The 140U-L3D3-D25 Circuit Breaker is an Allen Bradley/Rockwell Automation Molded Case Circuit Breaker manufactured as part of the 140U MCB product line. It comes with an L Frame with a current rating of 600 Amps. The circuit breaker has an interrupting rating or breaking capacity of 30 to 39 kiloamps at 480 Volts. The Allen-Bradley 140U-L3D3-D25 Circuit Breaker has fixed thermal and adjustable magnetic protection with a breaking capacity or interrupting rating of 45 kiloamps at 400 Volts and 35 kiloamps at 480 Volts. These are the interrupting ratings at a thermal trip and an operational current rating of 250 Amps with an overall current rating of 2500 Amps. The L Frame size circuit breakers have an interrupting rating of 45 to 70 kiloamps at 380 to 415 Volts, 35 to 65 kiloamps at 480 Volts, 25 to 35 kiloamps at 600 Volts, and 20 to 25 kiloamps at 690 Volts.

Some of the notable features of the Allen-Bradley 140U-L3D3-D25 Circuit Breaker include field-installed internal control modules, rotary operators, flex cable operators, and molded case switches. It has high interrupting ratings in compact dimensions and it is globally accepted and rated for compliance with the UL, CSA, IEC, KEMA-KEUR, and CE standards, which means that it can be universally used in applications around the world. Generally, the Bulletin 140U molded case circuit breakers like the 140U-L3D3-D25 Circuit Breaker are rated for 15 to 1200 Amps of current with a thermal-magnetic current range of 15 to 800 Amps, and an electronic current range of 70 to 1200 Amps with 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, short time, high instantaneous, and ground fault settings.