The Allen-Bradley/Rockwell Automation 140G-JTF3-D15 circuit breaker is a trip unit thermal-magnetic circuit breaker. It has been included in the Allen-Bradley 140 series and it comes with 3 poles. Its design has been included in the J frame branch of the 140 series and it employs trip units to perform detections and interrupting actions. This breaker has a frequency range of 50 to 60 Hertz, and an approximate voltage rating of 220 to 500 Volts AC. It is a powerful breaker that can be used as a panel circuit breaker, a unit circuit breaker, or even in a whole system. The main function of the 140G-JTF3-D15 trip unit thermal-magnetic circuit breaker is to stop current flow when any anomalies have been detected that have the ability to cause further damages to the whole system, including the equipment attached to it.

There is a wide range of accessories available for the Allen-Bradley/Rockwell Automation 140G-JTF3-D15 trip unit thermal-magnetic circuit breaker. These accessories include enclosures and poles, auxiliary contacts, alarms, and housings to cables. These accessories have also been produced by Allen-Bradley/Rockwell Automation and their main purpose is to help to improve the performance of the circuit breaker. The 140G-JTF3-D15 trip unit thermal-magnetic circuit breaker can be exposed to extreme temperatures, although it is likely that the breaker will not have the same efficiency at very high or very low temperatures. When operating below 0 degrees Celsius, it is possible for ice to form around the housing of the drive. The Allen-Bradley/Rockwell Automation 140G-JTF3-D15 trip unit thermal-magnetic circuit breaker has a height, width, and depth of 160, 105, and 140 millimeters, respectively.