Square D QOB350GFI - 50 A, 240 V, 3-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB350GFI is a robust 50A, 240V, 3-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection for panelboards and load centers. Built to withstand vibration and harsh operating conditions, this breaker helps you maintain a clean, safer electrical distribution system across residential, commercial, and light industrial settings.

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection, helping minimize movement and wear over time.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding to both overloads and short circuits, reducing nuisance trips and protecting downstream equipment.
• OEM-compatible design is engineered to fit matching Square D panelboards and load centers, preserving performance, labeling, and reliability.
• Versatile applications—suitable for residential, commercial, and light industrial circuits that require solid overcurrent and short-circuit protection.

Technical snapshot

• Manufacturer: Square D
• Part Number: QOB350GFI
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50 A
• Voltage Rating: 240 V
• Number of Poles: 3
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why choose this breaker for your panel

When upgrading or performing routine panel maintenance, the QOB350GFI delivers precise, reliable protection for critical loads. The combination of bolt-on stability and a thermal-magnetic trip mechanism means you get fast, predictable responses to electrical faults while maintaining a solid, vibration-free connection to the bus. Its compatibility with Square D OEM load centers ensures a clean fit and consistent performance alongside your existing protection scheme.

Ideal for upgrading service panels, distributing power to home theater and workshop circuits, or feeding lighting and HVAC in small commercial spaces, the QOB350GFI provides a dependable backbone for safe electrical distribution. From AmpState, you can trust authentic Square D components built to meet industry standards and long-term reliability.