The 140UE-M5D3-D80 Circuit Breaker is an IEC Molded Case Circuit Breaker manufactured by Allen-Bradley/Rockwell Automation as part of the 140U MCB series. It has Frame M frame size with a current rating of 800 Amps, and at 400 Volts AC, this circuit breaker has an interrupting rating or breaking capacity of 50 to 59 kiloamps. This breaker is a three-pole breaker with fixed thermal and adjustable magnetic trip units. The 140UE-M5D3-D80 circuit breaker has a current range of 300 to 800 Amps. Circuit breakers in this series come with various operational features, including a thermal-magnetic current range of 15 to 800 Amps, an electronic current range of 70 to 1250 Amps, and a molded case switch current rating of 160 to1250 Amps. Other features include rotary variable-depth operating mechanisms, flex cable operating mechanisms, and field or factory-installed accessories.

The Allen-Bradley 140UE-M5D3-D80 Molded Case Circuit Breaker has both internal and external accessories. Some of the external accessories of the breaker include a padlock-able hasp, phase barriers, terminal covers, and a slide bar interlock as well as flex-cable and variable depth rotary operating mechanisms. The internal accessories of the 140UE-M5D3-D80 Circuit Breaker are the under-voltage release, shunt trip, auxiliary and alarm combination, auxiliary shields, and the alarm (trip) contacts. Additionally, it is approved by the CE, IEC 60947-2, and KEMA-KEUR standards. At 50 Hertz and 800 Amps, the circuit breakers with Frame M frames like this one have a breaking capacity of 65 kiloamps at 220 to 240 Volts AC, 50 kiloamps at 380 to 415 Volts AC, 25 kiloamps at 500 Volts AC, and 20/10 kiloamps at 690 Volts AC. At 60 Hertz and 800 Amps, the 140UE-M5D3-D80 circuit breaker has an interrupting rating of 65 kiloamps at 240 Volts AC, 50 kiloamps at 480 Volts AC, and 25 kiloamps at 600 Volts AC.