Square D QOB250GFI - 50 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOB250GFI—a 50A, 240V, 2-pole bolt-on molded case circuit breaker built for dependable branch circuit protection in panelboards and loadcenters. This thermal-magnetic unit delivers stable, repeatable protection performance, helping your electrical system resist overloads and short circuits with confidence.

Why this breaker stands out

• Secure bolt-on mounting creates a rigid, vibration-resistant bus connection that stays tight through the life of the panel.
• Thermal-magnetic trip unit provides coordinated protection: the thermal element handles gradual overloads, while the magnetic element snaps in for fast short-circuit interruption.
• OEM-compatible design engineered to be compatible with matching Square D OEM loadcenters and panelboards, ensuring a clean fit and reliable electrical performance.
• Versatile for multiple environments ideal for residential, commercial, and light industrial applications where dependable overcurrent and short-circuit protection is essential.

Key specifications at a glance

• Manufacturer: Square D
• Part Number: QOB250GFI
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50A
• Voltage Rating: 240V
• Number of Poles: 2
• Mounting Style: Bolt-on

What problems it solves

This breaker protects wiring, outlets, and downstream devices by interrupting fault currents quickly and reliably. With a robust trip mechanism and solid bus connections, it minimizes nuisance trips and helps maintain panel integrity in demanding installations.

Practical use cases

• Residential: Feed 50A branch circuits in subpanels for high-demand appliances or HVAC equipment.
• Commercial: Protect 240V circuits in light commercial panels that power motors, compressors, or large receptacle banks.
• Light Industrial: Serve distribution panels where consistent protection and durable mounting are priorities.

Installation and upkeep tips

• Verify panelboard compatibility with the OEM loadcenter before installation.
• Use the bolt-on method to secure a solid bus connection and minimize movement from vibrations.
• Consult the manufacturer’s guidelines for installation torque and perform a post-installation trip test to confirm proper operation.
• Regularly inspect service breakers for signs of overheating or wear and replace as needed to maintain system protection.