{"product_id":"siemens-5sy4125-7","title":"Siemens 5SY4125-7 25A 1-Pole 400 V Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing the Siemens \u003cstrong\u003e5SY4125-7 25A 1-Pole 400 V Circuit Breaker\u003c\/strong\u003e, a compact, dependable solution for overcurrent protection in modern electrical panels. Designed to safeguard single-phase circuits in 400 V environments, this unit interrupts fault currents quickly to prevent damage to wiring and connected equipment.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e 5SY4125-7\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCurrent rating:\u003c\/strong\u003e 25 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 1\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage rating:\u003c\/strong\u003e 400 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting:\u003c\/strong\u003e DIN-rail compatible for seamless integration in Siemens panels\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhy this matters for your electrical installations\u003c\/p\u003e \u003cp\u003eThe \u003cstrong\u003eSiemens 5SY4125-7\u003c\/strong\u003e delivers reliable, predictable protection in single-pole configurations, helping you meet safety standards and reduce the risk of overloads and short circuits. In 400 V systems—common in European and industrial setups—a 25 A single-pole breaker is an efficient way to protect individual branches such as lighting circuits, outlets, or dedicated equipment while leaving other circuits unaffected.\u003c\/p\u003e \u003cp\u003eKey benefits and practical use cases\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\u003cstrong targeted protection:\u003e Ideal for protecting a single, critical circuit without shutting down the entire panel during a fault.\u003c\/strong\u003e\u003c\/li\u003e \u003cli\u003e\u003cstrong easy replacement:\u003e Designed to slot into compatible Siemens distribution boards that support the 5SY-series breakers, making upgrades or replacements straightforward.\u003c\/strong\u003e\u003c\/li\u003e \u003cli\u003e\u003cstrong consistent performance:\u003e Built to deliver stable, predictable trip behavior within its rated 25 A, contributing to safer, more reliable electrical operation.\u003c\/strong\u003e\u003c\/li\u003e \u003cli\u003e\u003cstrong space-efficient:\u003e A 1-pole design that fits neatly into compact panel layouts, helping you maximize busbar efficiency in crowded boards.\u003c\/strong\u003e\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWho should consider the Siemens 5SY4125-7\u003c\/p\u003e \u003cul\u003e \u003cli\u003eElectricians and facilities managers maintaining Siemens-based panels and distributed protection schemes\u003c\/li\u003e \u003cli\u003eInstallers upgrading or replacing damaged or aging MCBs in 400 V single-phase circuits\u003c\/li\u003e \u003cli\u003eSite engineers assembling modular protection rows in commercial or light industrial environments\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eInstallation and best-practice tips\u003c\/p\u003e \u003cul\u003e \u003cli\u003eVerify that your panel accepts 5SY-series breakers and that the single-pole configuration aligns with the target circuit.\u003c\/li\u003e \u003cli\u003eEnsure proper DIN-rail mounting and secure terminal connections according to panel manufacturer guidelines.\u003c\/li\u003e \u003cli\u003eMatch the breaker’s current rating (25 A) to the circuit ampacity to avoid nuisance trips while maintaining protection.\u003c\/li\u003e \u003cli\u003eUse the part number 5SY4125-7 when ordering to ensure exact fit and electrical characteristics within Siemens systems.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eFor reliable, Siemens-native protection in 400 V installations, the \u003cstrong\u003eSiemens 5SY4125-7 25A 1-Pole 400 V Circuit Breaker\u003c\/strong\u003e stands out for its precise fit, consistent performance, and purpose-built compatibility with Siemens protection architectures. A smart choice for single-pole circuit protection that respects panel design and safety considerations.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46423075848354,"sku":"5SY4125-7","price":157.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-5sy4125-7-25a-1-pole-400-v-circuit-breaker-388.webp?v=1789267597","url":"https:\/\/www.ampstate.com\/products\/siemens-5sy4125-7","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}