This time I bring you a new course where we’ll see the different circuit breakers coordination principles and benefits.
Cascading between two circuit breakers is achieved by using the tripping of the upstream circuit breaker A to help the downstream (load side) circuit breaker B break the current. This allows the selection of downstream devices with lower breaking capacities, and therefore lower cost.
In other words, the upstream circuit breaker helps downstream devices break short circuit currents that are greater than the highest short circuit currents that they can break.
By principle, cascading is in contradiction with selectivity. But can you get the cost benefits of cascading, plus the continuity advantages of selectivity?
Check it out in the following eLearning about Power Availability (duration 20 mins):