Square D QO150 - 50 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

The Square D QO150 is a dependable, plug-in molded case circuit breaker engineered to protect your electrical system with precision. At 50 amps and 120 volts, this 1-pole unit is the clean, reliable choice for branch circuits in panelboards and load centers that rely on fast, secure protection against overcurrent and short circuits.

Why the QO150 stands out

• Fast plug-in connection: Designed for quick installation and effortless field replacement, helping you minimize downtime during panel maintenance or upgrades.
• Thermal-magnetic trip unit: Delivers stable, repeatable protection by combining thermal overcurrent sensing with magnetic short-circuit detection. Response is predictable across temperature changes and load variations, enhancing safety and reliability.
• 1-pole, 50A, 120V: Precisely sized for single-pole branch circuits that require solid 50-amp protection at 120 volts—ideal for specific residential, commercial, or light industrial needs.
• Plug-in molded case design: Built for durability in panelboards and load centers, with a form factor that aligns with standard Square D installations.
• OEM compatibility: Engineered to pair with matching Square D QO load centers and panelboards, ensuring proper electrical coordination and dependable performance.
• Versatile application: Suitable for a range of environments—from homes to small business settings—where reliable overcurrent and short-circuit protection is essential.

What it protects: This breaker guards branch circuits from overcurrent and short circuits, helping prevent electrical damage, reduce risk of fire, and keep your electrical system running smoothly.

Specifications at a glance

• Manufacturer: Square D
• Part Number: QO150
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 50A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

For professionals upgrading panel infrastructure or replacing a worn breaker, the Square D QO150 provides precise protection, straightforward installation, and a reliable fit within compatible QO-series panelboards and load centers. Its combination of a fast plug-in connection and a thermal-magnetic trip mechanism translates to safer operation, easier service, and lasting performance in a variety of electrical environments.