Motor Circuit Protector, 4 A Amps, High Amp Trip Setting 49 A, Low Amp Trip Setting 21 A, Circuit Breaker Type High Interrupting Capacity, Number of Poles 3, Terminal Connection Plug-In, Trip Type Magnetic, Instantaneous Trip Adjustable, Circuit Breaker Mounting Style Bolt On Panelboard, Height 6.38 in, Width 3.19 in, Depth 4.57 in, Min. Wire Size 14 AWG, Max. Wire Size 1/0 AWG, Circuit Breaker Actuator Toggle, Max. Operating Temp. 158 Degrees F, Min. Operating Temp. -13 Degrees F