{"product_id":"siemens-e21b050-circuit-breaker","title":"Siemens | E21B050 | Circuit Breaker | 50A | 1-Pole | 120V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens E21B050 Circuit Breaker — a purpose-built protection device designed for maintenance, retrofit, and replacement projects where exact specifications matter. This 50A, 1-pole breaker is engineered to deliver reliable overcurrent protection in 120V electrical systems, ensuring safe operation of connected loads.\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 50A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles:\u003c\/strong\u003e 1-Pole\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 120V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number:\u003c\/strong\u003e E21B050\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Siemens\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy this Siemens breaker stands out\u003c\/h3\u003e\n\u003cp\u003eDesigned for exact-match compatibility, the E21B050 is ideal when your panel or retrofit project requires a Siemens‑spec circuit breaker with a 50A rating. Its construction supports dependable protection for individual circuits within standard 120V systems, helping prevent overloads without nuisance trips. The part number E21B050 serves as the definitive reference for compatibility, making ordering straightforward and reducing the risk of mismatches.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance and service work on existing Siemens panels that require a 50A, 1-pole, 120V breaker\u003c\/li\u003e \u003cli\u003eRetrofits where a direct Siemens replacement is needed to maintain original panel performance\u003c\/li\u003e \u003cli\u003eReplacement scenarios that demand strict adherence to OEM specifications\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eInstallation and compatibility tips\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eBefore ordering, confirm fit and ratings using the part number E21B050 as the primary reference.\u003c\/li\u003e \u003cli\u003eVerify that your panel is designed for a 1-pole, 120V circuit and that the bus style matches Siemens’ E‑frame design.\u003c\/li\u003e \u003cli\u003eAlways power down the main, test for zero voltage, and follow the panel’s service manual during replacement to maintain safety and code compliance.\u003c\/li\u003e \u003cli\u003eEnsure the circuit you’re protecting requires a 50A rating to avoid nuisance trips or insufficient protection for heavy loads.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith the Siemens E21B050, you get a reliable, purpose-built solution for protecting individual circuits in 120V systems. It’s a practical choice for professionals and DIY enthusiasts who demand exact compatibility, clear identification, and durable performance in maintenance, retrofit, and replacement projects.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Siemens","offers":[{"title":"Default Title","offer_id":46427285258402,"sku":"E21B050","price":510.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_ad06fdd7-931c-4a09-bfbe-d05329579cd6.png?v=1765492978","url":"https:\/\/www.ampstate.com\/products\/siemens-e21b050-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}