{"product_id":"square-d-pka36040u31a-400a-600v-3-pole-plug-in-circuit-breaker","title":"Square D PKA36040U31 A - 400 A, 600 V, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D PKA36040U31A 400A, 600V, 3-pole plug-in molded case circuit breaker from AmpState. Built for dependable branch circuit overcurrent and short-circuit protection, this unit is ready to elevate reliability in panelboards and load centers across commercial, industrial, and even residential-scale installations.\u003c\/p\u003e \u003ch3\u003eKey advantages that keep systems running\u003c\/h3\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 maintenance or upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by combining thermal sensing for overload with magnetic trip for short circuits, reducing nuisance trips and safeguarding connected equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThree-pole design\u003c\/strong\u003e supports three-phase distribution, ideal for modern commercial and light-industrial electrical systems that require robust, coordinated protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eHigh-current capacity\u003c\/strong\u003e 400A rating paired with a 600V rating provides reliable protection for large feeders and main\/branch circuits in versatile panel configurations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible\u003c\/strong\u003e designed to pair with matching Square D load centers and panelboards, ensuring a precise fit and reliable performance within your established electrical architecture.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eBroad application range\u003c\/strong\u003e suitable for residential, commercial, and light industrial environments where dependable overcurrent and short-circuit protection is critical.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eWith its plug-in molded-case construction, this breaker integrates seamlessly into compatible panelboards, delivering quick upgrades or replacements without invasive rewiring. The 3-pole configuration is ideal for three-phase feeds, while the thermal-magnetic trip unit provides predictable response across varying loads and fault conditions—helping protect motors, lighting, HVAC, data-center infrastructure, and other critical circuits.\u003c\/p\u003e \u003ch3\u003eTechnical specifications at a glance\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 PKA36040U31A\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 400A\u003c\/li\u003e \u003cstrong\u003e\u003cli\u003eVoltage Rating:\u003c\/li\u003e\u003c\/strong\u003e 600V \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 \u003ch3\u003eWho it’s for and how you’ll use it\u003c\/h3\u003e\n\u003cp\u003eIdeal for facilities managers, electrical contractors, and engineers assembling or upgrading panelboards in warehouses, offices, manufacturing spaces, and other commercial or light-industrial settings. When you need a reliable, OEM-compatible plug-in breaker that can handle substantial three-phase loads, the Square D PKA36040U31A offers a straightforward path to enhanced safety and system continuity.\u003c\/p\u003e \u003cp\u003ePractical tips for installation and use:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eVerify that your panelboard is compatible with the PKA series plug-in breakers to ensure a proper fit and coordinated trip characteristics.\u003c\/li\u003e \u003cli\u003eFollow standard safety practices for live-panel work; ensure power is disconnected before installation and check torque specifications on all terminations.\u003c\/li\u003e \u003cli\u003eUse the 400A rating to protect feeder circuits and main distribution paths; pair with appropriately rated conductors and protective devices upstream and downstream.\u003c\/li\u003e \u003cli\u003eWhen replacing an existing unit, confirm the trip unit settings are appropriate for the circuit being protected to avoid nuisance trips or insufficient protection.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355358679202,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/square-d-pka36040u31-a-400-600-v-3-pole-plug-in-circuit-breaker-365.webp?v=1788752211","url":"https:\/\/www.ampstate.com\/products\/square-d-pka36040u31a-400a-600v-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}