The Square D “QO” line of miniature circuit breakers is their best-known product line. These “Qwik-Open” or QO breakers are the fastest opening breakers in use in the industry. … These breakers feature a visual trip indicator and make it easy to quickly spot the tripped breaker in the panel.

What happened to Square D breakers?

In 1935 Square D began producing its own range of circuit breakers for both commercial and residential uses. In 1991, the company was acquired and became a subsidiary of Schneider Electric.

Can Square D breakers be double tapped?

The only manufacturers that make circuit breakers that are designed to hold two conductors are Square D and Cutler-Hammer, but not all of their circuit breakers can be double-tapped. … Loose conductors can lead to overheating, arcing, and possibly a fire.