{"product_id":"square-d-ldl36400u31x-400a-600v-3-pole-circuit-breaker","title":"Square D LDL36400U31X - 400 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D LDL36400U31X is a 400A, 600V, 3-pole molded-case circuit breaker engineered to deliver reliable branch circuit overcurrent and short-circuit protection where space and performance matter. Built to integrate with matching OEM load centers and panelboards, it’s a dependable choice for electrical distribution in homes, offices, and light industrial environments.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWhy this breaker stands out\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded-case design\u003c\/strong\u003e minimizes footprint and maximizes panel space, making it easier to fit into tighter electrical enclosures without sacrificing protection capabilities.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by combining precise current sensing with a fast magnetic trip for fault clearing — helping reduce nuisance trips while maintaining safety.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole configuration\u003c\/strong\u003e ideal for three-phase distribution or multi-pole switching, enabling clean protection of three conductors in one device.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e guaranteed compatibility with Square D load centers and panelboards for straightforward installation and reliable seating.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current capability\u003c\/strong\u003e rated at 400A and 600V, suitable for medium to heavy distribution circuits in commercial or light industrial settings.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003ePractical applications\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eResidential and small commercial panels requiring robust branch-circuit protection for heavy circuits like subpanels, motors, or HVAC equipment.\u003c\/li\u003e \u003cli\u003eCommercial office spaces with three-phase distribution needing dependable protection across critical feeders.\u003c\/li\u003e \u003cli\u003eLight industrial enclosures where space is at a premium but protection levels must stay high and consistent.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eHow it integrates into your electrical system\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eInstall in compatible Square D panelboards or load centers; ensure downstream circuits are sized to the 400A rating and that wiring is appropriate for 600V systems.\u003c\/li\u003e \u003cli\u003eThermal-magnetic trip ensures dependable disconnection under overload or short-circuit, helping prevent damage to downstream devices and wiring.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003e\u003cstrong\u003eTechnical snapshot\u003c\/strong\u003e\u003c\/p\u003e \u003cul\u003e \u003cli\u003eManufacturer: Square D\u003c\/li\u003e \u003cli\u003ePart number: LDL36400U31X\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage rating: 400A\u003c\/li\u003e \u003cli\u003eVoltage rating: 600V\u003c\/li\u003e \u003cli\u003ePoles: 3\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eDesigned for the way professionals plan electrical distribution — thoughtful space efficiency, precise protection characteristics, and seamless OEM compatibility. If you’re upgrading a panel or stocking service vans with reliable protection devices, the LDL36400U31X from Square D delivers the performance you need with confidence. Purchase with AmpState for trusted support and genuine Square D reliability.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355321127074,"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_25a320f3-0f84-4c5e-b190-2b4dbb57c963.png?v=1764691294","url":"https:\/\/www.ampstate.com\/products\/square-d-ldl36400u31x-400a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}