{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7308-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7308-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7308-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7308-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON, miniature circuit breaker, 3-pole, D characteristic, 15 kA (EN 60898-1) / 30 kA (IEC 60947-2), 400 V AC, width 54 mm, depth 76 mm, height 90 mm.","salesMarkdown":"## What the D-curve and dual breaking capacity mean for your panel A standard B- or C-curve would nuisance-trip on that first half-cycle; the D-curve lets the surge pass and clears only on a sustained fault. Breaking capacity is dual-rated: 15 kA per EN 60898-1 and 30 kA per IEC 60947-2. At 30 kA it handles high-fault-current buswork without cascading upstream — that's the number your arc-flash study cares about. Rated operational voltage is 400 V AC (440 V max in multi-phase or single-phase operation), frequency 50/60 Hz. Height 90 mm. Sealable — you can lock the handle position with a padlock for lockout/tagout. Halogen-free and silicon-free construction, which matters if this panel feeds a clean-room or semiconductor tool where outgassing contaminates optics. ## Environmental and compliance envelope Ambient operating range -40 °C to +75 °C, with humidity derating: 95% RH up to 55 °C, 55% RH up to 70 °C, 35% RH up to 75 °C. Overvoltage category III. Vibration resistance per IEC 60068-2-6: ±1 mm at 5–25 Hz, 50 m/s² at 25–150 Hz. Standards: IEC / EN 60898-1, IEC / EN 60947-2, UL 1077. The UL 1077 rating is 5 kA — that's the supplementary-protector classification, not the branch-circuit rating.","metaTitle":"Siemens 5SY7308-8 SENTRON MCB, 3P D-curve, 15/30 kA","metaDescription":"Siemens 5SY7308-8 SENTRON 3-pole miniature circuit breaker, D tripping characteristic, 15 kA per EN 60898-1 / 30 kA per IEC 60947-2. Current production. Sourced to order against RF","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","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","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":"D","according to EN 60898 rated value":"15 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":"0.8 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/5505b7247f7b158bbfc71b4f04e02a62.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=454041&mlfb=5SY7308-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7308-8/alternatives.json"},"ai":{"faq":[],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7308-8","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/5SY7308-8 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}}