{"product_id":"square-d-qob3151021-circuit-breaker","title":"Square D | QOB3151021 | Circuit Breaker | 3-Pole | 240V | Bolt-On","description":"\u003cdiv\u003e\n\u003cb\u003eSquare D QOB3151021 — 3-Pole, 240V Bolt-On Circuit Breaker\u003c\/b\u003e \u003cp\u003eEngineered for reliability in commercial and industrial electrical panels, the QOB3151021 is a three-pole, 240-volt bolt-on circuit breaker designed for maintenance, retrofit, and replacement scenarios where exact specifications matter. This Square D component keeps your electrical protection consistent with the rest of the system, helping you maintain safe, uninterrupted power delivery.\u003c\/p\u003e \u003ch3\u003eWhat makes this breaker stand out\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003e\n\u003cb\u003eThree-Pole, 240V Configuration:\u003c\/b\u003e Suitable for three-phase circuits, delivering balanced protection across all phases in a single, integrated unit.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eBolt-On Mounting:\u003c\/b\u003e Secure, robust installation that stays firmly seated even in vibration-prone environments, reducing the risk of loose connections over time.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003ePart Number Precision (QOB3151021):\u003c\/b\u003e The exact reference you need for compatibility and seamless replacement within compatible Square D panels.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eMaintenance, Retrofit, and Replacement Ready:\u003c\/b\u003e Ideal whenever you’re upgrading, repairing, or standardizing protection in existing electrical infrastructure.\u003c\/li\u003e \u003cli\u003e\n\u003cb\u003eVoltage Rating:\u003c\/b\u003e 240V, matching standard three-phase service expectations in many commercial and industrial applications.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eIdeal use cases\u003c\/h3\u003e\n\u003cul\u003e \u003cli\u003eRetrofits in three-phase panel boards where a bolt-on 3-pole 240V breaker is required.\u003c\/li\u003e \u003cli\u003eMaintenance upgrades to restore or improve protective coordination in aging electrical systems.\u003c\/li\u003e \u003cli\u003eReplacement of failed or out-of-spec breakers with a genuine Square D part that aligns with your panel’s ratings.\u003c\/li\u003e \u003cli\u003eNew installations in systems designed around the QOB bolt-on format for durable, serviceable protection.\u003c\/li\u003e\n\u003c\/ul\u003e \u003ch3\u003eHow it benefits your project\u003c\/h3\u003e\n\u003cp\u003eChoosing the \u003cb\u003eQOB3151021\u003c\/b\u003e means you’re aligning with a trusted, OEM-rated solution that emphasizes secure mounting, clear fitment, and predictable performance. The bolt-on design minimizes the risk of arcing or loosening under load, while the three-pole layout ensures synchronized tripping across all three phases. When you’re updating a panel, this breaker helps you preserve protection coordination and simplifies future servicing thanks to its clear part-number identity and compatible bolt-on footprint.\u003c\/p\u003e \u003ch3\u003eCompatibility and practical notes\u003c\/h3\u003e\n\u003cp\u003eBefore ordering, confirm that your panel accepts a 3-pole, 240V bolt-on breaker with the same form factor. The part number QOB3151021 is the most reliable reference for compatibility, ensuring you don’t mismatch with non-bolt-on or different-pole configurations. If you’re planning a retrofit or replacement, review your existing panel’s specifications and ensure the trip characteristics and ratings match your system requirements.\u003c\/p\u003e \u003ch3\u003eInstallation and safety considerations\u003c\/h3\u003e\n\u003cp\u003eInstall with the power fully de-energized and follow your panel manufacturer’s installation instructions. Bolt-on breakers require proper alignment with the bus and mounting point to maintain a solid electrical connection. If you’re unsure about the fitment or the panel’s ratings, consult documentation for your specific Square D enclosure or reach out to a qualified electrician to verify compatibility.\u003c\/p\u003e \u003cp\u003eWhen you need a dependable, OEM-grade solution for three-phase protection at 240V, the Square D QOB3151021 delivers a concrete, serviceable choice for retrofit, maintenance, or replacement projects. \u003c\/p\u003e\n\u003c\/div\u003e","brand":"Square D","offers":[{"title":"Default Title","offer_id":46425621594274,"sku":"QOB3151021","price":802.0,"currency_code":"CAD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0666\/8094\/6850\/files\/master_generic_a085eff1-75dd-47ee-b131-4c8df8f0489b.png?v=1765492976","url":"https:\/\/www.ampstate.com\/products\/square-d-qob3151021-circuit-breaker","provider":"Ampstate Electric Corporation","version":"1.0","type":"link"}