{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY8205-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY8205-7","canonicalUrl":"https://aoctrl.com/siemens/5SY8205-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY8205-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY8 series, miniature circuit breaker, 2-pole, C-curve, 0.5 A rated current, 70 kA breaking capacity at 400 V AC, 2 width units.","salesMarkdown":"The Siemens SENTRON 5SY8205-7 is a 2-pole miniature circuit breaker (MCB) from the 5SY8 series, rated at 0.5 A with a C tripping characteristic. It provides a 70 kA breaking capacity at 400 V AC per IEC 60947-2, giving substantial fault-current headroom for industrial panel feeders where high prospective short-circuit currents are expected. ## Breaking capacity and coordination The 70 kA rated short-circuit breaking capacity (Icu) at 400 V AC means this breaker can safely interrupt faults up to that level without upstream devices needing to clear the fault — critical for selectivity in main distribution boards or sub-distribution where the available fault current is high. At DC, the rated breaking capacity is 15 kA per IEC 60947-2, and under UL 1077 / CSA C22.2 No. 235 it carries a 5 kA interrupting rating at AC. The C-curve (tripping characteristic class C) means magnetic trip occurs at 5 to 10 times rated current, suited for moderate inrush loads like small motor starters, contactor coils, or control transformers where a B-curve would nuisance-trip but a D-curve is unnecessary. ## Mounting and panel integration Snaps onto DIN rail via the quick assembly system; occupies 2 width units (36 mm) in the enclosure. Mounting position is any, so it fits horizontal or vertical busbar arrangements without derating. Installation depth is 70 mm, with an overall depth of 76 mm including the terminal arc. Terminal capacity accepts solid or stranded conductors from 0.75 to 35 mm², with a tightening torque of 2.5 to 3.5 N·m for screw-type terminals. Combined terminals top and bottom simplify daisy-chaining. ## Environmental and compliance Rated for ambient temperatures from -25 to +55 °C, with storage from -40 to +75 °C. The housing is halogen-free and silicon-free, important for environments sensitive to outgassing (e.g., clean rooms, medical, or semiconductor support areas). Protection class is IP20 with connected conductors — standard for enclosed panel mounting. Touch protection is integrated. The part carries an overvoltage category III rating, suitable for fixed installation downstream of the main distribution board.","metaTitle":"Siemens 5SY8205-7 SENTRON MCB, 2P C-curve 0.5 A, 70 kA","metaDescription":"Siemens SENTRON 5SY8205-7 miniature circuit breaker, 2-pole, C-curve, 0.5 A rated current, 70 kA breaking capacity at 400 V AC. Current lifecycle stage. Sourced to order against RF","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","title":"5SY8205-7","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 400 V D=70 mm 25 kA according to EN 60947-2, 2P, C0.5","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"2","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-25 ... +55 °C","Product designation":"Miniature circuit breaker","Protection class IP":"IP20, with connected conductors","at AC / rated value":"400 V","Overvoltage category":"III","Combined Terminal Top":"Yes","Number of width units":"2","Number of poles / Note":"2P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY8","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"0.5 A","Tripping characteristic class":"C","at DC / rated value / maximum":"72 V","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"70 kA","Product feature / Touch protection":"Yes","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","Tightening torque / with screw-type terminals":"2.5 ... 3.5 N·m","Product function / neutral conductor switching":"No","with multi-phase operation / at AC / rated value":"440 V","with single-phase operation / at AC / rated value":"440 V","Mechanical service life (switching cycles) / typical":"10 000","Tightening torque [lbf·in] / with screw-type terminals":"22 ... 31 lbf·in","AWG number / as coded connectable conductor cross section":"18 ... 4"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":"$45.72","stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/b09b5a2ff928a0447e0f53a02b9c5c2d.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=183086&mlfb=5SY8205-7"},"ai":{"faq":[{"question":"Where can I buy 5SY8205-7 and get a price?","answer":"This part is sourced and quoted to order against an RFQ through independent distribution channels. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm price and lead-time estimate."},{"question":"What is 5SY8205-7's listed depth?","answer":"The overall depth is 76 mm; the installation depth (behind the panel face) is 70 mm."},{"question":"What conductor sizes does 5SY8205-7 accept?","answer":"The terminals accept solid or stranded conductors from 0.75 mm² up to 35 mm²."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY8205-7","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/5SY8205-7 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}}