What does the term "coordination" refer to in overcurrent protection?

The term "coordination" in overcurrent protection specifically refers to the proper selection of protective devices to ensure that only the nearest device trips during a fault. This concept is critical because it helps to isolate the fault while allowing the rest of the system to continue functioning normally. When coordination is achieved, the protective devices are arranged in such a way that the one closest to the fault responds first. This minimizes disruption and reduces the likelihood of unnecessary outages in the wider electrical system.

By ensuring that only the nearest protective device operates, coordination effectively protects both the equipment and the overall electrical system, allowing for systematic fault management. This principle is essential for maintaining operational reliability and safety in electrical systems.