{"product_id":"square-d-ldl36400u33x-400a-600v-3-pole-circuit-breaker","title":"Square D LDL36400U33X - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eSquare D LDL36400U33X is a 400A, 600V, 3-pole molded case circuit breaker built to deliver dependable branch circuit overcurrent and short-circuit protection in panelboards and loadcenters. Designed to fit seamlessly with matching OEM panels, it’s a trusted choice for robust electrical protection in a range of settings.\u003c\/p\u003e \u003ch2\u003eWhy this breaker stands out\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSpace-efficient design\u003c\/strong\u003e — the compact molded case helps maximize panel occupancy, making room for additional circuits without sacrificing protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e — delivers stable, repeatable protection performance, combining thermal overload protection with instantaneous magnetic response for fast short-circuit clearance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e — specifically designed to be compatible with matching Square D loadcenters and panelboards, ensuring a reliable, plug‑in fit and proper coordination within your panel.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e — suitable for residential, commercial, and light industrial environments where a 400A, 3-pole device is required for 3‑phase systems up to 600V.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eIdeal use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eFeeder protection in commercial panelboards where three‑phase circuits require solid overcurrent and short-circuit safeguards.\u003c\/li\u003e \u003cli\u003eReplacement or upgrade in existing Square D installations to maintain system coordination and panel integrity.\u003c\/li\u003e \u003cli\u003eNew construction or retrofit projects that demand a compact, reliable 3‑pole breaker rated for higher current levels.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications\u003c\/h3\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 LDL36400U33X\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\u003eVoltage Rating:\u003c\/strong\u003e 600 V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3\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 \u003cp\u003eChoosing the LDL36400U33X means prioritizing reliability and compatibility in your electrical protection strategy. For panel health and safety, pair this 3‑pole breaker with a matching Square D loadcenter or panelboard and verify voltage and phase requirements align with your installation. Ideal for professionals who value precise protection, predictable performance, and straightforward replacement in established Square D ecosystems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355321192610,"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_b13fdb3e-81ea-444c-8132-008405ed2bca.png?v=1764691294","url":"https:\/\/www.ampstate.com\/products\/square-d-ldl36400u33x-400a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}