The 140U-H6C3-D12-A circuit breaker is a molded case circuit breaker that has been manufactured and designed by Allen-Bradley/Rockwell Automation. The breaker has been included in the 140U series of circuit breakers and motor protection equipment. It comes with a high interrupting capacity of 60 to 69 kiloamps at a specific frequency of 60 Hertz. This drive comes with two different detection mechanisms that consist of a fixed thermal mechanism and a fixed magnetic mechanism. The magnets can trip at a capacity of 1250 Amps. This breaker has all the specifications of the Frame H equipment. The Allen-Bradley/Rockwell Automation 140U-H6C3-D12-A molded case circuit breaker provides overcurrent and short-circuit protection to conduits and equipment, especially motors. It is important to compare and revise each specification before attempting to install the breaker with any equipment.

It is recommended to install ventilation equipment around the Allen-Bradley/Rockwell Automation 140U-H6C3-D12-A molded case circuit breaker to avoid problems when it is exposed to high temperatures mainly due to the breaker operating with thermal detection that can be altered when it is exposed to overheating. The maximum operating temperature should not exceed 75 degrees Celsius and the cables and wiring that are used must be rated for operations at 75 degrees Celsius or higher. The Allen-Bradley/Rockwell Automation 140U-H6C3-D12-A molded case circuit breaker can be attached to the motor or installed in a series with other breakers to protect a whole circuit of equipment. The breaker must not be exposed to corrosive chemicals, vapors, or gases. It closes automatically when a dangerous current has been detected. The breaker does not include a proper enclosure but it is recommended to install the breaker in one.