The 140U-K-FCX06 mechanism is a non-metallic flex cable operating mechanism manufactured by Allen-Bradley/Rockwell Automation as part of the Allen-Bradley bulletin 140U product line. It features a K Frame size, a NEMA Type 1, 3, 4, 4X, and Type 12 enclosure, and a 6-foot cable length. The 140U-K-FCX06 mechanism includes 6 feet of flexible cable and a flange-mounted thermal plastic handle, and it is designed for use with the 140U molded case circuit breakers. The Frame K modules have a current rating of 400 Amps. The 140U MCB series devices come with a current range of 15 to 1200 Amps with an electronic current rating of 70 to 1200 Amps, a thermal-magnetic current rating of 15 to 800 Amps, and molded case switches rated at 125 to 1200 Amps. These circuit breakers are globally rated and approved for global use by the UL 489, IEC 60947-2, and CSA 22.2 No. 5 standards.

The Allen-Bradley 140U-K-FCX06 mechanism has different operating mechanisms, including flex cable and rotary variable-depth operating mechanisms. It also features a high interrupting rating in compact dimensions. The electronic current rating options include options such as long time or short time settings, long time or short time or high instantaneous settings, long time or short time or ground fault settings, and long time or short time or high instantaneous or ground fault settings. Other features of the 140U-K-FCX06 flex-cable operating mechanism circuit breaker are molded case switches, flex cable operators, rotary operators, and a field-installed internal control module. They have an interrupting rating of 65 kiloamps at 380 to 415 Volts, 65 kiloamps at 480 Volts, 35 kiloamps at 600 Volts, and 13 kiloamps at 690 Volts.