{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7420-7CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7420-7CC","canonicalUrl":"https://aoctrl.com/siemens/5SY7420-7CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7420-7CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7420-7CC, 4-pole miniature circuit breaker, C tripping characteristic, 20 A rated current, 25 kA breaking capacity at 400 V AC (IEC 60947-2), 4 MW wide, IP20.","salesMarkdown":"## 20 A C-curve MCB for 400 V AC panels — 25 kA IEC breaking capacity The Siemens 5SY7420-7CC is a 4-pole miniature circuit breaker from the SENTRON 5SY7CC series, rated 20 A at 400 V AC with a C tripping characteristic. For UL 1077 / CSA C22.2 No.235 installations the interrupting rating is 5 kA, so confirm the available fault current if the panel is destined for a North American job site. Four poles (4P, 4 MW wide) with no switched neutral — the neutral conductor is not broken, so this breaker suits three-phase loads where a solid neutral is required. Combined terminals at both top and bottom mean you can feed-through or loop out without separate ring lugs. Strip length isn't stated in the spec; typical practice for this terminal class is 12-14 mm, but verify against the actual lug pocket on first sample. Width 72 mm (4 MW), height 90 mm. The sealable cover option (yes) lets the panel builder lock out tampering after commissioning — useful for rental or shared-access enclosures. ## Ambient limits and storage Operating ambient -25 to +55 °C. Storage range -40 to +75 °C — that wider band governs shipping and warehousing, not running. Humidity influence: max 95% RH at 55 °C, derating to 55% at 70 °C and 35% at 75 °C. Overvoltage category III, pollution degree not explicitly listed but typical for this class is PD2.","metaTitle":"Siemens 5SY7420-7CC SENTRON MCB, 4P C-Curve 20 A, 25 kA IEC","metaDescription":"Siemens 5SY7420-7CC SENTRON 4P miniature circuit breaker, C-curve 20 A, 25 kA breaking capacity at 400 V AC per IEC 60947-2. IP20, 4 MW. Current lifecycle. Quoted to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["Miniature Circuit Breakers (MCB)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"72 mm","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","During Storage":"-40 ... +75 °C","Number of poles":"4","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":"4","Number of poles / Note":"4P","acc. to DIN EN 61346-2":"F","acc. to DIN EN 81346-2":"F","Combined Terminal Bottom":"Yes","circuit-breaker / Design":"5SY7CC","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"20 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":"25 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 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,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/e5a11dd2714300f165e0c259491bc891.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=335403&mlfb=5SY7420-7CC","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7420-7CC/alternatives.json"},"ai":{"faq":[{"question":"Where can I buy 5SY7420-7CC and get a price?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time — submit an RFQ for a firm number."},{"question":"What is the breaking capacity of 5SY7420-7CC at 400 V AC?","answer":"25 kA per IEC 60947-2. For UL 1077 / CSA C22.2 No.235 installations the rating is 5 kA — check the available fault current if the panel is destined for a North American job site."},{"question":"What conductor sizes does the 5SY7420-7CC accept?","answer":"Solid or stranded from 0.75 mm² up to 35 mm². Screw terminals with a tightening torque of 2.5 to 3.5 N·m."},{"question":"Will 5SY7420-7CC drop into a panel specified around 5SY3132-6 without rewiring?","answer":"No direct mechanical or electrical interchangeability is documented between the 5SY7420-7CC and the 5SY3132-6. The 5SY7420-7CC is a 4-pole C-curve 20 A unit; the 5SY3132-6 is a different pole/current/curve variant. Verify the existing panel's busbar layout, terminal spacing, and load rating before substituting."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7420-7CC","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/5SY7420-7CC 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}}