{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7402-8MA","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7402-8MA","canonicalUrl":"https://aoctrl.com/siemens/5SY7402-8MA","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7402-8MA","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7402-8MA miniature circuit breaker, 4-pole, D tripping characteristic, 2 A rated current, 400 V AC, 50 kA breaking capacity per IEC 60947-2, 4 width units.","salesMarkdown":"## What this 4-pole D-curve MCB is for Terminals accept solid or stranded conductors from 0.75 to 35 mm²; tightening torque is 2.5 to 3.5 N·m. Combined terminals top and bottom simplify daisy-chaining busbars. Overvoltage category III means it is rated for fixed-installation distribution boards, not just downstream equipment. The D-curve trips magnetically at 10 to 20 times rated current (20 to 40 A), so it holds through motor inrush without nuisance tripping. Only magnetic tripping — no thermal element — so it relies on upstream or downstream overcurrent protection for sustained overloads. Sealable design allows locking the breaker in the off position for lockout/tagout. Touch protection is standard. Humidity tolerance: max 95% RH up to 55 °C, derating to 55% at 70 °C and 35% at 75 °C.","metaTitle":"Siemens 5SY7402-8MA SENTRON MCB, 4P D 2A, 50 kA IEC","metaDescription":"Siemens 5SY7402-8MA SENTRON miniature circuit breaker, 4-pole, D-curve, 2 A, 400 V AC, 50 kA breaking capacity per IEC 60947-2. Current production. Available to order.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["4-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"72 mm","title":"5SY7402-8MA","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breakers 400v Icu 50kA 4-pole, 2A, only magnetic","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":"-35 ... +70 °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","Design of the product":"Only magnetic tripping operation","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":"5SY7MA","Suitability for operation":"Industry","Current / at AC / rated value":"2 A","Tripping characteristic class":"D","at DC / rated value / maximum":"72 V","Position / of power supply cord":"Any","acc. to IEC 60947-2 / rated value":"50 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","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/990388dae97a1132040792036ae2bd7a.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=696519&mlfb=5SY7402-8MA"},"ai":{"faq":[{"question":"What is the breaking capacity of 5SY7402-8MA?","answer":"50 kA at 400 V AC per IEC 60947-2, which is the standard for industrial distribution panels."},{"question":"What conductor sizes does 5SY7402-8MA accept?","answer":"Solid or stranded conductors from 0.75 to 35 mm², with a tightening torque of 2.5 to 3.5 N·m."},{"question":"Where can I buy 5SY7402-8MA?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing are confirmed at quote time."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7402-8MA","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/5SY7402-8MA 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}}