The Allen-Bradley 140G-K6F3-D30-AA Circuit Breaker is a 3-pole molded case circuit breaker, with a current rating of 400 Amps, a K-Frame, an interrupting rating or breaking capacity of 65 kA, adjustable thermal and magnetic tripping points, a 300 Amps current rating, and 1 built-in auxiliary contact and 1 alarm contact, both rated at an operating voltage of 250 Volts. Both the thermal and magnetic tripping points are user-adjustable by using screws that are placed on the front side of the circuit breaker. The adjustable current range for the thermal trip is between 210 and 300 Amps, and the range for the magnetic trip is between 1500 and 3000 Amps. Some of the additional accessories that are also available for installation in the 140G-K6F3-D30-AA Circuit Breaker are auxiliary contacts, the undervoltage trip, trip contact blocks, and the shunt trip.

The Allen-Bradley 140G-K6F3-D30-AA Circuit Breaker is designed to handle a high level of current and voltage that should be treated with special care by the service or maintenance personnel. Only qualified electrical technicians should attempt to perform any maintenance work that requires them to disarm and rearm the molded case circuit breaker because any mistake committed in the process could endanger the machine or installation and be a hazard for all the people in the immediate area.  Molded case circuit breakers such as the Allen-Bradley 140G-K6F3-D30-AA Circuit Breaker are also suitable for applying locking and tagging procedures to open the flow of energy to downstream circuits. By using the incorporated auxiliary and alarm contacts, it is possible to monitor the ON or OFF status of the breaker and apply the necessary actions according to the users' application needs.