UL 1077, IP20, depth 76 mm, width 54 mm, height 90 mm.","salesMarkdown":"## What this breaker's ratings mean on a real line The Siemens 5SY8305-7 is a SENTRON miniature circuit breaker (MCB) with a C-curve tripping characteristic — magnetic trip between 5 and 10 times rated current, so it handles motor inrush without nuisance trips while still clearing hard faults. The 70 kA breaking capacity at 400 V AC (IEC 60947-2) means it can interrupt fault currents up to that level without welding its contacts or cascading upstream; that's a high-interrupting rating for a 3-module-wide (54 mm) MCB, sized for industrial main or sub-distribution panels where fault levels are stiff. At DC it breaks 15 kA per IEC 60947-2, and under UL 1077 it's rated 5 kA — so it carries dual-standard certification for panels built to either code. The 3-pole design switches all phases together (no neutral pole — neutral conductor switching is absent on this variant). The full ambient range runs from -40 °C to 75 °C, with humidity derating above 55 °C — so it's usable in unheated outdoor cabinets or near furnace lines, not just climate-controlled switchrooms. Occupies 3 modular width units (54 mm) on DIN rail, with a depth of 76 mm and an installation depth of 70 mm. The combined terminal at both top and bottom accepts supply from any position. The unit is sealable (tamper-evident cover available as an accessory), and supplementary devices (shunt trip, auxiliary contacts, alarm switch) can be installed on either side.","metaTitle":"Siemens 5SY8305-7 SENTRON MCB, 3P C-Curve, 70 kA IEC, 5 kA U","metaDescription":"Siemens 5SY8305-7 SENTRON miniature circuit breaker, 3-pole, C-curve, 70 kA at 400 V IEC 60947-2, 5 kA UL 1077. Active production. Quoted to order. Depth 76 mm, width 54 mm.","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":"5SY8305-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 3P, C0.5","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","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","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 IEC 60947-2 rated value":"70 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","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":"0.8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/639036613ce9aca3e3f74065969c1fa1.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=512057&mlfb=5SY8305-7"},"ai":{"faq":[{"question":"Where can I buy 5SY8305-7 and what is the lead time?","answer":"We source the 5SY8305-7 to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for the real ETA."},{"question":"What compliance documentation does 5SY8305-7 carry?","answer":"The 5SY8305-7 is certified to IEC / EN 60947-2 and UL 1077, and it is halogen-free and silicon-free. Overvoltage category III, degree of pollution 3. Vibration resistance tested per IEC 60068-2-6."},{"question":"Will 5SY8305-7 drop into a panel specified for 5SY4304-7CV?","answer":"Both are 3-pole SENTRON MCBs with the same 3-module DIN footprint (54 mm width, 76 mm depth). The key difference is breaking capacity: the 5SY8305-7 carries 70 kA at 400 V IEC versus the lower-rated 5SY4304-7CV. If the panel's fault level exceeds the lower breaker's rating, the 5SY8305-7 is a direct mechanical swap with higher interrupting capacity — no rewiring needed, but verify the panel's SCCR coordination."},{"question":"What is the depth of 5SY8305-7?","answer":"The depth is 76 mm, with an installation depth of 70 mm (the part that sits behind the panel face)."},{"question":"What is the width of 5SY8305-7?","answer":"The width is 54 mm, which corresponds to 3 modular width units on a standard DIN rail."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8305-7","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/5SY8305-7 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}}