Question: what is the difference between qt and qp breakers?
Answer: Type QT breakers are the duplex, triplex, and quadplex version of the QP. They provide space savings inside the enclosure by delivering two 1/2" breakers in 1" of space. ... These space saver triplex breakers provide a 2 pole common trip breaker for 120/240V AC circuits and two single poles for 120V AC circuits.