Square D QOB240 - 40 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB240 is a rugged, 2-pole bolt-on molded case circuit breaker engineered to safeguard your electrical system with dependable branch circuit overcurrent and short‑circuit protection. Designed for use in panelboards and loadcenters, this 40 A, 240 V breaker delivers reliable performance where it matters most.

Key reasons to choose the QOB240

• Secure bolt-on mounting: Provides a rigid, vibration‑resistant bus connection that stays solid under demanding electrical loads.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection by quickly responding to overcurrent and short-circuit conditions.
• OEM-compatible: Designed to work seamlessly with matching Square D OEM load centers and panelboards, ensuring consistent protection and fit.
• Versatile for multiple environments: Suitable for residential, commercial, and light industrial applications where reliable circuit protection is essential.

Specifications at a glance

• Manufacturer: Square D
• Part Number: QOB240
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 40 A
• Voltage Rating: 240 V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

• Protecting branch circuits in residential panelboards where a 40 A, 240 V supply is required
• Upgrading or maintaining commercial loadcenters that demand secure bolt-on mounting and reliable trip performance
• Installing in light industrial setups where durable, vibration-resistant connections help reduce nuisance trips

Who benefits from the QOB240

• Electrical contractors and installers seeking a dependable, OEM-compatible 2-pole breaker
• Homeowners performing panel upgrades or repairs who need proven protection for high-demand circuits
• Facilities managers overseeing light commercial electrical systems that require consistent fault protection

With the Square D QOB240, you’re not just selecting a breaker—you’re choosing predictable protection for your panelboards and loadcenters. Its bolt-on design, thermal-magnetic trip, and OEM compatibility translate into fewer installation hassles and more reliable circuit safeguarding across a range of applications.