The Allen-Bradley 140U-K0D3-D12 circuit breaker is a K-frame circuit breaker that has been designed to protect any industrial process that uses electrical circuits and different kinds of connections between all the pieces of equipment that are involved. This breaker has been designed by Allen-Bradley/Rockwell Automation and it consists of a device with switching capabilities. This circuit breaker is composed of different elements, but the most important is its trip and its group of 3 poles. The Allen-Bradley 140U-K0D3-D12 K-frame circuit breaker comes with a thermal and magnetic trip mechanism that detects a different kind of current and in different ways. The trip mechanism is in charge of detecting current whereas the 3 poles are in charge of performing the action that will stop the abnormal current from entering the circuit.

The Allen-Bradley 140U-K0D3-D12 K-frame circuit breaker has a current rating of 400 Amps and a breaking capacity of 100 Amps at 400 and 480 Volts. The interrupting rating of the circuit breaker depends on the voltage that is applied, for example, at a voltage of 200 Volts, the breaker has an interrupting rating of 200 kA and at a voltage of 600 Volts, the breaker has an interrupting rating of 50 kA. The Allen-Bradley 140U-K0D3-D12 K-frame circuit breaker is a molded-case circuit breaker that can be attached to motors by using wiring that is rated to operate 75 degrees Celsius. The circuit breaker is a non-stop device, and this means that once it has detected a fault and this fault has been cleared, the breaker can be set back into operation just the way it was before.