Square D QOB250 - 50 A, 240 V, 2-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB250 from AmpState brings reliable, plug-and-play protection to your electrical panel with a purpose-built bolt-on design. This 2-pole breaker delivers solid overcurrent and short-circuit protection for branch circuits at a practical 50 A and 240 V, making it a dependable choice for residential, commercial, and light industrial applications.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus, helping maintain continuous protection even in dynamic panel environments.
• Thermal-magnetic trip unit offers stable, repeatable protection by quickly reacting to both overload and short-circuit conditions, reducing the risk of nuisance trips while safeguarding wiring and equipment.
• OEM compatibility is designed to work with matching Square D load centers and panelboards, ensuring a cohesive, reliable protection system when upgrading or expanding existing panels.
• Versatile for multiple settings—particularly suited for residential panels, commercial service entrances, and light industrial distribution where dependable branch circuit protection is essential.

Technical snapshot

• Manufacturer: Square D
• Part Number: QOB250
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50 A
• Voltage Rating: 240 V
• Number of Poles: 2
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use and deployment ideas

• Upgrade or replace a legacy panel where a 2-pole, 50 A breaker is needed to protect feeders and branch circuits in a reliable, code-aligned manner.
• Install in new construction where a compact, bolt-on solution minimizes panel space while delivering robust protection.
• Ideal for service panels in small-to-medium commercial settings and light industrial environments where consistent protection against faults is critical.

What problems it helps solve

The QOB250 targets common panel challenges: loose connections and unpredictable trips due to vibration, inconsistent protection during surge or fault events, and compatibility gaps between breakers and OEM panelboards. It provides a solid, repeatable response to overcurrent events, helping protect wiring, devices, and downstream loads while maintaining system reliability in everyday operation.

Installation and care tips

• Confirm panel compatibility with Square D QOB-series breakers to ensure seamless integration with your load center or panelboard lineup.
• Use the bolt-on mounting as intended to achieve the strongest bus connection and minimize movement from vibrations or short-term bumps.
• Follow manufacturer torque recommendations and electrical codes when installing or replacing breakers to maintain safety and performance.

Whether you’re completing a panel upgrade, stocking a service van for field repairs, or outfitting a new electrical room, the Square D QOB250 delivers dependable, industry-standard protection with a straightforward, durable design.