The Allen-Bradley/Rockwell Automation 140U-K0D3-D25 circuit breaker is a K-frame molded-case circuit breaker that comes with two detection mechanisms that consist of a thermal and magnetic trip, more specifically of a fixed thermal trip and adjustable magnetic trip. This breaker has been designed to detect higher or lower levels of current than normal and to perform an interrupting action when these currents are detected. The main reason why the Allen-Bradley/Rockwell Automation 140U-K0D3-D25 K-frame molded-case circuit breaker is used is that some circuits and equipment require protection against these faults. It is important to mention that unlike fuses, circuit breakers are long-term devices that can be used non-stop as long as each detected condition is cleared and corrected. This means the breaker can be set back into operation almost immediately.

The Allen-Bradley/Rockwell Automation 140U-K0D3-D25 K-frame molded-case circuit breaker has a current rating of 400 Amps and different interrupting ratings that vary according to the voltage used. For example, the interrupting rating is 200 kA at 240 Volts and it is 50 kA at 600 Volts. The Allen-Bradley/Rockwell Automation 140U-K0D3-D25 K-frame molded-case circuit breaker has three poles that are in charge of performing the interrupting action in the breaker. It can be mounted in any position and it is recommended to enclose the breaker if the kind of environment it is used in requires it. Once the breaker has been proven to be compatible with the motor and different equipment that it will be used with, the environmental conditions of the installation environment need to be checked so that the breaker can operate in optimum conditions. There is a whole accessories catalog for this breaker, and these accessories help to enhance the breaker's operations and installation.