Square D QO120CP - 20 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

Introducing the Square D QO120CP — a 20A, 120V, 1-pole plug-in molded case circuit breaker designed to protect individual branch circuits in panelboards and load centers.

Designed for rapid installation and straightforward replacement, this plug-in breaker snaps into compatible panelboards and load centers, so you can restore power quickly after an overload or short circuit. The thermal-magnetic trip unit provides stable, repeatable protection by combining thermal sensing for overload with magnetic trip for instantaneous short-circuit response.

Key benefits

• Fast plug-in connection means minimal downtime during maintenance or expansion.
• Thermal-magnetic protection delivers precise tripping behavior across a wide range of currents, reducing nuisance trips and protecting sensitive devices.
• OEM compatibility with matching Square D load centers and panelboards ensures a reliable, plug-and-play fit without adapters.
• Ideal for residential, commercial, and light industrial circuits needing dependable branch circuit protection.

Technical snapshot

• Manufacturer: Square D
• Part Number: QO120CP
• Type: Thermal-magnetic molded case circuit breaker
• Amperage: 20A
• Voltage: 120V
• Poles: 1
• Mounting Style: Plug-in
• Application: Branch circuit overcurrent and short-circuit protection

Practical use cases

Use the Square D QO120CP for individual lighting circuits, receptacle branches, or small equipment loads inside panelboards and load centers. When adding a new circuit in a basement remodel, a workshop, or a small office, rely on this 1-pole breaker to protect a dedicated branch with predictable, reliable trip behavior.

Why choose this over generic breakers?

Unlike generic substitutes, the QO120CP is built to the specifications of Square D's QO family, ensuring a snug, secure fit in compatible panelboards and load centers. The combination of a fast plug-in design and a robust thermal-magnetic trip curve minimizes downtime and improves circuit reliability over time.

Tips for best results

• Verify your panelboard accepts QO style plug-in breakers before replacement.
• Keep a few on hand for quick swaps during upgrades or repairs—fast replacement reduces downtime.
• Pair with matching OEM devices and labeling in your panel to maintain organized, safe electrical distribution.