The Eaton Cutler-Hammer/Allen-Bradley 140G-K6F3-D40 molded case circuit breaker as part of the 140G molded case circuit breakers series. This device runs on a voltage rating of 600 Volts AC, and it has a K frame type with a rating of  400 Amps. It also has an interrupting rating of 65 kA, 3 poles, and 3 phases. It also features standard interrupting capabilities, the bolt-on connection types, and long-time and instantaneous trip functions. As with other 140G circuit breaker trip units, the 140G-K6F3-D40 circuit breaker is globally approved for CSA, UL, and CCC rated applications, and IEC rated performance. It is specially designed to provide trip unit protection. Further, these circuit breakers offer amazing customization capabilities for the trip units and they also come with a wide selection of operation techniques to match many panel setup configurations.

Molded case circuit breakers like the 140G-K6F3-D40 circuit breaker are a unique type of circuit breaker. According to NEMA, circuit breakers are devices that open and close a circuit by manual means, and that automatically opes the circuit on a preset overcurrent without damaging themselves when they are applied correctly within their rating ranges. A molded case means the structure of the circuit breaker is assembled in a unit that supports insulating material housing. The role of molded case circuit breakers, including the 140G-K6F3-D40 molded case circuit breaker, is to protect conductors and connected equipment from overcurrents by automatically opening before the current reaches a level that is too high and too hazardous to the surrounding components.