The 140U-KTH3-D40 Circuit Breaker is a 140U Molded Case Circuit Breaker manufactured by Allen-Bradley/Rockwell Automation. This circuit breaker has a K Frame and a current rating of 400 Amps with a trip unit system. It also comes with three poles and electronic long, short, and high instantaneous protection. The 140U-KTH3-D40 Circuit Breaker has a current range of 4000 Amps. Other notable features of this circuit breaker include an electronic thermal trip adjustment range of 200 to 400 Amps and a magnetic trip adjustment range of 400 to 3200 Amps at an operational current of 400 Amps. The Allen-Bradley 140U-KTH3-D40 Circuit Breaker belongs to the Bulletin 140U product line, and it has an interchangeable trip with the Long-Time, Short-Time, and Instantaneous trip functions. It is rated for 400 Amps and it is suitable for use with the frame types and the K3H, K3L, K3G, K6G, K6H, K0L, K0G K6L, and K0H molded case circuit breakers. These circuit breakers also feature solid-state electronic trip units.

The Allen-Bradley 140U-KTH3-D40 Molded Case Circuit Breaker comes with a wide range of features, some of which include factory-installed or field-installed accessories, flex cable operating mechanisms, rotary variable-depth operating mechanisms, and high interrupting ratings in compact dimensions. Additionally, the 140U MCB circuit breakers, including 140U-KTH3-D40 Circuit Breaker, are globally rated and approved for use with worldwide applications. The K Frame circuit breakers in the Bulletin 140U product line have interrupting ratings of 40, 65, or 100 kiloamps at 380 to 415 Volts, 35, 65, or 100 kiloamps at 480 Volts, 25, 35, or 50 kiloamps and 10, 13, or 18 kiloamps at 690 Volts.