The 140U-L6D3-D60 circuit breaker is a 140U molded case circuit breaker manufactured by Allen-Bradley/Rockwell Automation as part of the 140U MCB series. This circuit breaker has an L-Frame size with a current rating of 600 Amps and a breaking capacity or interrupting rating of 60 to 69 kiloamps at a voltage rating of 480 Volts. It features the fixed thermal and adjustable magnetic protection types. The 140U-L6D3-D60 circuit breaker is a three-pole circuit breaker with a current range of 600 Amps. The unit also has a breaking capacity or interrupting rating of 70 kiloamps at 400 Volts and of 65 kiloamps at 480 Volts. Some of the main features of these circuit breakers include flex cable operating mechanisms and rotary variable-depth operations. It also has factory-installed or field-installed accessories. The bulletin 140U product line is universally accepted and approved for use with applications across the world.

The 140U molded case circuit breakers, including the 140U-L6D3-D60 circuit breaker, have a current rating ranging from 15 to 1200 Amps with options including a thermal-magnetic current of 15 to 800 Amps, a molded case switch current of 125 to 1200 Amps and an electronic current of 70 to1200 Amps. The module is well-matched with long-short time, long-short time-instantaneous, long-short time-ground fault, and long-short-instantaneous-ground fault functions. The Allen-Bradley 140U-L6D3-D60 circuit breaker, like other 140U MCB circuit breakers, is approved and listed for compliance with the CSA, CE, UL, IEC, and KEMA-KEUR standards. They feature internal control modules that are field-installed, rotary, and flex cable operators, and molded case switches. This unit has a maximum current rating of 600 Amps and an operating current range of 300 to 600 Amps.