QO and QOB one, two and three pole thermal magnetic circuit breakers provide overcurrent protection and switching on ac and dc systems. These circuit breakers have an over center, trip-free toggle mechanism with quick-make, quick break action and positive handle indication A full line of factory installed accessories, such as shunt trips, auxiliary switches and alarm switches, is also available This handle tie converts any two adjacent 120/240 VAC, 1P side by side QOT circuit breakers to independent trip 2P.