{"product_id":"siemens-q390-90a-240v-3-pole-plug-in-circuit-breaker","title":"Siemens Q390 - 90 A, 240 V, 3-Pole Plug-In Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Siemens Q390 — a dedicated 90 A, 240 V, 3-pole plug-in molded-case circuit breaker designed to safeguard your panelboards and load centers with precision and reliability. Built for fast, dependable protection of branch circuits, it’s the smart choice for residential, commercial, and light industrial applications.\u003c\/p\u003e \u003cp\u003e\u003cstrong\u003eWhy this breaker stands out\u003c\/strong\u003e\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eFast plug-in connection\u003c\/strong\u003e delivers quick installation or replacement, minimizing downtime on service calls or panel upgrades.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e provides stable, repeatable protection by responding appropriately to both overloads and short circuits, reducing nuisance trips and ensuring predictable behavior under fault conditions.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole, 90 A, 240 V configuration\u003c\/strong\u003e is ideal for three-phase panelboards and load centers, delivering reliable protection for three hot legs in commercial or light industrial setups.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible design\u003c\/strong\u003e ensures seamless integration with matching Siemens panelboards and other OEM load centers, supporting a clean, code-compliant installation.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVersatile protection for a range of applications\u003c\/strong\u003e—from main distribution panels to subpanels and branch circuits—without compromising performance or safety.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eTechnical specifications at a glance\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eManufacturer: Siemens\u003c\/li\u003e \u003cli\u003ePart number: Q390\u003c\/li\u003e \u003cli\u003eType: Thermal-magnetic molded-case circuit breaker\u003c\/li\u003e \u003cli\u003eAmperage rating: 90 A\u003c\/li\u003e \u003cli\u003eVoltage rating: 240 V\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 \u003ch3\u003eUse cases and ideal scenarios\u003c\/h3\u003e\n\u003cp\u003eThe Siemens Q390 is purpose-built for environments that demand quick maintenance and dependable safety. Use it to:\u003c\/p\u003e\n\u003cul\u003e \u003cli\u003eProtect three-phase distribution circuits in commercial or light industrial panelboards, ensuring balanced protection across all legs.\u003c\/li\u003e \u003cli\u003eUpgrade or replace aging breakers in existing Siemens OEM panels with a plug-in solution that reduces installation time.\u003c\/li\u003e \u003cli\u003eSupport critical loads in subpanels where rapid replacement and reliable trip performance minimize downtime.\u003c\/li\u003e \u003cli\u003eProvide robust branch-circuit protection for equipment with moderate to high inrush and continuous load profiles, thanks to its thermal-magnetic trip characteristics.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWho benefits most\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eElectrical contractors performing panel upgrades or service calls who value speed and reliability.\u003c\/li\u003e \u003cli\u003eFacility managers overseeing commercial spaces or light industrial facilities needing dependable protection with straightforward maintenance.\u003c\/li\u003e \u003cli\u003eProperty owners and builders looking for OEM-compatible components that align with Siemens panel ecosystems.\u003c\/li\u003e\n\u003c\/ul\u003e \u003cp\u003eChoosing the Siemens Q390 means prioritizing consistent protection, streamlined installation, and compatibility within Siemens’ panel ecosystems. If you’re upgrading a panel or wiring a new three-phase distribution layout, this 3-pole, 90 A plug-in breaker delivers dependable performance where it matters most.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355158466722,"sku":null,"price":710.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/siemens_breaker_and_panel_cc715c3a-646d-4d68-9fb3-197429fbd986.png?v=1764689777","url":"https:\/\/www.ampstate.com\/products\/siemens-q390-90a-240v-3-pole-plug-in-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}