The 140U-K-RMX Rotary Handle Mechanism manufactured by Allen-Bradley/Rockwell Automation as part of the 140U MCB series. This unit has a K-Frame size and it is installed with the NEMA Type 1, 3, 4, 4X, 12 enclosures. This module is part of the IEC series of molded case circuit breakers with a flange-mounting thermal plastic handle. It is designed for use with the 140U MCB circuit breakers and the K Frame breakers which come with a current rating of 400 Amps. The 140U-K-RMX Rotary Handle Mechanism and all the 140U MCB series devices come with a current rating 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 a molded case switch current of 125 to 1200 Amps. They are also globally accepted and approved for use with universal applications. These circuit breakers are also listed for compliance with the UL 489, IEC 60947-2, and CSA 22.2 No. 5 standards.

The Allen-Bradley 140U-K-RMX Rotary Handle Mechanism has unique operating mechanisms such as the flex cable and rotary variable-depth operating mechanisms. Additionally, it also comes with a high interrupting rating that is contained 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-RMX Rotary Handle Mechanism and circuit breaker it is compatible with include molded case switches, a field-installed internal control module flex cable operators, and rotary operators. They have an interrupting rating of 65 kiloamps at 380 to 415 Volts, 35 kiloamps at 600 Volts, 65 kiloamps at 480 Volts, and 13 kiloamps at 690 Volts.