Selectivity of Residual Current Devices (RCDs)

When circuit breakers are equipped with RCD function, selectivity principles described in previous paragraphs are valid for short-circuit and earth fault with high amplitude current.

Residual Current Devices are by design very sensitive to fault and shall be coordinated properly to achieve total selectivity in case of earth fault, in addition to overcurrent protection selectivity.

For more details on RCDs selectivity, see chapter F - Coordination of residual current protective devices

Related technical guides

Selectivity, Cascading and Coordination Guide

Get all required information to verify your electrical distribution design's robustness, considering overloads and short circuits.

Combine the benefits of selectivity and cascading to maximize power availability of your LV design at optimized cost.

Find Schneider Electric's coordination data for ACBs, MCCBs, MCBs, RCDs, busbar trunking (busways), motor starters and more.

Download the guide (.pdf)