The 140U-J0D3-D12 Circuit Breaker is a 140U Series Molded Case Circuit Breaker (MCCB) designed and manufactured by Allen-Bradley. This circuit breaker is a 3-pole, J-Frame overcurrent protection device with a continuous current rating of 120 Amps. Its Interrupting Rating/Breaking Capacity is rated at less than or equal to100 kA. The Allen-Bradley 140U-J0D3-D12 Molded Case Circuit Breaker provides both thermal and magnetic protection against over-currents. The tripping point for thermal protection is not adjustable by the users, but the magnetic tripping point can be calibrated by using the adjusting wheel that is located on the front side of the case. Like the other circuit breakers in the 140U family, the Allen-Bradley 140U-J0D3-D12 Circuit Breaker is an inverse time protection device that varies its response speed according to the magnitude of the incoming overcurrent. Its gets disconnected faster when the incoming overcurrent is higher in magnitude and takes a longer time to disconnect when the incoming overcurrent is not so high.

The Allen-Bradley 140U-J0D3-D12 Molded Case Circuit Breaker Horsepower ratings will depend on the operation voltage rating. The Horsepower rating is 20 Horsepower at 200 Volts AC, 20 Horsepower at 380 to 415 Volts AC, 40 Horsepower at 460 Volts AC, and 50 Horsepower at 575 Volts AC. Accessories from Allen-Bradley may be added to the 140U-J0D3-D12 Inverse Time Circuit Breaker, including but not limited to Auxiliary Contacts, Flex Cable Operators, Internal Control Modules, and Rotary Operators. The IP protection rating of the circuit breaker is very low, so the Allen-Bradley 140U-J0D3-D12 Circuit Breaker should not be exposed to the typical industrial atmospheres but in a protected enclosure, in order to extend its lifecycle and prevent accidents.