Square D QOB120GFI 20A GFCI Circuit Breaker

Overview

The QOB120GFI is a 1-pole, 20-amp GFCI breaker from Square D’s QO series, designed for 120V AC single-phase systems. It provides Class A ground fault protection with a sensitivity of 6mA, making it ideal for areas where electrical safety is critical, such as kitchens, bathrooms, and outdoor circuits.

Key Specifications

• Amperage Rating: 20A

• Voltage Rating: 120V AC

• Number of Poles: 1

• Interrupting Capacity: 10,000 AIC at 120V

• Trip Mechanism: Thermal-magnetic

• Mounting Type: Bolt-on (compatible with QO load centers and NQ panelboards)

• Wire Size Compatibility:

  • Copper: 14–8 AWG

  • Aluminum: 12–8 AWG

• Dimensions:

  • Height: 4.12 inches

  • Width: 0.75 inches

  • Depth: 2.91 inches

• Certifications: UL Listed, CSA Certified

• Operating Temperature: Up to 40°C (104°F)

• Diagnostic Feature: VisiTrip® indicator for visible trip status

Benefits

• Enhanced Safety: Provides ground fault protection to prevent electrical shock hazards.

• High Interrupting Capacity: Withstands up to 10,000 amperes of fault current, ensuring reliable protection.

• Thermal-Magnetic Protection: Offers both long-time and instantaneous overload protection.

• Easy Installation: Bolt-on design ensures secure and straightforward installation in compatible load centers.

• Diagnostic Clarity: VisiTrip® indicator allows for quick identification of tripped breakers, simplifying maintenance and troubleshooting.

Typical Applications

• Residential Kitchens and Bathrooms: Protects circuits supplying outlets in areas where ground fault protection is required.

• Outdoor Circuits: Safeguards circuits exposed to moisture, such as those powering outdoor lighting or receptacles.

• Workshops and Garages: Provides protection for circuits supplying power tools and equipment in areas where ground faults are a concern.