The Allen-Bradley 140UE-JTF3-D20 circuit breaker is a circuit breaker by Allen-Bradley, and it has been designed for industrial motor protection. The 140UE-JTF3-D20 circuit breaker is part of the Allen-Bradley/Rockwell Automation 140UE series, and it is a molded case circuit breaker that employs fixed magnetic and adjustable thermal mechanisms to protect industrial motors. That means these two mechanisms receive a current flow depending on the conditions and quality of the current, and the 140UE-JTF3-D20 circuit breaker will react and prevent current from flowing to the industrial motor. During the installation, both mechanical and electrical operational tests must be done to make sure that the 140UE-JTF3-D20 circuit breaker can operate flawlessly and that it can also offer the required level of protection. The 140UE-JTF3-D20 circuit breaker can be installed in a cabinet and then placed in a strategic area to allow it to operate optimally.

The 140UE-JTF3-D20 circuit breaker provides a number of protection functions, including disconnection for the motor-branch circuit, branch-circuit protection, short-circuit protection, switching functions, and overload protection. The 140UE-JTF3-D20 circuit breaker can operate at a maximum temperature of 75 degrees Celsius, therefore, it is recommended to use copper or aluminum wiring rated for 75 degrees Celsius and above and that can handle frequent operations at the maximum specified temperature. Before making the final decision to buy the 140UE-JTF3-D20 circuit breaker, the host motor must be inspected to ensure that the two devices are compatible and that they will operate together without any problem. The 140UE-JTF3-D20 circuit breaker is important for any industrial motor since it can reduce the risk of faults and accidents that can be caused by the unstable current.