Square D QO1520 - 20 A, 120 V, 1-Pole Plug-In Circuit Breaker | AmpState

Square D QO1520 is a dependable, plug-in molded case circuit breaker designed for robust branch circuit overcurrent and short-circuit protection in panelboards and load centers. At 20A and 120V, this 1-pole device delivers precise, repeatable protection for residential, commercial, and light industrial applications. It’s the quick-to-install solution you need when replacing or upgrading a single-pole protection circuit in a QO-compatible panel.

What makes the QO1520 stand out

• Fast plug-in connection for streamlined installation and rapid replacements, minimizing downtime on service panels.
• Thermal-magnetic trip unit combines reliable thermal protection with magnetic short-circuit sensing, delivering stable, repeatable performance under varying load conditions.
• OEM-compatible design ensures easy interoperability with matching Square D QO load centers and panelboards, reducing compatibility concerns during upgrades.
• 1-pole, 20A, 120V configuration precisely matched for most lighting circuits, receptacle runs, and small appliance branches in a variety of spaces.

Ideal use cases

• Residential electrical panels where quick replacement of a single protected circuit is needed due to nuisance trips or aging hardware.
• Commercial storefronts, offices, and light industrial environments with standard 120V circuits requiring reliable overcurrent protection.
• Panelboard maintenance projects where downtime must be minimized and compatibility with existing QO systems is essential.

Performance, safety, and durability

The thermal-magnetic trip mechanism weaves long-term stability with rapid response to short circuits, helping protect wiring, devices, and connected loads from damage. Its molded case construction provides solid durability in everyday panel environments, while the plug-in mounting design supports straightforward maintenance and quick circuit reconfiguration without specialized tools. This makes the QO1520 a practical choice for upgrades, retrofits, and routine servicing in both new construction and retrofit projects.

Specifications at a glance

• Manufacturer: Square D
• Part number: QO1520
• Type: Thermal-magnetic molded case circuit breaker
• Amperage rating: 20A
• Voltage rating: 120V
• Number of poles: 1
• Mounting style: Plug-in
• Applications: Branch circuit overcurrent and short-circuit protection

Practical tips for installation and longevity

• Verify that your panelboard or load center is compatible with the QO series before replacement to ensure seamless electrical integration.
• Turn off the main power and discharge any residual voltage in the panel before handling breakers, and follow all local electrical codes during installation.
• Keep a few replacement plug-in breakers on hand for routine panel maintenance, as the fast-connect design helps reduce labor time during service calls.

For dependable, code-compliant protection of 120V branch circuits, the Square D QO1520 delivers precise, reliable performance with a plug-in convenience that installers appreciate. It’s the right fit for upgrading panelboards and load centers where space, speed, and safety matter.