{"product_id":"siemens-5sy4120-7","title":"Siemens 5SY4120-7 20A 1-Pole 400 V Circuit Breaker","description":"\u003cdiv\u003e\n\u003cp\u003eThe Siemens 5SY4120-7 20A 1-Pole 400 V Circuit Breaker is a purpose-built protection device designed for reliable single-circuit safety in 400 V electrical systems. As a genuine Siemens part, it combines precise protective timing with dependable construction, making it a trusted choice for installers and maintenance teams who value consistency and long-term performance.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eModel \/ Part\u003c\/strong\u003e: 5SY4120-7\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eCurrent rating\u003c\/strong\u003e: 20 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\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eWhat it does\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eProvides reliable overcurrent protection for a single branch circuit within 400 V electrical installations, helping prevent wiring damage and equipment failure.\u003c\/li\u003e \u003cli\u003eOffers a compact, easy-to-install form factor compatible with Siemens panels and standard electrical enclosures, reducing setup time in retrofit or new-build projects.\u003c\/li\u003e \u003cli\u003eClear model identification (5SY4120-7) supports straightforward maintenance, audits, and future replacements without guesswork.\u003c\/li\u003e \u003cli\u003eEngineered by Siemens to deliver consistent, repeatable trip characteristics, giving you predictable protection when it matters most.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eIdeal applications\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eCommercial and light industrial panels where a single 20 A circuit requires solid protection in a 400 V system.\u003c\/li\u003e \u003cli\u003eReplacement or upgrade scenarios in Siemens-based electrical installations that demand exact compatibility with the 5SY4120-7 specification.\u003c\/li\u003e \u003cli\u003eDedicated circuits such as lighting, receptacles, or drives within 400 V networks that benefit from reliable, straightforward protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eInstallation and usage tips\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eVerify compatibility with your panel and ensure the system voltage does not exceed 400 V.\u003c\/li\u003e \u003cli\u003eInstall with power turned off and follow standard electrical codes for safe wiring, termination, and mounting.\u003c\/li\u003e \u003cli\u003eRetain the exact part number (5SY4120-7) during replacements to maintain circuit protection consistency and panel interoperability.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eChoosing the Siemens 5SY4120-7 means opting for a dedicated, genuine component that aligns with Siemens’ quality standards and your need for dependable 20 A, 1-Pole protection in 400 V environments. It’s a precise, practical upgrade or replacement that keeps critical circuits safeguarded while fitting neatly into existing Siemens-based installations.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46423168909474,"sku":"5SY4120-7","price":276.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens-5sy4120-7-20a-1-pole-400-v-circuit-breaker-702.webp?v=1789278148","url":"https:\/\/www.ampstate.com\/products\/siemens-5sy4120-7","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}