Square D™ Square D™ Miniature Circuit Breaker, Molded Case Standard, 277/480Y VAC, 20 A, 50/60 Hz Frequency, 35 kA Interrupt, E Frame, Thermal Magnetic Trip, 270 to 875 A Trip, 3 Pole, 3 ph, Lug Connection, 12 to 6 AWG, 14 to 6 AWG Wire, Bolted-On Mounting, 104 deg F, 4.05 in L x 2.94 in W x 5.66 in H Dimensions