{"product_id":"square-d-hdl36040-40a-600v-3-pole-circuit-breaker","title":"Square D HDL36040 - 40 A, 600 V, 3-Pole Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eThe Square D HDL36040 is a 40A, 600V, 3-pole molded case circuit breaker designed to deliver dependable branch-circuit protection in panelboards and load centers. Built for durable performance in residential, commercial, and light industrial environments, this unit uses a thermal-magnetic trip mechanism for stable, repeatable protection against overcurrent and short circuits.\u003c\/p\u003e \u003ch3\u003eWhy the HDL36040 stands out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eCompact molded case design\u003c\/strong\u003e maximizes panel space while maintaining robust protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides precise, consistent tripping behavior across varying load conditions, reducing nuisance trips while ensuring rapid response to faults.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole, 40A, 600V rating\u003c\/strong\u003e accommodates three-phase systems and higher-voltage circuits often found in commercial and light industrial applications.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM panel compatibility\u003c\/strong\u003e designed to integrate smoothly with matching Square D OEM load centers and panelboards for reliable, coordinated protection.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile application\u003c\/strong\u003e ideal for protecting branch circuits feeding motors, HVAC equipment, lighting, and other electrical loads in a variety of facilities.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhere and how you’ll use it\u003c\/h3\u003e\n\u003cp\u003eUse the HDL36040 to safeguard essential distribution in panelboards and load centers, particularly where a three-phase configuration and a 600V rating are required. This breaker is well-suited for commercial spaces, light industrial settings, and residential installations that demand dependable protection for multi‑wire and motor-driven circuits. Its compact form helps you optimize panel layouts without compromising protection performance.\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 HDL36040\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 40 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 \u003ch3\u003eInstallation and compatibility tips\u003c\/h3\u003e\n\u003cp\u003eFor optimal results, pair the HDL36040 with the appropriate Square D panelboard or load center designed to accept HDL-series breakers. Verify your panel’s compatibility and ensure the breaker rating matches the circuit requirements. By choosing an OEM-compatible 3-pole 40A, 600V solution, you’ll achieve coordinated protection across the distribution system with fewer compatibility issues and streamlined servicing.\u003c\/p\u003e \u003cp\u003eWhether upgrading an aging panel or outfitting a new installation, the Square D HDL36040 delivers reliable protection, efficient panel utilization, and a clear path toward safe, lasting electrical performance. Add it to your AmpState cart for a trusted, industry-standard solution that aligns with modern electrical codes and practices.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355262406818,"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_77481559-3f2b-4ce3-acd7-7b9126a64906.png?v=1764690787","url":"https:\/\/www.ampstate.com\/products\/square-d-hdl36040-40a-600v-3-pole-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}