{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7420-6","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7420-6","canonicalUrl":"https://aoctrl.com/siemens/5SY7420-6","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7420-6","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7 series, 4-pole miniature circuit breaker, 20 A rated current, B tripping characteristic, 15 kA breaking capacity per EN 60898, 25 kA per IEC 60947-2, 400 V AC, 72 V DC, IP20.","salesMarkdown":"## Rated for the panel, not the bench It clears faults at 15 kA per EN 60898 and 25 kA per IEC 60947-2 at 400 V AC — that IEC rating means it's certified for industrial panel applications where fault currents can exceed the residential standard. If you're feeding a 400 V three-phase sub-distribution board or a machine control cabinet, this is the interrupting rating that matters. The B curve trips at 3–5× In, so it's sized for resistive and general-purpose loads — lighting banks, control transformers, small heating elements — not motor inrush. For a 20 A circuit feeding a 4 kW resistive load on a 400 V line, this holds without nuisance tripping. DC side: rated 72 V maximum, so it can protect a 48 VDC control bus but not a 110 VDC battery bank. Touch protection is built in, which matters for live-busbar work during commissioning. Compliance documentation is standard for the SENTRON line: the breaker carries approvals per EN 60898 and IEC 60947-2, plus UL 1077 and CSA C22.2 No.235 recognition at 5 kA (AC). Halogen-free and silicon-free construction, which simplifies disposal and outgassing requirements in clean-room or sealed-panel environments. ## Deployment context Designed for mechanical engineering and industrial panel builds. The 4-pole form factor handles three-phase plus neutral (neutral conductor switching is not built in — this is a 4-pole breaker that switches all four poles, not a 3P+N with a solid neutral). Ambient temperature range -40 °C to 75 °C, with derating above 55 °C per the humidity curve (95% RH at 55 °C, 55% at 70 °C, 35% at 75 °C).","metaTitle":"Siemens 5SY7420-6 SENTRON MCB, 4P, 20 A, B curve, 15 kA","metaDescription":"Siemens 5SY7420-6 SENTRON miniature circuit breaker, 4-pole, 20 A, B tripping characteristic, 15 kA (EN 60898) / 25 kA (IEC 60947-2), 400 V AC, 72 V DC. Current lifecycle. Quoted t","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","Rated Value":"50/60 Hz","Halogen-Free":"Yes","Silicon-Free":"Yes","Mounting type":"Quick assembly system","Number of poles":"4","Type of voltage":"AC","lifecycle_stage":"current","Mounting position":"any","Installation depth":"70 mm","Product brand name":"SENTRON","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","Energy limiting class":"3","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":"5SY7","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"20 A","Tripping characteristic class":"B","at DC / rated value / maximum":"72 V","acc. to EN 60898 / rated value":"15 kA","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 DC / acc. to IEC 60947-2 / rated value":"15 kA","at AC / acc. to UL 1077 and CSA C22.2 No.235":"5 kA","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"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/58d2723589e68f3465e2ebd9189f24c0.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=302511&mlfb=5SY7420-6","alternativesUrl":"https://aoctrl.com/api/mcp/products/5SY7420-6/alternatives.json"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7420-6?","answer":"15 kA per EN 60898 and 25 kA per IEC 60947-2 at 400 V AC. For DC applications, the breaking capacity per IEC 60947-2 is 15 kA at 72 V. Under UL 1077 / CSA C22.2 No.235, the AC rating is 5 kA."},{"question":"Will 5SY7420-6 drop into a panel designed for 5SY3132-6?","answer":"The 5SY7420-6 is a 4-pole, 20 A, B-curve breaker occupying 4 width units (72 mm). The 5SY3132-6 is a different pole count and rating — verify the panel's busbar arrangement and load current before substituting. Both share the SENTRON quick-assembly mounting system, so the mechanical fit on DIN rail is the same, but the electrical ratings differ."},{"question":"Where can I buy 5SY7420-6?","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 the latest lead time and price."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7420-6","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/5SY7420-6 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}}