Square D QO120HM - 20 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

The Square D QO120HM is a 20A, 120V, 1-pole plug-in molded case circuit breaker designed to deliver reliable branch circuit protection in panelboards and load centers. Built to safeguard your electrical distribution from overloads and short circuits, it’s a practical, durable choice for everyday circuits in homes and light commercial spaces.

• Fast plug-in connection for quick installation and straightforward replacements, reducing downtime during panel maintenance or upgrades.
• Thermal-magnetic trip unit ensures stable, repeatable protection performance against overloads and short circuits, helping prevent nuisance trips and protecting connected devices.
• 1-pole, 20A at 120V is ideal for single-phase residential circuits such as lighting, outlets, and small-appliance pathways.
• Plug-in mounting designed to fit compatible Square D QO style panelboards and load centers, enabling reliable seating and solid electrical contact.
• OEM compatibility works with matching Square D load centers and panelboards to maintain system integrity and code compliance.
• Versatile applications suitable for residential, commercial, and light industrial environments where dependable overcurrent protection is essential.

Why choose the QO120HM? It’s more than a breaker—it's a precise component that supports safe, efficient electrical distribution. With a dedicated plug-in design, you can perform quick swaps without rewiring, while the thermal-magnetic mechanism provides deterministic protection that helps protect wiring, outlets, and connected equipment.

Ideal use cases include upgrading or replacing a worn-out breaker in standard 120V panels, configuring branch circuits for living spaces, small offices, or light manufacturing areas, and maintaining consistent protection for circuits that run lighting and general receptacles.

Technical snapshot:

• Manufacturer: Square D
• Part Number: QO120HM
• Type: Thermal-magnetic molded case circuit breaker
• Amperage Rating: 20A
• Voltage Rating: 120V
• Number of Poles: 1
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Delivered by AmpState, the QO120HM is a dependable choice when you need a standard, compatible solution that fits seamlessly into existing Square D panel systems. If you’re upgrading a panel or replacing a failed breaker, this 1-pole 20A 120V unit offers a straightforward path to restoring safe, continuous power to individual circuits with confidence.