{"product_id":"square-d-qob330-30a-240v-3-pole-bolt-on-circuit-breaker","title":"Square D QOB330 - 30 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState","description":"\u003cdiv\u003e\n\u003cp\u003eMeet the Square D QOB330—a 30 A, 240 V, 3-pole bolt-on molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. Its secure bolt-on mounting creates a rigid, vibration-resistant bus connection that stays tight under demanding conditions, helping you avoid nuisance trips and intermittent fault signals.\u003c\/p\u003e \u003ch2\u003eKey features that matter in the real world\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cstrong\u003eBolt-on mounting\u003c\/strong\u003e provides a solid, vibration-resistant bus connection for long-term reliability in both residential-adjacent and commercial installations.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eThermal-magnetic trip unit\u003c\/strong\u003e delivers stable, repeatable protection: fast magnetic response to short circuits and a responsive thermal element for overloads, reducing equipment damage and downtime.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e3-pole design\u003c\/strong\u003e supports 3-phase systems, enabling balanced protection across all conductors in 240 V circuits.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eOEM compatibility\u003c\/strong\u003e with matching Square D load centers and panelboards ensures straightforward installation and dependable performance with your existing infrastructure.\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003e30 A rating\u003c\/strong\u003e makes it ideal for protecting branch circuits feeding motors, lighting, and other essential loads in light-commercial and residential settings.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eWhy this breaker fits your panel and your schedule\u003c\/h2\u003e\n\u003cp\u003eThe QOB330 is purpose-built for panelboard and loadcenter environments where a secure, bolt-on solution is required. If your installation demands a breaker that stays put through vibration, temperature swings, and regular maintenance cycles, this Square D unit delivers. Its thermal-magnetic protection minimizes arc faults and short-circuit damage, helping you keep critical systems—like lighting, HVAC, and small motors—safer and more dependable.\u003c\/p\u003e \u003ch2\u003eTechnical specifications at a glance\u003c\/h2\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 QOB330\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 30 A\u003c\/li\u003e \u003cli\u003e\n\u003cstrong\u003eVoltage Rating:\u003c\/strong\u003e 240 V\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 \u003ch2\u003eIdeal applications and practical use cases\u003c\/h2\u003e\n\u003cul\u003e \u003cli\u003eNew installations or replacements in panelboards\/load centers that require a secure bolt-on breaker.\u003c\/li\u003e \u003cli\u003eResidential-friendly commercial spaces with 3-phase service or mixed-load panels.\u003c\/li\u003e \u003cli\u003eLight industrial environments where vibration resistance and robust connections matter for reliability.\u003c\/li\u003e \u003cli\u003eMotor loads, lighting circuits, and other branch circuits that demand consistent protection against overcurrent and short circuits.\u003c\/li\u003e \u003cli\u003eUpgrades or retrofits in OEM Square D environments to maintain compatibility and performance parity with existing gear.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch2\u003eHow it compares in practical terms\u003c\/h2\u003e\n\u003cp\u003eCompared with plug-in alternatives, the Square D QOB330’s bolt-on design emphasizes stability and bus integrity in installations subject to vibration, equipment movement, or long-term wear. Its thermal-magnetic trip mechanism provides dual protection—fast magnetic trips for sudden faults and adaptive thermal trips for sustained overloads— helping prevent damage before it cascades into costly downtime.\u003c\/p\u003e \u003cp\u003eIn short, the QOB330 is a purpose-built solution for reliable, code-compliant protection in panelboards and load centers where secure mounting, precise protection, and OEM compatibility matter most. If you’re equipping 240 V, 3-pole circuits in residential, commercial, or light industrial settings, this breaker from Square D offers a dependable, straightforward path to safer, more resilient electrical systems.\u003c\/p\u003e\n\u003c\/div\u003e","brand":"Amp State","offers":[{"title":"Default Title","offer_id":46355418742946,"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_97b60a69-d4d3-429d-9534-d217e0de8ad6.png?v=1764691980","url":"https:\/\/www.ampstate.com\/products\/square-d-qob330-30a-240v-3-pole-bolt-on-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}