Square D QOB120GFI Ground Fault Circuit Breaker

Square D QOB120GFI is a 1‑pole, 20‑amp 120‑volt ground-fault circuit interrupter (GFCI) breaker in Square D’s QOB bolt‑on family. It provides ground-fault protection for a single 120 VAC branch circuit and carries a 10 kA short‑circuit interruption rating at 120 V, making it suitable for typical residential and light commercial wiring in panels that accept QOB bolts‑on breakers. The unit uses bolt‑on mounting and accepts 14–8 AWG copper or aluminum conductors, with a thermal‑magnetic trip mechanism that covers overcurrent protection in addition to its GFCI function. As a 20 A, 1‑pole device, it protects a single hot conductor on circuits where ground‑fault protection is required, and is identified by the QOB form factor to ensure proper compatibility with Square D QOB panels. This model is designed for use in installations that demand reliable GFCI protection without altering standard panel layouts, providing a compact, space‑saving solution that aligns with Square D’s line of bolt‑on, GFCI breakers. Ideal applications include branch circuits in compatible Square D panels where GFCI protection is mandated by code or specific outlet protection needs, while maintaining conventional overcurrent protection through its thermal‑magnetic mechanism.