The 140U-KTL3-D40 Circuit Breaker is a 140U Molded Case Circuit Breaker manufactured by Allen Bradley/Rockwell Automation as a member of the 140U MCB product line. It comes with a K Frame size with a current rating of 400 Amps and a trip unit system. The Allen-Bradley 140U-KTL3-D40 circuit breaker has electronic protection with long, short high instant, and ground fault trip options. It is a three-pole circuit breaker with a current range of 4000 Amps. The 140U-KTH3-D40 Circuit Breaker by Allen-Bradley belongs to the bulletin 140U product line with interchangeable, short-time, long-time, and instantaneous trip functionalities that are rated for 400 Amps of current and that are best-suited for use with the K3H, K3L, K3G, K0L, K6H, K6L, K6G, K0G, and the K0H molded case circuit breaker frame sizes as well as with solid-state electronic trip units. This circuit breaker has an electronic magnetic trip adjustment range of 400 to 3200 Amps and a thermal trip adjustment range of 200 to 400 Amps.

The Allen-Bradley 140U MCB product line, including the 140U-KTL3-D40 Circuit Breaker and other K Frame devices comes with features such as rotary operators, field-installable internal control modules, flex cable operators, and molded case switches. Also, the 140U-KTL3-D40 Circuit Breaker features factory-installed or field-installed accessories and high interrupting ratings in compact dimensions. It is globally accepted and approved for universal applications around the world. The K Frame circuit breakers have a maximum current rating of 400 Amps with a current range of 100 to 400 Amps. They also have an interrupting rating of 40, 65, or 100 kiloamps at 380 to 415 Volts, 35, 65, or 100 kiloamps at 480 Volts, 25, 35, or 50 kiloamps at 600 Volts, and 10, 13, or 18 kiloamps at 690 Volts.