The EATON HKD3400F is a 3 Pole circuit breaker with a maximum amperage of 400A and a current rating of 251-300A. It is designed by EATON CUTLER-HAMMER, a reputable brand known for producing high-quality electrical equipment and supplies. This specific circuit breaker, with the model number HKD3400F, along with the KES3125LSI trip unit, provides reliable and efficient protection for electrical circuits, making it an essential component for various industrial and commercial applications.