Square D™ Miniature Circuit Breaker, Molded Case Standard, 277/480Y VAC, 100 A, 50/60 Hz, 18 kA Interrupt, E Frame, Thermal/Magnetic Trip, 1000 to 2300 A Trip, 3 Pole, 3 ph, Lug, 12 to 2 AWG, 14 to 2/0 AWG Wire, Bolt-On Mount, 104 deg F, 4.05 in L x 2.94 in W x 5.66 in H