Square D QOB120EPD - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB120EPD is a 20-amp, 120-volt, 1-pole bolt-on molded case circuit breaker designed to deliver dependable branch circuit protection in panelboards and load centers. Built for residential, commercial, and light industrial installations, it offers reliable performance where it matters most—keeping circuits safe and uptime steady.

Why this breaker stands out

• Secure bolt-on mounting provides a rigid, vibration-resistant bus connection for long-lasting reliability in dynamic panels.
• Thermal-magnetic trip unit delivers stable, repeatable protection against overloads and short circuits, reducing nuisance trips while safeguarding sensitive circuits.
• OEM-compatible design ensures a precise fit with matching Square D load centers and panelboards, making upgrades or replacements straightforward.
• 1-pole, 20A, 120V configuration is ideal for protecting individual branch circuits, lighting runs, or appliance circuits within a variety of installations.
• Versatile for multiple environments suitable for residential, commercial, and light industrial applications where dependable overcurrent protection is essential.

Technical snapshot

• Manufacturer: Square D
• Part Number: QOB120EPD
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Bolt-on
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases and installation takeaways

Use the QOB120EPD to secure individual branch circuits within a compatible Square D panelboard or load center. Its bolt-on design minimizes movement and vibration at the bus connection, making it a reliable choice for panels that experience frequent door openings, panel movement, or vibration in commercial spaces. The 20A rating is well-suited for circuits that feed lighting, receptacles, or small appliances where robust protection is essential without frequent nuisance trips.

Ideal for installers and property managers looking for a drop-in replacement that aligns with OEM specifications, the QOB120EPD streamlines maintenance and reduces retrofit complexity. Pair this breaker with matching Square D components to preserve electrical system integrity, maintain warranty eligibility, and ensure consistent protection across your panelboard ecosystem.