The Allen-Bradley 140U-JD6D3-C90 circuit breaker is a compact JD-frame circuit breaker from the 140U product line. It has an interrupting capacity/braking capacity range of 60 to 69 kiloamps at 480 Volts AC. The 140U-JD6D3-C90 circuit breaker is a three-pole circuit breaker with an integrated fixed thermal/adjustable magnetic trip unit. The Bulletin 140U breakers also support electronic trip units. The available options for the electronic units include the LSI, LSG, LS, and LSIG options. A higher level of customization is offered through electronic trip units, and the long time, short time, ground fault, and instantaneous trip settings can be finely tuned to suit the application requirements. The continuous current rating for the breaker is 90 Amps. The 140U-JD6D3-C90 circuit breaker can be used to protect electrical circuits, main or branch circuits, against abnormal circuit conditions such as overloads, ground faults, and short circuits. The 140U-JD6D3-C90 circuit breaker is approved by global certification agencies including the CE and CCC standards.

Failure to clean, inspect, and maintain molded case circuit breakers such as the 140U-JD6D3-C90 circuit breaker can lead to a reduced operational lifespan and it can also cause the breaker to not operate properly under fault conditions. This can potentially lead to user injury or even death and also to severe equipment damage. The inspection and maintenance of circuit breakers like this one should only be performed by technicians who are familiar with the hazards associated with high voltage/high current electrical systems. Furthermore, the technicians should be familiar with the specifics of the 140U circuit breaker product line. To minimize the risk of injury and damage to equipment, the main electrical supply to the electrical system which contains the 140U-JD6D3-C90 circuit breaker as a component, should be switched off.