Square D, QO350, Miniature Circuit Breaker, Standard, 240 VAC, 50 A, 50/60 Hz Frequency, 10 kA Interrupt, QO Frame, Thermal/Magnetic Trip, 3 Pole, 3 ph, Box Lug Connection, 8 to 2 AWG Wire, Plug-In Mounting, 40 deg C, 2.91 in L x 2.25 in W x 3.12 in H Dimensions