Square D QO and QOB Circuit Breakers

October 8, 2026

Reliable, durable QO breakers: Superior circuit protection that’s still going strong

Featuring Qwik-Open (QO) technology, QO are the fastest opening breakers in the industry and trip within 1/60th of a second.  Easily spot a tripped breaker with the Visi-Trip indicator, helping homeowners know when to call a professional.

QO breakers come in single-pole, double-pole, and 3-pole breaker options – all ¾-inch in size to save wire. Securely fasten circuit breakers to the panel bus with the QOB bolt-on option.

Stay ahead of the competition with contractors first choice in electrical protection using Square D QO breakers – reliable, easy to install, and backed by a warranty.

Product specifications

Plug-On circuit breakers:

  • UL listed
  • 120/240 Vac
  • 10k AIR

CAFI breakers:

  • UL listed, CSA approved
  • 120/240 Vac
  • 10k AIR
  • White reset button

GFCI breakers:

  • UL listed
  • 10k AIR

Dual function breakers:

  • UL listed, CSA approved
  • 120 VAC
  • 15-20 A current rating
  • Purple reset button
More Information

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