Square D EDB34020 Miniature Circuit Breaker Brand: Square D. Part Number: EDB34020. Square D Miniature Circuit Breaker, 277/480 VAC, 20 A, 50/60 Hz Frequency, 18 kA Interrupt, EDB Frame, Thermal/Magnetic Trip, 270 to 875 A Trip, 3 Pole, 3 ph, Lug Connection, 14 to 6 AWG, 12 to 6 AWG Wire, Bolted-On Mounting, 40 deg C, 5.66 in H x 2.94 in W x 4.05 in D Dimensions. Additional Description: SQD -EDB34020 MINIATURE CIRCUIT BREAKER 480Y/277V 20A. Catalog Description: Mini circuit breaker, E-Frame, 20A, 3 pole, 480Y/277VAC, 25kA max, bolt on [TAA]..