Under normal conditions, circuit breakers are set with intentional time delays to ensure proper coordination across the system. This prevents unnecessary shutdowns but allows faults to persist slightly longer. During maintenance, when panels may be open and personnel are working close to energized components, this delay becomes dangerous.

An arc flash can release extremely high temperatures, intense light, and pressure in a fraction of a second. In such situations, reducing the time it takes to clear a fault is critical for protecting human life.

How ERMS works ?

When ERMS is activated, the breaker shifts into a mode where it trips almost instantly when a fault is detected. This removes the normal time delay and significantly reduces the duration of the fault. As a result, the total energy released during an arc flash is minimized.

Although this may lead to less selective coordination within the system, it greatly improves safety during maintenance work.

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