{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4505-8","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4505-8","canonicalUrl":"https://aoctrl.com/siemens/5SY4505-8","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4505-8","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4505-8 miniature circuit breaker, D characteristic, 0.5 A rated current, 2-pole (1P+N), 10 kA breaking capacity per EN 60898, 35 kA per IEC 60947-2, IP20, 2 MW wide.","salesMarkdown":"## What the ratings mean for fit The Siemens 5SY4505-8 is a SENTRON miniature circuit breaker with a D tripping characteristic, rated 0.5 A at AC 50/60 Hz. The D curve means it tolerates inrush currents 10–20× the rated current before tripping magnetically — sized for motor-starting or transformer loads where the initial surge would nuisance-trip a B or C curve. The 2-pole 1P+N configuration switches the phase and protects the neutral, common in single-phase final subcircuits where the neutral must be switched for isolation. Breaking capacity is 10 kA per EN 60898 (the household-standard test) and 35 kA per IEC 60947-2 (the industrial-standard test). The 35 kA figure governs fault clearance in an industrial panel with high prospective short-circuit current — it safely interrupts faults up to that level without welding the contacts or cascading upstream. For a 0.5 A MCB, that SCCR headroom is generous; it means the breaker can be placed close to a large transformer or in a high-fault location without needing a current-limiting upstream device. Thermal derating is published across the operating range: 0.5 A at 35 °C, 0.47 A at 40 °C, 0.45 A at 45 °C, 0.44 A at 50 °C, 0.42 A at 55 °C, and 0.4 A at 60 °C. If the panel ambient runs above 35 °C, the continuous load must be reduced accordingly — the 0.4 A at 60 °C figure is the practical limit for a warm enclosure. ## Mounting and integration Snap-on mounting to DIN rail via the quick assembly system; 2 modular width units (36 mm wide, 76 mm deep, 90 mm tall). Installation depth is 70 mm behind the panel face. Mounting position is any orientation. The combined terminal top and bottom accept conductors for daisy-chaining busbars. IP20 with connected conductors — suitable for enclosed distribution boards, not for wet or washdown areas. Sealable, halogen-free, silicon-free. Pollution degree 3 (conductive pollution or dry non-conductive pollution that becomes conductive due to condensation — typical in industrial control panels). Overvoltage category III (fixed installation downstream of the main distribution board).","metaTitle":"Siemens 5SY4505-8 SENTRON MCB, D Curve, 0.5 A, 2-Pole, 10 kA","metaDescription":"Siemens 5SY4505-8 SENTRON miniature circuit breaker, 0.5 A rated, D tripping characteristic, 2-pole 1P+N, 10 kA breaking capacity per EN 60898, 35 kA per IEC 60947-2. Current produ","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["1-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY4505-8","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","description":"Miniature circuit breaker 230 V 10kA, 1+N-pole, D, 0.5 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Number Of Poles":"2","Type Of Voltage":"AC","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","acc. to IEC 81346-2":"F","at AC / rated value":"0.5 A","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Number Of Poles / Note":"1P+N","acc. to DIN EN 61346-2":"F","at 35 °C / rated value":"0.5 A","at 40 °C / rated value":"0.47 A","at 45 °C / rated value":"0.45 A","at 50 °C / rated value":"0.44 A","at 55 °C / rated value":"0.42 A","at 60 °C / rated value":"0.4 A","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Number Of Modular Width Units":"2","Tripping Characteristic Class":"D","acc. to EN 60898 / rated value":"10 kA","Position / Of Power Supply Cord":"Any","acc. to IEC 60947-2 / rated value":"35 kA","Product Feature / Touch Protection":"Yes","Supply Voltage Frequency / Rated Value":"50/60 Hz","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","at DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance / acc. to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Product Function / Neutral Conductor Switching":"Yes","operating voltage / at DC / rated value / maximum":"72 V","with single-phase operation / at AC / rated value":"250 V","Mechanical Service Life (Operating Cycles) / Typical":"10 000"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/46d9e2baceb22a8e11c7f583926f1ea4.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=528496&mlfb=5SY4505-8"},"ai":{"faq":[{"question":"Where can I buy 5SY4505-8 and how do I get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."},{"question":"What is 5SY4505-8's listed depth?","answer":"The depth is 76 mm, with an installation depth of 70 mm behind the panel face."},{"question":"What compliance documentation does this brand provide for 5SY4505-8?","answer":"The part is halogen-free and silicon-free, and carries IP20 protection class with connected conductors. It is designed to EN 60898 and IEC 60947-2 standards for breaking capacity."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4505-8","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/5SY4505-8 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}}