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Square D QOB120GFI bolt-on circuit breaker, grey plastic body, paddle actuator, compact rectangular form

SQUARE D

SQUARE D QOB120GFI Circuit Breaker 20A 1 Pole 120V AC

SKU CH-2Z9A-DX3CC

Ground-fault circuit interrupter rated 20 A at 120 V AC, single-pole bolt-on design for QO load centres and NQ panelboards, 10 kA interrupting capacity

  • Ground-fault protection for personnel safety with 20 A, 120 V AC rating
  • Bolt-on mounting fits QO and NQ load centres without tools
  • 10 kA interrupting capacity clears faults at 120 V AC
  • Compact 4.1 in by .8 in profile saves panel space
  • Pressure-plate terminals accept wire quickly for reliable connections

20 A QO Series GFCI Breaker

The Square D QOB120GFI is a single-pole miniature circuit breaker rated at 20 A and 120 V AC. It provides ground-fault protection for residential and light-commercial branch circuits. The unit bolts directly into compatible QO load centres and NQ panelboards. It is intended for installers who need a factory-new GFCI breaker for a QO-series enclosure.

Thermal and Electrical Behaviour

The breaker carries a maximum AIR rating of 10 kA at 120 V AC. It uses a paddle actuator for manual switching and reset after a fault trip. No DC voltage rating is assigned, so the device is limited to AC applications. Normal operation produces no audible noise and negligible heat rise within its 100 A frame size.

Bolt-On Mounting and Connections

The bolt-on mounting style secures the breaker to the panel bus without a plug-in stab. Pressure-plate terminals accept solid or stranded conductors without a separate lug kit. Physical dimensions are 4.1 in length, .8 in width and 2.9 in depth, fitting standard QO pole spacing. The breaker is not rated for DC circuits or panels outside the QO and NQ series.

Highlights

  • Ground-fault protection for personnel safety with 20 A, 120 V AC rating
  • Bolt-on mounting fits QO and NQ load centres without tools
  • 10 kA interrupting capacity clears faults at 120 V AC
  • Compact 4.1 in by .8 in profile saves panel space
  • Pressure-plate terminals accept wire quickly for reliable connections

Specifications

BrandSQUARE D

Questions about this item

How is the bolt-on QOB120GFI installed in a QO load center, and which step is most often missed?

Align the breaker's bolt-on foot with the panel rail, secure the mounting screw to the specified torque, then connect the load wire to the pressure-plate terminal and the neutral pigtail to the panel's neutral bar; the step most often missed is attaching the neutral pigtail, which is required for GFCI protection.

What maintenance or replacement will this 20 A GFCI breaker need over its service life?

Test the ground-fault function monthly using the built-in test button; replace the breaker if it fails to trip during test, trips repeatedly without a fault, or shows signs of overheating or physical damage.

What is the first limit reached when this breaker operates continuously at full load in a 120 V AC circuit?

The breaker is rated for continuous operation at 20 A with a 10 kA interrupting rating at 120 V AC; the first limit under sustained use is the thermal trip curve opening the circuit if current exceeds 20 A for the time defined by the curve.

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