{"product_id":"square-d-qob340epd-40a-240v-3-pole-bolt-on-circuit-breaker","title":"Square D QOB340EPD - 40 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D QOB340EPD 40A, 240V, 3-pole bolt-on molded case circuit breaker — a purpose-built solution for dependable branch circuit protection in panelboards and load centers. Designed for rugged reliability in residential, commercial, and light industrial settings, this unit delivers precise protection where it matters most.\u003c\/p\u003e \u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eSecure bolt-on mounting\u003c\/strong\u003e provides a rigid, vibration-resistant bus connection, so your electrical system stays protected even in environments with movement or vibration.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection by reacting to both overcurrent and short-circuit conditions, reducing nuisance trips and safeguarding sensitive equipment.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM-compatible compatibility\u003c\/strong\u003e is designed to work with matching Square D load centers and panelboards, ensuring seamless integration and reliable performance.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole design\u003c\/strong\u003e supports three-phase systems, making it suitable for a range of commercial and light industrial applications where balanced protection is critical.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhat It Protects and Where It Fits\u003c\/h3\u003e\n\u003cp\u003eThe QOB340EPD is a molded case circuit breaker intended for branch circuit overcurrent and short-circuit protection. Its bolt-on style makes it a robust choice for panelboards and load centers where space is at a premium and reliability cannot be compromised. Ideal for distributing power to lights, outlets, small motors, HVAC equipment, and other essential loads across residential and commercial environments.\u003c\/p\u003e \u003ch3\u003eTechnical Snapshot\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 QOB340EPD\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 40A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 240V\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eNumber of Poles:\u003c\/strong\u003e 3\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eMounting Style:\u003c\/strong\u003e Bolt-on\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\u003eIdeal Use Scenarios\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eNew panelboard installations or replacements in light commercial spaces requiring reliable 3-phase protection.\u003c\/li\u003e \u003cli\u003eUpgrading electrical distribution in small industrial setups where vibration resistance and durable mounting are essential.\u003c\/li\u003e \u003cli\u003eResidential-commercial hybrids with three-phase equipment or machinery connections that demand solid protection.\u003c\/li\u003e \u003cli\u003eRetrofits in OEM-compatible load centers where maintaining system performance without compatibility issues matters.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eWhy This Breaker Stands Out\u003c\/h3\u003e\n\u003cp\u003eUnlike generic solutions, the QOB340EPD combines a purpose-built bolt-on design with a thermal-magnetic trip system that remains predictable across long service lives. Its compatibility with matching OEM panels means fewer troubleshooting steps and faster commissioning. For facilities where downtime is costly, this breaker’s robust construction and precise trip characteristics help you maintain electrical safety and continuity.\u003c\/p\u003e \u003ch3\u003ePractical Tips for Getting the Most Out of Your Breaker\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eEnsure your panelboard is designed to accept bolt-on breakers from the Square D QOB family to guarantee fit and performance.\u003c\/li\u003e \u003cli\u003eUse this 40A, 240V, 3-pole unit to protect three-phase circuits feeding motors, pumps, or HVAC components, balancing protection across all legs.\u003c\/li\u003e \u003cli\u003ePlan for easy future maintenance by pairing with compatible OEM load centers, reducing the risk of mismatched components during service calls.\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355420217506,"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_71e2c531-b83d-4a1b-9c39-433c20735482.png?v=1764691990","url":"https:\/\/www.ampstate.com\/products\/square-d-qob340epd-40a-240v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}