Square D QOU120 - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOU120 is a 20 A, 120 V, 1-Pole Bolt-On Molded Case Circuit Breaker designed to deliver dependable branch-circuit protection in panelboards and loadcenters. Built for durability and precise protection, it keeps electrical systems running smoothly in homes, small businesses, and light industrial environments.

Key features that set this breaker apart

• Secure bolt-on mounting provides a rigid, vibration-resistant connection to the bus, reducing the chance of loose contacts and ensuring reliable operation over time.
• Thermal-magnetic trip unit delivers stable, repeatable protection by responding accurately to both overloads and short-circuit events, helping prevent nuisance trips and equipment damage.
• OEM-compatible design is engineered to pair with matching Square D loadcenters and panelboards, streamlining installation and spares stocking.
• Versatile for multiple environments well-suited for residential panels, commercial spaces, and light-industrial applications where reliable 20 A protection is required.

Technical snapshot

• Manufacturer: Square D
• Part Number: QOU120
• 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

This breaker is a practical choice when you need immediate, trustworthy protection for individual circuits within a panelboard. It’s particularly helpful in installations where bolt-on mounting is preferred for a robust bus connection and reduced vibration, such as panels subject to HVAC cycling, workshop tools, lighting runs, or receptacle circuits in compact commercial spaces.

Use cases and who benefits

• Residential panel upgrades or new construction where 1-pole, 20 A protection is required for branch circuits
• Commercial setups with compact panelboards needing dependable 120 V protection for lighting and outlets
• Light-industrial environments that demand durable, vibration-resistant mounting and reliable trip performance

Why choose this Square D breaker

• Designed to deliver consistent trip performance across typical duty cycles found in homes and small businesses
• OEM-compatible footprint means fewer compatibility concerns during replacement or panel upgrades
• Bolt-on mounting offers superior mechanical stability in panels that experience vibration or frequent load changes

Practical installation notes

Before installing, confirm that the panelboard is compatible with bolt-on, 1-pole, 20 A Square D breakers and follow all national and local electrical codes. Ensure power is fully shut off, use the proper torque for mounting per panel manufacturer guidelines, and verify labeling after installation. This 20 A, 120 V unit is ideal for protecting individual branch circuits where space and reliability matter most.

With the Square D QOU120, you get a reliable, purpose-driven solution for safeguarding your electrical system’s critical loads—delivering peace of mind through robust construction, precise protection, and OEM-backed compatibility.