{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7450-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7450-8","canonicalUrl":"https://aoctrl.com/siemens/5SY7450-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7450-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7450-8, miniature circuit breaker, 4-pole, D tripping characteristic, 15 kA breaking capacity per IEC/EN 60898-1 and IEC/EN 60947-2, AC 400 V / DC 60 V rated voltage.","salesMarkdown":"## What this part does The Siemens 5SY7450-8 is a 4-pole miniature circuit breaker from the SENTRON series, with a D tripping characteristic. It is designed for branch-circuit protection in industrial control panels and distribution boards, where high inrush currents — typical of motor loads, transformers, or welding equipment — would nuisance-trip a B or C curve. The D curve tolerates short-duration surges up to 10–20 times rated current before opening, so it coordinates with downstream inductive loads without false trips. Rated breaking capacity is 15 kA per IEC/EN 60898-1 and IEC/EN 60947-2, and 15 kA at DC per IEC 60947-2. That means it can safely interrupt a fault current up to 15 kA at 400 V AC without welding contacts or cascading failure upstream. For UL 1077-listed applications, the interrupting rating is 5 kA. The part also carries pollution degree 3 and overvoltage category III ratings, so it is suited for fixed installations in industrial environments where conductive dust or condensation may be present. ## Mounting and panel fit Occupies 4 modular width units (72 mm wide) on a DIN rail. Fastening is via the quick assembly system — snap-on without tools. Mounting position is any, and the combined terminal top and bottom accept supply from either direction. Installation depth is 70 mm; overall depth is 76 mm. The enclosure is IP20 with connected conductors, so it is intended for enclosed panel use, not open washdown areas. ## Sourcing and availability The 5SY7450-8 is sourced through independent distribution and quoted to order against an RFQ. Availability and current pricing are confirmed at quote time. For volume purchases or BOM commitments, submit an RFQ through the storefront; the supply posture is active and the part can be specified into new designs without lifecycle risk.","metaTitle":"Siemens 5SY7450-8 SENTRON MCB, D Curve, 4P, 15 kA","metaDescription":"Siemens 5SY7450-8 SENTRON miniature circuit breaker, 4-pole, D tripping characteristic, 15 kA breaking capacity per IEC/EN 60898-1 and 60947-2. Current lifecycle stage, sourced to","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Width":"72 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":"4P","Number Of Poles":"4","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":"4","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":"15 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":"3.7 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":null,"sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=485861&mlfb=5SY7450-8","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7450-8/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY7450-8 and how is it quoted?","answer":"Sourced through independent distribution and quoted to order against an RFQ. Submit a request through the storefront; availability and pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7450-8","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/5SY7450-8 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}}