{"product_id":"square-d-lda36400u44x-400a-3-pole-plug-in-circuit-breaker","title":"Square D LDA36400U44X - 400 A, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eIntroducing the Square D LDA36400U44X — a robust 400 A, 3-pole plug-in molded case circuit breaker designed to safeguard branch circuits in panelboards and load centers. Engineered for dependable overcurrent and short-circuit protection, this breaker keeps critical electrical systems running smoothly in demanding environments.\u003c\/p\u003e \u003cp\u003eKey advantages that matter in the field:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e for rapid installation and easy replacement, minimizing panel downtime during maintenance or upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection across a range of loads and temperatures, reacting quickly to faults while reducing nuisance trips from normal inrush.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible fit\u003c\/strong\u003e designed to match with corresponding load centers and panelboards for a clean, reliable electrical interface.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole, 400 A configuration\u003c\/strong\u003e provides solid protection for heavy feeders and three-phase circuits common in commercial and light industrial applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMolded-case, plug-in construction\u003c\/strong\u003e offers rugged protection for the breaker mechanism, reducing risk of damage in dense panel installations and busy electrical rooms.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eIdeal use scenarios:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eResidential-commercial panel installations where large feeder protection is required, such as multifamily dwellings or mixed-use buildings.\u003c\/li\u003e \u003cli\u003eCommercial facilities with three-phase equipment and motor loads, where quick replacement minimizes downtime after a fault.\u003c\/li\u003e \u003cli\u003eLight industrial environments with demanding fault-current levels, where reliable thermal-magnetic protection helps prevent equipment damage.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWhat to expect in practice:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eConsistent protection: the thermal-magnetic design provides predictable tripping behavior under overloads and short circuits.\u003c\/li\u003e \u003cli\u003eMaintenance efficiency: the plug-in style enables straightforward swaps without removing the panel cover or rewiring.\u003c\/li\u003e \u003cli\u003eDurable fit: molded-case construction resists impact and wear in active electrical spaces and service fleets.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eSpecifications at a glance\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Square D\u003c\/li\u003e \u003cli\u003ePart Number: LDA36400U44X\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage Rating: 400 A\u003c\/li\u003e \u003cli\u003eNumber of Poles: 3\u003c\/li\u003e \u003cli\u003eMounting Style: Plug-in\u003c\/li\u003e \u003cli\u003eApplication: Branch circuit overcurrent and short-circuit protection\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355320897698,"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_b6937755-f2d5-4ddf-8455-35e81bbf87de.png?v=1764691289","url":"https:\/\/www.ampstate.com\/products\/square-d-lda36400u44x-400a-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}