140U-H6C3-D12-D

The 140U-H6C3-D12-D circuit breaker is a circuit breaker that has been designed by Allen-Bradley/Rockwell Automation to provide overcurrent and short circuit protection to different equipment, especially motors. It belongs to the Frame H product line of the 140U series of motor protection devices. For this protection to be effective, the breaker needs to be appropriately installed. This means that the breaker must be located in a strategic place that considers the motor’s location and whether all the specifications of the different equipment that needs to be protected and the breaker’s rating are compatible. Other factors such as the voltage that is applied, the ambient operating temperature, and the operating altitude must also be considered since these can directly affect the efficiency of the drive. The Allen-Bradley/Rockwell Automation 140U-H6C3-D12-D circuit breaker has an interrupting capacity of 60 to 69 kA and a voltage of 220 to 620 Volts AC with a frequency of 60 Hertz.

The current detection method employed by the Allen-Bradley/Rockwell Automation 140U-H6C3-D12-D circuit breaker consists of a fixed thermal mechanism and a fixed magnetic mechanism. Breakers with dual detection mechanisms like the 140U-H6C3-D12-D circuit breaker are widely found in different industries and these enable the breaker to perform quicker current detection. This detection is performed by two bimetal bars that receive heat and a magnet. Once an abnormal or excessive current has been detected, the three poles perform a tripping action that stops the current flow completely. The maximum temperature allowed at 100% efficiency is 40 degrees Celsius, and it can operate at 75 degrees Celsius if it is derated. The higher the temperature, the higher the amount of derating the breaker will need to operate properly.