Square D QOB120GFI2100 20A 1-Pole 120 V Circuit Breaker

The Square D QOB120GFI2100 is a compact, safety-focused circuit breaker built for reliable 120-volt service. With a 20 A current rating and 1 pole, this GFI/GFCI-enabled unit delivers essential ground-fault protection on a single branch circuit, helping to minimize electric shock risk in wet or damp areas while keeping your panel streamlined.

Key specifications

• Part Number: QOB120GFI2100
• Current rating: 20 A
• Poles: 1
• Voltage rating: 120 V
• Type: GFCI-enabled circuit breaker (GFI)

Why this matters

• Ground-fault interruption on a single 120V circuit. The built-in GFI protection helps reduce the risk of electric shock where water and electricity meet, such as bathrooms, kitchens, and outdoor outlets.
• Dedicated 20A protection. Ideal for circuits that require a higher load, like outlets serving portable appliances or lighting on dedicated 120V branches.
• Trusted Square D reliability. Part of a proven family of breakers designed for compatibility with Square D panels and standard installations.
• Simplified replacement. Use the exact QOB120GFI2100 part number for a straightforward swap in compatible panels, minimizing downtime during upgrades or servicing.

Ideal use cases

• Bathrooms and powder rooms where splash exposure necessitates GFCI protection for receptacles and lighting circuits.
• Kitchens with outlets on small-appliance circuits that benefit from ground-fault protection.
• Outdoor or garage circuits where moisture exposure increases shock risk.
• Renovations or new installations in residential panels that require a single-pole, 120V solution with GFI capability.

Installation and maintenance tips

• Turn off the main power before installing or replacing to ensure safe handling.
• Verify the panel is compatible with QOB-series breakers to ensure proper fit and function.
• After installation, use the breaker’s built-in test function (where available) to confirm GFI operation. Regularly test to maintain ground-fault protection over time.
• Label the circuit clearly in your panel to indicate GFI protection and intended usage areas (bathrooms, kitchens, outdoor outlets, etc.).

For reliable 120 V circuit protection with dedicated 20A capacity, the Square D QOB120GFI2100 stands out as a precise, purpose-built choice. It combines essential ground-fault safety with straightforward installation, making it a practical upgrade for residential panels that demand dependable GFI protection.