{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4303-8CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4303-8CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4303-8CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4303-8CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4CC series, miniature circuit breaker, order code 5SY4303-8CC, 3 A rated current, D characteristic, 3-pole, 400 V AC, 10 kA breaking capacity per EN 60898.","salesMarkdown":"The Siemens 5SY4303-8CC is a 3-pole SENTRON miniature circuit breaker rated 3 A with a D tripping characteristic, designed for 400 V AC circuits. It snaps onto a DIN rail (quick assembly system) and accepts conductors from 0.75 to 35 mm² solid or stranded, so it handles both control wiring and power feeds in the same terminal. The 3 A rating at 400 V AC is the continuous current it carries without tripping; the D characteristic (10–20× In magnetic trip) lets it ride through the start-up surge of a small motor or a bank of contactor coils. For UL 1077 / CSA C22.2 No. 235 applications, the interrupting rating is 5 kA, which is typical for supplementary protectors in North American control panels. Ambient temperature range is -25 to +55 °C for normal operation, with storage from -40 to +75 °C. The influence of surrounding temperature on derating is specified: max 95% RH at 55 °C, tapering to 35% RH at 75 °C. This matters if the breaker lives inside a hot, non-ventilated enclosure near other heat sources. Width is 54 mm (3 width units at 18 mm each), depth 76 mm, height 90 mm, with an installation depth of 70 mm behind the panel. Mounting position is any orientation. The combined terminal at top and bottom accepts both solid and stranded copper without ferrules, torqued to 2.5–3.5 N·m.","metaTitle":"Siemens 5SY4303-8CC SENTRON MCB, 3A D-Curve, 3P, 10kA","metaDescription":"Siemens 5SY4303-8CC SENTRON miniature circuit breaker, 3 A, D tripping characteristic, 3-pole, 400 V AC, 10 kA breaking capacity per EN 60898. Sourced to order against RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["3-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"54 mm","title":"5SY4303-8CC","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 400 V 10kA, 3-pole, D, 3 A","Halogen-Free":"Yes","Silicon-Free":"Yes","Wertebereich":"-25 ... +55 °C","Mounting type":"Quick assembly system","Number of poles":"3","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","Ambient temperature":"-40 ... +75 °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":"3","Number of poles / Note":"3P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY4CC","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"3 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"10 kA","Position / of power supply cord":"Any","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 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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/4bb67d5f636f6e807f2b2abb63397c94.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=228333&mlfb=5SY4303-8CC"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY4303-8CC?","answer":"10 kA per EN 60898 at 400 V AC, and 5 kA per UL 1077 / CSA C22.2 No. 235."},{"question":"Where can I buy 5SY4303-8CC?","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."},{"question":"What conductor sizes does 5SY4303-8CC accept?","answer":"Solid and stranded copper from 0.75 to 35 mm², with combined top and bottom terminals torqued to 2.5–3.5 N·m."},{"question":"Will 5SY4303-8CC drop into a panel built for 5SY3132-6?","answer":"Both are 3-pole SENTRON MCBs on the same DIN-rail footprint, but the 5SY3132-6 is a different current/curve variant. The 5SY4303-8CC is a 3 A D-curve; check your BOM's required rating before swapping. Physical dimensions (width 54 mm, depth 76 mm) are the same series standard, so no rewiring for fit is needed if the rating matches."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4303-8CC","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/5SY4303-8CC 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}}