{"product_id":"square-d-lra36400u44x-400a-3-pole-plug-in-circuit-breaker","title":"Square D LRA36400U44X - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eProtect large electrical feeds with precision using the Square D LRA36400U44X. This 400 A, 3-pole plug-in molded case circuit breaker is engineered for dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. AmpState brings you a thoughtfully designed solution that streamlines installation and reinforces safety in demanding installations.\u003c\/p\u003e \u003ch2\u003eKey advantages that set this 400 A plug-in breaker apart\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e for quick installation and effortless replacement, minimizing downtime during panel servicing or upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by combining a thermal overload element with a magnetic instantaneous trip for severe faults.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e built to work with matching Square D loadcenters and panelboards, ensuring reliable fit and predictable performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e suitable for residential, commercial, and light industrial electrical systems that demand robust, code-compliant protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eTechnical snapshot\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eManufacturer:\u003c\/strong\u003e Square D\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003ePart Number:\u003c\/strong\u003e LRA36400U44X\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eType:\u003c\/strong\u003e Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eAmperage Rating:\u003c\/strong\u003e 400 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Plug-in\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eMain feeder protection in sizable panelboards and distributed load centers for commercial buildings.\u003c\/li\u003e \u003cli\u003eProtection for feeders and circuits in light industrial installations where three-phase, high-current protection is required.\u003c\/li\u003e \u003cli\u003eReplacement or upgrade in compatible Square D panels to preserve electrical system continuity and protection standards.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eInstallation, compatibility, and best practices\u003c\/h2\u003e\n\u003cp\u003eTo get the most out of the LRA36400U44X, pair it with compatible Square D panelboards and loadcenters designed for plug-in molded case breakers. Before installation, verify that the panel labeling supports a 400 A, 3-pole device and follow the panel manufacturer’s instructions for mounting torque and clearance. This breaker is designed to respond quickly to short circuits while reliably tolerating typical operating loads, helping you avoid nuisance trips and preserve service continuity. If you’re upgrading an aging protection scheme, this unit offers a straightforward path to enhanced fault protection without rewiring or panel modification.\u003c\/p\u003e \u003ch2\u003eWhy AmpState recommends this model\u003c\/h2\u003e\n\u003cp\u003eFor facilities and systems that demand dependable, high-current protection with minimal downtime, the Square D LRA36400U44X combines fast installation with a robust thermal-magnetic protection profile. Its three-pole configuration supports balanced three-phase protection, making it a practical choice for both new installs and panel replacements in environments where reliability matters most.\u003c\/p\u003e \u003cp\u003eReady to reinforce your electrical protection with a trusted, OEM-aligned solution? The Square D LRA36400U44X from AmpState delivers precise protection, compatibility, and ease of use in one durable package.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355329482914,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/schnieder_and_square_d_breaker_and_panel_3e721745-daf7-4c74-b00c-c191000e4552.png?v=1764691380","url":"https:\/\/www.ampstate.com\/products\/square-d-lra36400u44x-400a-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}