Square D QOB150 - 50 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

Meet the Square D QOB150 — a 50-amp, 120-volt, 1-pole bolt-on molded case circuit breaker engineered for dependable branch circuit protection in panelboards and load centers. Built for residential, commercial, and light industrial applications, it delivers reliable overcurrent and short-circuit protection where it matters most.

• Secure bolt-on mounting for a rigid, vibration-resistant bus connection, helping maintain a stable electrical path even in environments with movement or vibration.
• Thermal-magnetic trip unit provides stable, repeatable protection by combining a thermal overload element with a magnetic short-circuit trip—fast response to faults without nuisance tripping.
• OEM-compatible design works with matching Square D load centers and panelboards, ensuring seamless integration with your existing infrastructure.
• Versatile for multiple sectors ideal for residential panels, commercial distribution, and light industrial circuits that require solid, local overcurrent protection.

Technical specifications at a glance

• Manufacturer: Square D
• Part Number: QOB150
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Why choose the QOB150 for your panel project? Its bolt-on design minimizes the risk of loose connections in high-vibration environments, while the thermal-magnetic trip unit provides predictable, code-compliant protection against overloads and short circuits. The 1-pole configuration is ideal for single-phase branch circuits, making it a practical upgrade or replacement in both new installations and service panel maintenance.

Use cases include upgrading aging panels in homes, equipping commercial distribution boards for reliable protection of lighting and receptacle circuits, and integrating into light industrial panels where durable, long-lasting protection is essential. When selecting a breaker for your Square D system, the QOB150 offers a precise, compatible option that aligns with your existing load centers and panelboards, ensuring consistent performance and straightforward installation.