{"product_id":"square-d-lh36400-black-circuit-breaker","title":"Square D | LH36400-BLACK | Circuit Breaker | 400A | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D LH36400-BLACK 400A 600V circuit breaker — a purpose-built protection device designed for maintenance, retrofit, and replacement projects where exact matching specs are essential. This LH36400-BLACK variant delivers reliable interruption capability in demanding electrical environments while preserving the integrity of your Square D installations.\u003c\/p\u003e \u003ch2\u003eKey benefits that matter in the real world\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003ePrecise electrical performance:\u003c\/strong\u003e 400A amperage and a 600V rating provide robust fault protection for industrial and commercial power systems.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eColor\/finish variant:\u003c\/strong\u003e LH36400-BLACK offers a specific form factor and finish suitable for installations where matching the existing hardware appearance and specifications is important.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eClear compatibility reference:\u003c\/strong\u003e The part number LH36400-BLACK is the best reference for ensuring the correct fit in your panel or distribution setup.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application:\u003c\/strong\u003e Ideal for maintenance, retrofit, and replacement projects where exact specs must be matched to keep electrical systems compliant and safe.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWho should consider this breaker\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eElectrical maintenance teams performing panel upgrades or equipment modernization in facilities powered by Square D systems.\u003c\/li\u003e \u003cli\u003eElectrical contractors handling retrofit projects that require a 400A, 600V protection device with a specific LH36400-BLACK designation.\u003c\/li\u003e \u003cli\u003eOEMs and service technicians replacing aging breakers where a precise part reference is critical for compatibility and performance.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eUse cases and practical considerations\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eReplacement in existing Square D panels that specify 400A\/600V protection and the LH36400-BLACK part number.\u003c\/li\u003e \u003cli\u003eMaintenance scenarios where you need to maintain consistent protection profiles to minimize electrical downtime.\u003c\/li\u003e \u003cli\u003eRetrofit projects aimed at aligning outdated protection devices with updated safety and performance standards.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eHow this model compares and why it matters\u003c\/h2\u003e\n\u003cp\u003eRather than choosing a generic breaker, the Square D LH36400-BLACK is built to align with the precise hardware geometry, rating, and compatibility expectations of Square D systems. By prioritizing a correct part number and exact amperage\/voltage ratings, you reduce the risk of mismatches that can lead to protection gaps or installation delays. Confirm fit and ratings before ordering to ensure seamless integration with your existing panels and downstream equipment.\u003c\/p\u003e \u003ch2\u003eOrdering notes\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompatibility reference:\u003c\/strong\u003e Use the LH36400-BLACK part number as the primary guide for matching your panel and system requirements.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eRatings verification:\u003c\/strong\u003e Double-check amperage (400A) and voltage (600V) to ensure this breaker meets your protection criteria.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eInstallation readiness:\u003c\/strong\u003e Have the corresponding panel model and certification documentation on hand to verify alignment with your electrical design.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46426350518434,"sku":"LH36400-BLACK","price":2010.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-lh36400-black-circuit-breaker-400a-600v-904.webp?v=1789561495","url":"https:\/\/www.ampstate.com\/products\/square-d-lh36400-black-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}