The Allen-Bradley 140U-I6C3-D12-S Circuit Breaker is a 140U Series Inverse Time Molded Case Circuit Breaker (MCCB) that consists of a 3-pole I-Frame unit with a continuous current rating of 120 Amps. The typical application of this circuit breaker is in the protection of the feeder circuit of a motion control installation in manufacturing industries. It comes from the factory with a fixed magnetic and thermal trip setting, and it is non-adjustable by the end-users. Another important feature of the Allen-Bradley 140U-I6C3-D12-S Circuit Breaker is that it responds to overcurrent in an inverse-time fashion, which means that for lower overcurrent, it tends to extend its tripping time, and for higher overcurrent, it tends to shorten the time. This feature offers higher levels of more sensitive protection against higher over-currents than other breakers while providing stability in cases where the overcurrents are not so high.

The Horsepower ratings of the circuit breaker vary depending on the voltage used in the final user installation, and they can be 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.  The interrupting rating or breaking capacity is 65 kA and the magnetic tripping range is between 800 Amps and 1600 Amps. The Allen-Bradley 140U-I6C3-D12-S Inverse Time Circuit Breaker is also suitable for hosting additional components such as the internal control modules, auxiliary contacts, rotary operators, and flex cable operators. The Allen-Bradley 140U-I6C3-D12-S MCCB should be mounted in a protected enclosure, and all services, maintenance, or other related operational procedures should only be performed by qualified electricians following strict safety procedures and guidelines.