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White plastic miniature circuit breaker with a black paddle actuator, bolt-on mounting, compact rectangular form, smooth matte finish

SQUARE D

SQUARE D QOB120CAFI Miniature Circuit Breaker 20A 1 Pole

SKU CH-NGG2-3JERS

Miniature arc-fault breaker rated 20 A, 120/240 V AC, single-pole bolt-on for QO load centres, 10 kA interrupting, 4.8 × .8 × 2.9 in

  • Arc-fault protection for safer circuits
  • 20 A rating suits standard branch circuits
  • Bolt-on mounting fits QO load centres
  • 10 kA interrupting capacity handles faults
  • Compact 4.8 in length saves panel space

SQUARE D QOB120CAFI 20 A Arc Fault Breaker

The SQUARE D QOB120CAFI is a miniature circuit breaker rated 20 A for single-phase 120/240 V AC systems. It provides arc fault circuit interrupter protection and mounts by bolt-on connection into compatible QO load centres or NQ panelboards. The one-pole unit has a 10 kA interrupting rating at the rated voltage.

Suits QO panels needing arc fault protection

Electricians fitting QO or NQ panels who require arc fault detection on a 20 A branch circuit will use this breaker. The paddle actuator and pressure-plate terminals simplify installation in the 100 A frame size. Installers working with panels outside the QO series or needing a different amperage must select another device.

10 kA AIR at 120/240 V AC

The maximum ampere interrupting rating is 10 kA at 120/240 V AC, confirming the breaker can safely clear fault currents up to that level in the listed panels. The DC voltage rating is not rated, so the device is unsuitable for DC applications. Verify the panel series and available fault current before specifying.

How it compares

Measured against everything we stock in Breakers & Circuit Protection, at today’s prices. Recalculated every night.

Price $159.99
Pricier than about 79% of the 1,135 comparable items (median $54.99).

Specifications

Product
Brand nameSQUARE D

Questions about this item

Will the QOB120CAFI bolt on to the existing QO load centre I already have?

Yes, the breaker uses a bolt-on mounting style and is listed for use with QO load centres and NQ panelboards, so it fits directly onto the bus bars of those panels.

How can I confirm the arc fault protection is active once the breaker is installed?

After installation, press the built-in test button; the paddle should trip to the centre position, indicating the arc fault detection circuit is functioning.

Does the package include the pressure-plate terminal screws or must I supply them?

The breaker ships with the pressure-plate terminals already assembled, so no separate terminal hardware is required for standard copper conductors.

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