{"product_id":"square-d-qo3401021-miniature-circuit-breaker-40a-3-pole-240v-plug-in-shunt-trip-qo-series","title":"Square D QO3401021 Miniature Circuit Breaker – 40A – 3 Pole – 240V – Plug-In – Shunt Trip – QO Series","description":"\u003cp\u003eThe Square D QO3401021 is a QO-series three-pole miniature circuit breaker designed for reliable overcurrent protection in residential, commercial, and light industrial 240VAC distribution systems. It features thermal magnetic protection combined with an integrated 120\/208\/240VAC shunt trip function, enabling remote tripping for safety or control system integration. This breaker is commonly used in QO load centers, NQ\/NQOD panelboards, and OEM distribution equipment.\u003c\/p\u003e\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eElectrical Ratings\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCurrent Rating: 40 A\u003c\/li\u003e\n\u003cli\u003eVoltage Rating: 240 VAC\u003c\/li\u003e\n\u003cli\u003eFrequency: 50\/60 Hz\u003c\/li\u003e\n\u003cli\u003ePhase: 3 Phase\u003c\/li\u003e\n\u003cli\u003ePoles: 3 Pole\u003c\/li\u003e\n\u003cli\u003eInterrupting Rating: 10 kA @ 240 VAC\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eProtection and Function\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eTrip Technology: Thermal Magnetic\u003c\/li\u003e\n\u003cli\u003eTrip Function: Common Trip (Overload + Short-Circuit Protection)\u003c\/li\u003e\n\u003cli\u003eProtection Type: Branch circuit protection\u003c\/li\u003e\n\u003cli\u003eAdditional Function: AC Shunt Trip (120\/208\/240VAC)\u003c\/li\u003e\n\u003cli\u003eApplication: Industrial, commercial, and control system distribution\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eConfiguration and Function\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eSeries: QO Series (Square D \/ Schneider Electric)\u003c\/li\u003e\n\u003cli\u003eModel: QO3401021\u003c\/li\u003e\n\u003cli\u003eCatalog Number: QO3401021\u003c\/li\u003e\n\u003cli\u003eFrame Type: QO Miniature Frame\u003c\/li\u003e\n\u003cli\u003eMounting Style: Plug-On\u003c\/li\u003e\n\u003cli\u003eTerminal Type: Box Lug\u003c\/li\u003e\n\u003cli\u003eCompatibility: QO Load Centers, NQOD Panelboards, OEM interiors \/ Speed-D switchboards\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eMechanical and Physical Characteristics\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eCompact molded breaker housing\u003c\/li\u003e\n\u003cli\u003ePlug-on installation for QO system compatibility\u003c\/li\u003e\n\u003cli\u003eIntegrated AC shunt trip coil for remote operation\u003c\/li\u003e\n\u003cli\u003eBox lug terminals for secure conductor termination\u003c\/li\u003e\n\u003cli\u003eDesigned for three-phase distribution systems\u003c\/li\u003e\n\u003cli\u003eWire range: 8 AWG to 2 AWG (Aluminum\/Copper)\u003c\/li\u003e\n\u003cli\u003eStandard QO-frame compact design\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003e\u003cspan role=\"text\"\u003e\u003cstrong\u003eStandards and Certifications\u003c\/strong\u003e\u003c\/span\u003e\u003c\/h2\u003e\n\u003cul\u003e\n\u003cli\u003eUL Listed\u003c\/li\u003e\n\u003cli\u003eCSA Certified\u003c\/li\u003e\n\u003cli\u003eManufactured by Schneider Electric \/ Square D\u003c\/li\u003e\n\u003cli\u003eDesigned for North American electrical distribution standards\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"Square D","offers":[{"title":"NEW","offer_id":48539905720569,"sku":"QO3401021","price":385.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0750\/7810\/7385\/files\/SchneiderElectric-TelemecaniqueSensors_QO3401021.jpg?v=1781687152","url":"https:\/\/mycircuitbreakers.com\/products\/square-d-qo3401021-miniature-circuit-breaker-40a-3-pole-240v-plug-in-shunt-trip-qo-series","provider":"My Circuit Breakers","version":"1.0","type":"link"}