The Allen-Bradley/Rockwell Automation 140G-J0X3 circuit breaker is a 250 Amps circuit breaker. This breaker only features a frame and it has a breaking capacity of 100 kiloAmps at 480 Volts AC. Although the 140G-J0X3 circuit breaker does not feature a trip unit, it can support a thermal-magnetic trip unit. With the breaker’s frame having a current rating of 250 Amps, it is capable of supporting a thermal trip that can withstand a current of between 175 Amps and 250 Amps. Its magnetic trip, on the other hand, can comfortably handle a current ranging from a minimum of 1250 Amps to a maximum of 2500 Amps.

The Allen-Bradley 140G-J0X3 circuit breaker supports the field installation of its trip unit. However, the installation of the trip unit should be performed by a technician who is an expert on circuit breakers and their functionalities. Additionally, all the application requirements should be known before calibrating the trip unit. To avoid injury to the users, adding the trip unit and connections to the 140G-J0X3 circuit breaker should be done after the system power has been disconnected. The breaker’s operating temperature stands at 40 degrees Celsius while its operating humidity is between 5 and 95% without condensation. The 140G-J0X3 circuit breaker belongs to the Allen-Bradley 140G series. Breakers in this family are designed to conserve space, making them easy to mount. Additionally, the 140G-J0X3 circuit breaker, like other molded case circuit breakers in the same family, is approved for global use with its interrupting or breaking capacity rated by international standards such as the CSA, UL, IEC, and CCC.