Square D, QO240, 2-Pole Miniature Circuit Breaker, Standard, 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, 8 to 2 AWG Wire, Plug-On Mounting, 40 deg C, 3 in H x 1.5 in W x 2.91 in D Dimensions