Square D QOB120 - 20 A, 120 V, 1-Pole Bolt-On Circuit Breaker | AmpState

The Square D QOB120 is a dependable 1-pole bolt-on molded case circuit breaker designed to safeguard your panelboards and loadcenters with precise, reliable protection. At 20A and 120V, this device is purpose-built for residential, commercial, and light industrial applications where steady overcurrent and short‑circuit protection matters most.

• Bolt-on mounting provides a rigid, vibration‑resistant connection to the bus, helping maintain a solid, continuous electrical path even in environments with movement or vibration.
• Thermal-magnetic trip unit delivers stable, repeatable protection by combining thermal overload sensing with magnetic short‑circuit response, reducing nuisance trips and improving protection accuracy across temperatures.
• Molded case design offers robust insulation and a compact footprint, making it a reliable drop-in choice for shared panel spaces.
• 1-pole, 20A, 120V configuration tailored for dedicated branch circuits, making it ideal for lighting, receptacle runs, or small equipment in a single leg of your distribution system.
• OEM-compatible—designed to be used with matching Square D OEM load centers and panelboards for straightforward upgrades, replacements, and system coordination.
• Versatile installation suitable for residential, commercial, and light industrial environments where durable, predictable protection is required.

Why choose the QOB120 in your electrical panel? It combines a rugged bolt-on connection with a precise trip mechanism, specifically tuned for dependable protection of your branch circuits. This means fewer unexpected outages, consistent performance across the life of the panel, and seamless compatibility with your existing Square D infrastructure.

Practical use cases include replacing aging breakers in standard 120V panels, adding a dedicated 20A circuit for lighting or outlets, or upgrading a panelboard with a trusted, OEM‑aligned component to maintain system integrity and warranty alignment. The QOB120 is built for installers and property owners who demand clarity, reliability, and straightforward compatibility in one trusted package.

Installation tip: verify panel compatibility with a matching OEM load center or panelboard, ensure power is fully disconnected before mounting, and secure the bolt-on screws to a firm, clean connection to maintain optimal electrical contact and protection performance.