What is the expected Maximum Trip Time for a 600V, 2500A molded-case circuit breaker inverse time test at 300% of Rated Continuous Current?

The expected Maximum Trip Time for a 600V, 2500A molded-case circuit breaker when subjected to an inverse time test at 300% of the Rated Continuous Current is indeed 850 seconds.

In this context, the inverse time characteristic of a molded-case circuit breaker indicates that as the fault current increases, the trip time decreases. For a test current that is set at 300% of the rated continuous current, which in this case is 2500A, the breaker should trip at a prescribed time to ensure it functions properly under overload conditions.

The trip curve for molded-case circuit breakers typically provides a range of trip times based on the multiple of the rated current applied. A 300% current (which is 7500A) typically corresponds to an expected trip time defined in the manufacturer's specifications or standards for that specific type of breaker. In this scenario, reaching a Maximum Trip Time of 850 seconds aligns with these typical operational characteristics and ensures adequate protection for electrical systems against prolonged overloads.

This information reflects standard practices and helps ensure safety and functionality in electrical installations, confirming that the breaker operates as intended under abnormal conditions.