The Allen-Bradley 140U-I6C3-D15 Molded Case Circuit Breaker (MCCB) is an inverse time, 3-pole, I-Frame overcurrent protection device with a continuous current rating of 150 Amps. The Horsepower ratings are different for different voltages according to the user applications, and they specifically are 25 Horsepower at 200 Volts AC, 25 to 30 Horsepower at 230 to 415 Volts AC, 50 Horsepower at 380 to 415 Volts AC. The Allen-Bradley 140U-I6C3-D15 Circuit Breaker is widely employed for installations requiring overcurrent protection in motion control applications such as conveyor, palletizer, and elevator control applications. When used in combination with other elements such as contactors, it can be regarded as a part of a whole motor starter system.

The 140U-I6C3-D15 Molded Case Circuit Breaker behaves differently according to the magnitude of the overcurrents that are affecting the circuits. For large over-currents, it is designed to trip quickly to disconnect the load and provide effective protection. For smaller over-currents, the approach is slower and it only trips after a considerable amount of time has passed. The reason for this is that the Allen-Bradley 140U-I6C3-D15 Circuit Breaker is designed for providing high-speed protection against overcurrents and stability of lower intensity events. The interrupting rating/breaking capacity of the Allen-Bradley 140U-I6C3-D15 Circuit Breaker is of 65 kA, and its magnetic trip range falls between 800 Amps and 1600 Amps. The users can configure neither the magnetic nor the thermal protection tripping points, because they come preset by the factory. The Allen-Bradley 140U-I6C3-D15 Inverse Time Circuit Breaker has some additional components available such as the internal control modules, auxiliary contacts, rotary operators, and flex cable operators.