Stab-lok breakers are fully interchangeable with all past breakers and deliver the same proven quality. The unique Stab-lok breaker design of only a 1/2" thick per pole, allows for the reduction of the size and weight of the loadcentre. This breaker will work only in Federal Pioneer Stab-lok branded residential panels. Typical application for a single pole 20 Amp breaker include kitchen counter outlets circuits with GFCI protection and requiring a wire size of 12-2.