{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY4250-6CC","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY4250-6CC","canonicalUrl":"https://aoctrl.com/siemens/5SY4250-6CC","factsUrl":"https://aoctrl.com/api/mcp/products/5SY4250-6CC","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY4250-6CC, 2-pole miniature circuit breaker, B-curve, 50 A rated current, 10 kA breaking capacity per EN 60898, 400 V AC, IP20.","salesMarkdown":"## What this 50 A B-curve MCB brings to a panel For UL 1077 and CSA C22.2 No. 235 applications it carries a 5 kA rating, so verify which standard governs your panel's SCCR study. The 50 A rating on a 2-pole B-curve fits mechanical engineering and industrial panels — think machine tool feeders, control transformer primaries, or branch circuits feeding multiple contactor coils and relays where the load current is well under 50 A but you want a single breaker protecting both poles. The 400 V AC rating covers line-to-line loads in three-phase systems; the maximum DC rating of 72 V means it's not your go-to for DC bus protection unless the voltage is under that threshold. ## Mounting and wiring — what fits in the DIN footprint The 76 mm depth and 90 mm height are standard for the SENTRON 5SY series, so it drops into existing panels without re-drilling gland plates. Terminals accept solid or stranded copper from 0.75 mm² up to 35 mm², which covers everything from 14 AWG control wiring up to 2 AWG feeder conductors. The screw terminals require 2.5 to 3.5 N·m of tightening torque — enough to hold a 35 mm² conductor without crushing it. Both top and bottom terminals are combined, meaning you can land the incoming supply on either end. The breaker is sealable for tamper-proof installations, and touch protection is built in. The closest functional peer in the same family is the 5SY7140-8CC, which is a 1-pole C-curve 40 A breaker. That's a different pole count and tripping characteristic — it won't drop into a 2-pole B-curve 50 A slot without rewiring and re-evaluating coordination. If you need a direct 2-pole B-curve 50 A replacement, the 5SY4250-6CC is the correct order code; the 5SY7140-8CC is not a form-fit-function substitute. Relative humidity tolerance is specified up to 95% at 55 °C, derating to 55% at 70 °C and 35% at 75 °C. Energy limiting class 3 indicates good let-through energy restriction for downstream equipment protection.","metaTitle":"Siemens SENTRON 5SY4250-6CC MCB, 2-Pole B-Curve 50 A, 10 kA","metaDescription":"Siemens SENTRON 5SY4250-6CC miniature circuit breaker, 2-pole, B-curve, 50 A rated current, 10 kA breaking capacity per EN 60898, 400 V AC. UL/CSA listed. Active production. Quoted","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":null,"categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Solid":"0.75 ... 35 mm²","Width":"36 mm","title":"5SY4250-6CC","Height":"90 mm","Sealable":"Yes","Stranded":"0.75 ... 35 mm²","Rated Value":"50/60 Hz","description":"Miniature circuit breaker 400 V 10kA, 2-pole, B, 50 A","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","Energy limiting class":"3","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":"5SY4CC","Suitability for operation":"Mechanical engineering / industry","Current / at AC / rated value":"50 A","Tripping characteristic class":"B","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/661d1e381df2a1ce8dda2321d6128640.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=103341&mlfb=5SY4250-6CC"},"ai":{"faq":[{"question":"Where can I buy 5SY4250-6CC and what is the lead time?","answer":"The 5SY4250-6CC is 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 lead-time estimate."},{"question":"What are the key ratings of 5SY4250-6CC?","answer":"Rated current 50 A, B-curve tripping characteristic, 2 poles, 400 V AC rated voltage, 10 kA breaking capacity per EN 60898, 5 kA per UL 1077/CSA C22.2 No. 235, IP20 protection, ambient -25 to +55 °C."},{"question":"Will 5SY4250-6CC drop into a panel specified around 5SY7140-8CC without rewiring?","answer":"No. The 5SY7140-8CC is a 1-pole breaker; the 5SY4250-6CC is 2-pole. The DIN rail footprint is the same width per pole (36 mm for 2 width units), but the wiring and busbar arrangement for a 2-pole breaker differs from a 1-pole. Rewiring is required."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY4250-6CC","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/5SY4250-6CC 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}}