The Allen-Bradley 140U-K6D3-D20 Molded Case Circuit Breaker (MCCB) has a supply voltage rating of 480 Volts, an interrupting rate of 65 kA, a rated current of 200 Amps, and a 3-pole configuration and it is factory assembled. The internal control modules are factory installed and mounted in 2 different locations that are either the left side or right side. The modules mounted on the left side of the molded case circuit breakers include the Shunt Trip (SNT) and the Undervoltage Release (UVT) modules. On the right side of the circuit breaker, there are internal modules such as an Auxiliary Contact (AX), an Alarm Contact (AL) and an Auxiliary/ Alarm Contact (AX/AL) combination module. The 140U-K6D3-D20 Circuit Breaker that is manufactured by Allen-Bradley/Rockwell Automation conforms to international standards including the UL489, CSA22.2 (No.5), and IEC 60947-2 standards. It has also been accredited with international certifications such as the CCC, UL List, CSA, CSA, and CE Mark standards. It provides an option for current-limiting that offers a half-cycle interrupt to limit the let-through energy.

The main function of the Allen-Bradley 140U-K6D3-D20 Circuit Breaker is to protect the circuits against short-circuit, ground fault, and overload situations. It has an electronic trip unit rated at up to 400 Amps and it has an Ampere Interrupting Capacity (AIC) rating of 65 kA at 480 Volts. The K-Frame circuit breakers like this one have a maintenance mode that temporarily activates lower current trips during operations for instance inspection or maintenance processes. The MCCB will respond faster to a surge in the current like a low-level arcing fault, shortening the time that is needed to react and it allows energy to be present during these events. The circuit breaker has a maximum ambient temperature of 104 degrees Fahrenheit (40 degrees Celsius). The storage temperature range is from -40 to 176 degrees Fahrenheit (-40 to 80 degrees Celsius) and dimensions of 140 x 108.5 x 205 millimeters.