{"product_id":"lm3900-circuit-breaker","title":"LM3900 | Circuit Breaker | 900A | 3-Pole | 600V","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the LM3900 Industrial Circuit Breaker—a robust, three-pole safeguard designed for demanding electrical layouts that demand precision, reliability, and straightforward compatibility. With a 900A rating and a 600V maximum, this breaker is purpose-built for industrial power distribution, retrofit projects, and replacement campaigns where exact specifications matter.\u003c\/p\u003e \u003ch2\u003eKey specifications at a glance\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage\u003c\/strong\u003e: 900A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePoles\u003c\/strong\u003e: 3-Pole (three-phase protection)\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage\u003c\/strong\u003e: 600V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart number\u003c\/strong\u003e: LM3900 — the best reference for compatibility\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy the LM3900 stands out\u003c\/h2\u003e\n\u003cp\u003eThis circuit breaker isn’t a generic drop-in. It’s engineered for industrial environments where high-current, three-phase protection is non-negotiable. The LM3900’s 3-pole configuration ensures balanced protection across all phases, reducing the risk of uneven fault currents and helping maintain equipment uptime. Its 600V rating makes it suitable for medium-voltage distribution in factories, processing lines, and heavy machinery controls, while the 900A capacity accommodates large loads without compromising safety.\u003c\/p\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eMaintenance projects where exact spec matching is required to prevent compatibility issues\u003c\/li\u003e \u003cli\u003eRetrofits of aging panels that demand a high-current, three-phase solution\u003c\/li\u003e \u003cli\u003eReplacement of failed breakers in industrial distribution networks with minimal downtime\u003c\/li\u003e \u003cli\u003eNew equipment installations within panels designed for up to 600V systems\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003ePractical considerations and best practices\u003c\/h2\u003e\n\u003cp\u003eBefore ordering, confirm fit and ratings to ensure seamless integration with your existing panel and electrical scheme. The LM3900’s compatibility hinges on matching the part number as the primary reference, so use it to verify interconnects, mounting arrangement, and trip characteristics within your specific panel model.\u003c\/p\u003e \u003cp\u003eTips for a smooth deployment:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eCoordinate with a licensed electrician to verify panel rating and wiring compatibility\u003c\/li\u003e \u003cli\u003eCross-check physical dimensions and mounting style to ensure proper clearance and secure installation\u003c\/li\u003e \u003cli\u003ePlan for routine inspection of contact wear and insulation integrity as part of your preventive maintenance program\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eHow this compares to similar solutions\u003c\/h2\u003e\n\u003cp\u003eIn contrast to lower-current or residential breakers, the LM3900 is built to handle larger three-phase loads with a focus on industrial reliability. It emphasizes compatibility and exact-match replacement, reducing rework and disruption when upgrading or refurbishing power distribution infrastructure.\u003c\/p\u003e \u003cp\u003eWhether you’re upgrading an aging panel, performing a retrofit to support higher-demand equipment, or sourcing a reliable replacement part for critical infrastructure, the LM3900 delivers clear, straightforward compatibility, robust three-phase protection, and a path to long-term electrical system resilience.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"AmpState","offers":[{"title":"Default Title","offer_id":46426457931938,"sku":"LM3900","price":2010.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/lm3900-circuit-breaker-900a-3-pole-600v-723.webp?v=1789581727","url":"https:\/\/www.ampstate.com\/products\/lm3900-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}