The 140U-D6D3-B50 circuit breaker is a 140U MCB circuit breaker by Allen-Bradley. The 140U-D6D3-B50 circuit breaker is built with the terminal covers that are meant to protect the users from accidental contact with the live parts. In addition, the parts provide the phase-to-phase insulation. The Allen-Bradley 140U-D6D3-B50 circuit breaker features motor operators which are operating mechanisms that enable the remote opening or closing of the circuit breaker. The motor operator mechanism is suitable for use in the power supply network supervisory control systems, and it comes complete with a padlock device. Fitted on the front of the 140U-D6D3-B50 circuit breaker, the motor operating mechanism is an alternative to the front flange operating mechanism or the rotary operating mechanism.

The shunt trip allows the 140U-D6D3-B50 circuit breaker to have the ability to be opened by using the electric opening release command. The shunt trip is usually housed and fitted in a slot within the module. Another feature of the 140U-D6D3-B50 circuit breaker is the undervoltage release which allows the unit to be opened by using a change in voltage of the power supply. The undervoltage release protects the system against low voltage, especially when it is operating the circuit breaker. The 140U-D6D3-B50 circuit breaker is also installed with the rotary operators which act as the main or feeder operators in an industrial control panel. The 140U-D6D3-B50 circuit breaker has an easy-to-use design and no tools are required for internal handling. The 140U-D6D3-B50 circuit breaker features a rated frequency of 50 to 60 Hertz, while the rated insulation voltage is 690 Volts IEC. The component features a pole configuration of 2 or 3 poles, while the breaking capacity is rated at 100 kA.