The Allen-Bradley 140U-I-CLC70 current limiter is an optional accessory for the I-Frame, 140U family of Molded Case Circuit Breakers (MCCB). It is a 3-pole, 70 Amps rated current limiter. This optional accessory can be added to any Circuit Breaker of the 140U family, specifically the ones with an I-Frame, to maintain the maximum level of overcurrent that is permissible under the rated values. The Allen-Bradley 140U-I-CLC70 current limiter's main function is to limit the energy that is supplied to downstream components. It provides enhanced protection and turns the 140U-I circuit breakers into current-limiting devices that are capable of opening the circuits in less than half of a cycle under fault conditions.

The Allen-Bradley 140U-I-CLC70 70A current limiter should only be installed on the load side of the circuit breaker. It has an interrupting rating of 200 Amps when used with I-frame breakers. These current limiters can be added to any I-Frame breaker of the 140U product family in the range of 15 to 70 Amps. Like any circuit breaker and all of its related accessories, the Allen-Bradley 140U-I-CLC70 70A current limiter has an open-type of construction and should never be placed under constantly humid or dirty conditions. Mounting the device inside of a protected enclosure or in a specially designed room is the best practice to follow. Failure to do so could result in serious accidents. A highly qualified technician should perform all major work on the device because the high levels of energy this piece of equipment can handle are more than enough to cause severe personal injuries, equipment damage, or even death.