Square D QOU240 - 40 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

< p>Meet the Square D QOU240 — a dependable 40A, 240V, 2‑pole bolt‑on molded case circuit breaker designed to protect your panelboards and load centers from overcurrent and short circuits. Built for consistent performance in residential, commercial, and light industrial environments, this device is engineered for a secure, long‑lasting connection and precise protection when it matters most.

Key advantages that matter in real-world use

• Bolt‑on mounting for a rigid, vibration‑resistant bus connection: the secure screw‑on design stays tight under motor starts and busy electrical rooms, reducing nuisance trips and maintenance calls.
• Thermal‑magnetic trip unit: combines slow‑acting thermal protection with immediate magnetic response for fast short‑circuit interruption, delivering stable and repeatable protection across a range of loads.
• 2‑pole, 40A, 240V configuration: ideal for protecting 240V branch circuits such as water heaters, HVAC equipment, subpanels, and other high‑load appliances without cluttering your panel space.
• OEM‑friendly compatibility: designed to fit and function with matching Square D OEM load centers and panelboards, making replacements straightforward and reliable.
• Durable molded‑case design: built to endure in everyday service, providing predictable performance over time.

Ideal use scenarios

This breaker shines wherever you need solid 240V branch‑circuit protection with easy installation. Common applications include:

• Residential panelboards upgrading or replacing aging breakers on 240V circuits
• Commercial electrical panels servicing HVAC units, water heaters, or large 240V equipment
• Light industrial panels where dependable protection and compact form factor are priorities

Why choose this bolt‑on model over alternatives

• Secure, vibration‑tolerant connection minimizes loosening over time, which helps sustain protection accuracy and reduces maintenance needs.
• Thermal‑magnetic response provides balanced protection—gradual overloads are handled predictably, while faults trigger rapid disconnection to prevent damage.
• Compatibility and replacement ease with Square D OEM panels means fewer compatibility questions and quicker installations, whether you’re upgrading an existing system or stocking replacement parts.

Technical snapshot

• Manufacturer: Square D
• Part number: QOU240
• Type: Thermal‑magnetic molded case circuit breaker
• Amperage rating: 40A
• Voltage rating: 240V
• Number of poles: 2
• Mounting style: Bolt‑on
• Application: Branch circuit overcurrent and short‑circuit protection

Smart installation tips

• Ensure you’re mounting in a compatible Square D panelboard or load center designed for bolt‑on breakers.
• Follow standard electrical practices for tightening mounting screws to manufacturer specifications to maintain a solid bus connection.
• Use this breaker for 240V circuits where a dedicated, two‑pole protection device is required, and pair with appropriately rated companion devices in the same panel family.

With the Square D QOU240, you’re choosing a proven solution that delivers reliable protection, straightforward installation, and compatibility with your existing Square D infrastructure. It’s an ideal choice for electricians, facilities managers, and homeowners tackling panel upgrades who demand precise performance without compromise.