The Allen-Bradley 140U-M6L3-D80 circuit breaker is an M-frame molded case circuit breaker and it forms part of the 140U product range. It comes with an Electronic (LS) trip module (the "LS" stands for long-time and short-time). The long-time feature allows for the adjustment of the thermal rating, which can be set between 1.05x and 1.3x the thermal rating. The short time feature allows for the adjustment of the short time between the thermal and short-circuit rating. Electronic tip modules for the 140U series breakers can support between 70 and 1200 Amps continuous current ratings. The 140U series breakers can also be ordered with thermal-magnetic trip modules rated for 15 to 800 Amps. At 480 Volts AC, the rated braking capacity/interrupting rating for the 140U-M6L3-D80 circuit breaker is 60 to 69 kiloamps.

The 140U-M6L3-D80 circuit breaker is a 3-pole breaker with an 800 Amps current rating. The thermal trip can be set to anywhere between 200 and 800 Amps. At 60 Hertz input frequency, the interrupting capacity ratings for the 140U-M6L3-D80 circuit breaker are 100 kiloamps at 240 Volts AC, 65 kiloamps at 480 Volts AC, and 25 kiloamps at 600 Volts AC. At 50 Hertz input frequency, the service breaking capacity specifications for the 140U-M6L3-D80 are 100 kiloamps at 220 Volts AC, 70 kiloamps at 380 Volts AC, 50 kiloamps at 500 volts AC, and 13 kiloamps at 690 Volts AC. Agency approvals for the 140U-M6L3-D80 circuit breaker include the CE, UL 489, CSA, and KEMA – KEUR ratings. Only experienced technicians with the right training should undertake the installation and maintenance of systems where the 140U-M6L3-D80 circuit breaker is used.