The 140G-R12I3-E20 3-pole molded case circuit breaker is an R-frame high-performance circuit breaker made by Allen-Bradley that is designed to provide circuits and connected equipment with protection from general overcurrents, short circuits, and thermal overcurrents. This R-frame circuit breaker can also serve as as the main disconnecting means for a control panel, and it comes with a high-precision electronic trip unit that allows for customization of protection curves for specific application needs. The 140G-R12I3-E20 circuit breaker has a rated short-circuit breaking capacity of 125 Kilo-Amps at 480 Volts 3-phase input (50/60 Hertz). It has a continuous current rating of 2000 Amps and a rated insulation voltage of 1000 Volts AC. 

The 140G-R12I3-E20 circuit breaker has a life-time mechanical operation of 15000 at 60 operations per hour, and an electrical life-time of 60 operations per hour. This circuit breaker has an electronic type of trip unit with long, short, instantaneous, and ground fault trip ranges. It has a long trip range of 800 to 2000 Amps and a short trip range of 1200 to 20,000 Amps between 0.1 and 10 seconds of trip time. It also has a trip range of 3000 to 30000, and a ground fault trip range of 400 to 2000 Amps for 0.2 to 0.8 seconds duration. The 140G-R12I3-E20 circuit breaker, like all R Series circuit breakers, is designed for harsh and tough environmental conditions, and it supports a wide range of mounting orientations. It has an operating temperature limit of 40 degrees Celsius and can be stored at a temperature range of -40 to 80 degrees Celsius. The 140G-R12I3-E20 circuit breaker has total mounting dimensions of 427 x 282 x 382 millimeters and it weighs approximately 79.0 kilograms.