Square D QOB-GFI QO 2-Pole Bolt-On Circuit Breaker, Ground Fault Class A

Square D QOB-GFI QO 2-Pole Bolt-On Circuit Breaker, Ground Fault Class A

The Square D QO 2-Pole Bolt-On Circuit Breaker (QOB-GFI) delivers thermal magnetic overcurrent protection for ac and dc systems, paired with integrated Class A ground fault sensing at a 6mA trip sensitivity for enhanced personnel safety. This QO Series breaker is available across a Motor FLA range of 15A, 20A, 30A, 40A, 50A, and 60A, so installers can select the amperage that matches the branch circuit while relying on the same 120/240 VAC voltage rating, 10kA interrupt rating, bolt-on mount, and pigtail lead connection across every option. An over-center, trip-free toggle mechanism provides quick-make, quick-break switching action for dependable operation. Designed for QO-compatible panelboards, this breaker is TAA compliant and built to Green Premium standards by Schneider Electric.

Key Features

• Amperage Range: Available in 15A, 20A, 30A, 40A, 50A, and 60A Motor FLA options to match branch circuit requirements.
• Configuration: 2-Pole design for balanced circuit protection.
• Ground Fault Protection: Class A ground fault sensing at 6mA trip level for enhanced personnel safety.
• Voltage Rating: 120/240 VAC operational voltage across all amperage options.
• Interrupt Rating: 10kA short-circuit interrupt capacity.
• Mounting: Bolt-on mount for secure attachment to QO-compatible panelboards.
• Wiring: Pigtail lead connection for panelboard installation.
• Wire Range: AWG 14...AWG 6 copper, AWG 12...AWG 4 aluminum; tightening torque 4.6-4.6 N.m (AWG 12...AWG 4) / 5-5 N.m.
• Mechanism: Over-center, trip-free toggle with quick-make, quick-break switching action.

Certifications & Compliance

• UL Listed
• CSA
• TAA Compliant

Technical Specifications

• Series: QO
• Standards: CSA
• Motor FLA Options: 15A, 20A, 30A, 40A, 50A, 60A
• Voltage Rating: 120/240 VAC
• Interrupt Rating: 10kA
• Ground Fault Sensitivity: 6mA, Class A

Typical Applications

• Residential and Light Commercial Load Centers
• Branch Circuit Ground Fault Protection
• QO Panelboard Upgrades and Replacements
• Renovation and New Construction Electrical Panels
• Motor and Equipment Branch Circuits Requiring Ground Fault Sensing

Why Square D?

Manufactured by Schneider Electric, this QO Series breaker is UL Listed and CSA certified, meeting Green Premium standards for reliable, code-compliant protection in professional electrical installations. With a consistent 120/240 VAC rating, 10kA interrupt capacity, and Class A ground fault sensing across the full 15A-60A Motor FLA range, it offers installers a dependable, panel-matched solution for bolt-on QO panelboards.