Cutler-Hammer Circuit Breaker, Type BR, 120/240 V, 100 A, 50/60 Hz Operating Frequency, 1 ph, 2 Pole, 42 kA Interrupt, Quick-Make, Quick-Break Actuator, 4 – 1/0 AWG Wire, Plug Mounting, Dimensions: 6 in L x 4 in W x 2-1/4 in H, 60 to 75 deg C Operating, Suitable for: Protecting the Wires in Home from Overheating and Fault CurrentsWire Size #4-1/010kA interrupting current rating1 inch space, CSA/UL Listed