Square D, QO240GFI, Miniature Circuit Breaker, Class A Ground Fault, 120/240 V AC, 40 A, 50/60 Hz Frequency, 10 kA Interrupt, QO Frame, Thermal Magnetic Trip, 2 Pole, 1 ph, Box Lug Connection, 14 to 6 AWG, 12 to 4 AWG Wire, Plug-On Mounting, 40 deg C, 2.91 in L x 1.5 in W x 4.12 in H Dimensions