{"product_id":"westinghouse-md4k-circuit-breaker","title":"Westinghouse | MD4K | Circuit Breaker | 800A | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Westinghouse MD4K circuit breaker—a rugged, high-current protective device built for demanding power systems. With an 800A rating and 600V operating capability, the MD4K is tailored for maintenance, retrofit, and replacement scenarios where precise compatibility matters, ensuring reliable shutdown when faults occur and protecting critical loads across your distribution network.\u003c\/p\u003e \u003cp\u003eDesigned to align with Westinghouse legacy equipment, the MD4K serves as a practical, direct-fit solution for upgrades and service work. It helps you preserve systemic protection without overhauling entire panels, reducing downtime and keeping your electrical infrastructure operating smoothly.\u003c\/p\u003e \u003ch3\u003eKey specifications\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage:\u003c\/strong\u003e 800A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage:\u003c\/strong\u003e 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eReference for compatibility:\u003c\/strong\u003e Part number MD4K is the best guide for fitting your equipment\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eImportant note:\u003c\/strong\u003e Confirm fit and ratings before ordering. Use the MD4K part number as the primary reference to ensure your breaker matches your panel or disconnect gear.\u003c\/p\u003e \u003ch3\u003eWhy choose the MD4K\u003c\/h3\u003e\n\u003cp\u003eThis breaker is purpose-built for environments that rely on Westinghouse specifications, offering consistent performance where high-current protection is essential. By choosing the MD4K, you’re aligning with a proven design that supports stable operation, predictable tripping behavior, and straightforward field replacement—minimizing surprises during maintenance windows.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance replacements in legacy Westinghouse panels\u003c\/li\u003e \u003cli\u003eRetrofit projects where preserving current protection levels is critical\u003c\/li\u003e \u003cli\u003eSpare parts strategy for service fleets managing high-current distributions\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003ePractical guidance from experienced technicians: keep the panel’s catalog information handy, verify that the 800A\/600V ratings match your system load and fault-current requirements, and always have a qualified electrician perform installation. When you rely on the MD4K, you’re choosing a time-tested solution designed to deliver dependable protection for demanding commercial and industrial applications.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Westinghouse","offers":[{"title":"Default Title","offer_id":46424451219618,"sku":"MD4K","price":310.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/westinghouse-md4k-circuit-breaker-800a-600v-222.webp?v=1789363368","url":"https:\/\/www.ampstate.com\/products\/westinghouse-md4k-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}