Square D, QO320, Miniature Circuit Breaker, Standard, 240 V AC, 20 A, 60 Hz Frequency, 10 kA Interrupt, QO Frame, Thermal Magnetic Trip, 3 Pole, 3 ph, Toggle Actuator, Pressure Plate Connection, 14 to 8 AWG Wire, Plug-In Mounting, 40 deg C, 2.91 in L x 2.25 in W x 3 in H Dimensions