Manufactured by Eaton Cutler-Hammer, the 140G-K3F3-D40 molded case circuit breaker is part of the 140G circuit breakers series. This module runs on a voltage rating of 600 Volts AC, with a current rating of 400 Amps. The 140G-K3F3-D40 circuit breaker comes in a K size frame and it also features bolt-on connection, 3 poles, and 3 operating phases. It comes with the adjustable thermal-magnetic protection type and has the li–long-time and instantaneous options. The AIC rating of this circuit breaker is 35 kA at 480 Volts AC. The 140G-K3F3-D40 molded case circuit breaker features a wide range of fault disruption ratings from 25 to 200 kA that provides for a variety of applications. The 140G circuit breakers are available in many sizes and different current ratings ranging from 16 to 3000 Amps and they come with the most common frames types as well as the standard accessories that make them easy to use.

As with the other 140G molded case circuit breakers, the Allen-Bradley 140G-K3F3-D40 circuit breaker provides thermal protection for overcurrent and short-circuit situations. These devices are also designed to offer thermal protection through mechanical means by using the heater elements or electronics that aid in detecting the current flow and then modeling the heat generated by the current. These circuit breakers are made to be available to help in the quick and easy configuration of nearly any type of application project. They can be accessed with the AC and DC thermal-magnetic protection and the AC electronic protection to match a wide range of installation requirements. Besides, they are universally accepted and approved for UL and IEC related projects.