{"schemaVersion":"matrix-product-facts/v1","identity":{"mpn":"5SY7203-7","brand":"Siemens","brandSlug":"siemens","productSlug":"5SY7203-7","canonicalUrl":"https://aoctrl.com/siemens/5SY7203-7","factsUrl":"https://aoctrl.com/api/mcp/products/5SY7203-7","rawCanonicalId":null},"summary":{"shortDescription":"Siemens SENTRON 5SY7203-7, 2-pole miniature circuit breaker, C-curve, 15 kA (EN 60898) / 40 kA (IEC 60947-2), 400 V AC, 36 mm wide.","salesMarkdown":"Its C-curve tripping characteristic means it tolerates moderate inrush — typical for motor starters, contactor coils, and small transformers — without nuisance trips, while still clearing faults fast. Rated 15 kA per EN 60898-1 and 40 kA per IEC 60947-2, it covers most panel fault-current levels up to 400 V AC. The 36 mm width occupies two modular units on a DIN rail, matching standard panel layout grids. Two breaking-capacity ratings let you size the part to the applicable standard. Under EN 60898-1 (household and similar installations) it's rated 15 kA; under IEC 60947-2 (industrial) it's rated 40 kA. For UL 1077 / CSA C22.2 No.235 supplemental protection, it carries 5 kA. The 40 kA industrial rating gives headroom for high-fault panels — useful when coordinating with an upstream 63 A or 100 A molded-case breaker without cascading. The C-curve magnetic trip (5–10× In) pairs well with motor branch circuits where the starting surge is short but significant. Any mounting position. Depth 76 mm, height 90 mm, width 36 mm — two modular units. Pollution degree 3 handles conductive dust environments typical of industrial control rooms. Compliant with IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077. Halogen-free and silicon-free construction. Overvoltage category III — suitable for fixed-installation distribution boards. Energy limitation class 3 — limits let-through energy in a fault. Sealable for lockout/tagout procedures.","metaTitle":"Siemens 5SY7203-7 SENTRON MCB, 2P C-Curve, 15/40 kA","metaDescription":"Siemens 5SY7203-7 SENTRON miniature circuit breaker, 2-pole, C-curve, 15 kA (EN 60898) / 40 kA (IEC 60947-2). Active production, sourced to order. Specifications and RFQ.","metaKeywords":null},"attributes":{"series":null,"packageCase":null,"mountingType":null,"rohsStatus":null,"productStatus":"Active","categoryPath":["2-Pole MCB (DIN Rail)"],"specifications":{"Depth":"76 mm","Width":"36 mm","title":"5SY7203-7","Height":"90 mm","Maximum":"75 °C","Minimum":"-40 °C","Sealable":"Yes","Standard":"IEC / EN 60898-1, IEC / EN 60947-2 / UL1077","description":"Miniature circuit breaker 400 V 15kA, 2-pole, C, 3 A, D=70 mm","Halogen-Free":"Yes","Silicon-Free":"Yes","Design Of Pole":"2P","Number Of Poles":"2","lifecycle_stage":"current","Fastening Method":"Quick assembly system","Mounting Position":"any","at AC rated value":"400 V","at DC rated value":"60 V","Installation Depth":"70 mm","Product Brand Name":"SENTRON","Degree Of Pollution":"3","Product Designation":"Miniature circuit breaker","protection class IP":"IP20, with connected conductors","Overvoltage Category":"III","Combined Terminal Top":"Yes","Energy Limitation Class":"3","Combined Terminal Bottom":"Yes","Suitability For Operation":"Mechanical engineering / industry","Neutral Conductor Switching":"No","Number Of Modular Width Units":"2","Position Of Power Supply Cord":"Any","Tripping Characteristic Class":"C","according to EN 60898 rated value":"15 kA","according to IEC 60947-2 rated value":"40 kA","Influence Of The Surrounding Temperature":"max. 95% to 55°C, max. 55% to 70°C, max. 35% to 75°C","Type Of Voltage Of The Operating Voltage":"AC","at DC according to IEC 60947-2 rated value":"15 kA","Value Range Of The Supply Voltage Frequency":"50/60 Hz","operating voltage at DC rated value maximum":"72 V","with multi-phase operation at AC rated value":"440 V","with single-phase operation at AC rated value":"440 V","at AC according to UL 1077 and CSA C22.2 No.235":"5 kA","vibration resistance according to IEC 60068-2-6":"±1mm at 5 to 25Hz; 50m/s² at 25 to 150Hz","Mechanical Service Life (Operating Cycles) Typical":"10 000","Product Extension Installable Supplementary Devices":"Yes","supply voltage with single-phase operation at AC rated value":"230 V","power loss [W] for rated value of the current at AC in hot operating state per pole":"1.3 W"}},"commercial":{"minOrderQty":null,"leadTime":null,"referencePrice":null,"stockQuantity":0,"priceTiers":null},"links":{"datasheetUrl":"https://cdn.aoctrl.com/7209333137faf8572f087d5e7a906e88.pdf","sourceUrl":"https://support.industry.siemens.com/webbackend/api/ProductSupport/TechnicalData?language=en&region=cn&productId=212786&mlfb=5SY7203-7"},"ai":{"faq":[{"question":"Where can I buy 5SY7203-7 and what is the lead time?","answer":"Sourced and quoted to order against an RFQ through independent distribution. Availability and current pricing confirmed at quote time."},{"question":"What is the breaking capacity of 5SY7203-7?","answer":"15 kA per EN 60898-1, 40 kA per IEC 60947-2, and 5 kA per UL 1077."},{"question":"What is the depth of 5SY7203-7?","answer":"76 mm."},{"question":"What is the width of 5SY7203-7?","answer":"36 mm — two modular units on a DIN rail."},{"question":"Will 5SY7203-7 drop into a panel specified around 5SY4140-7 without rewiring?","answer":"Both are 2-pole SENTRON MCBs with the same 36 mm width and DIN-rail mount, so physical fit is identical. However, verify the rated current and breaking capacity of the original 5SY4140-7 against the 5SY7203-7's ratings — the C-curve and pole count match, but the amp rating may differ."},{"question":"What compliance documentation does Siemens provide for 5SY7203-7?","answer":"The part is compliant with IEC / EN 60898-1, IEC / EN 60947-2, and UL 1077. Halogen-free and silicon-free. Standard documentation includes the declaration of conformity; specific RoHS/REACH statements are available on request."}],"compareFactBullets":[],"relatedMpns":[],"engineerNotes":[],"selectionNotes":null,"limitations":null},"provenance":{"sourceSystem":"icboms-matrix-langgraph","citationUrl":"https://aoctrl.com/siemens/5SY7203-7","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/5SY7203-7 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}}