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Residual overcurrent protection is often provided in modern microprocessor based relays that have three phase inputs, and no neutral input. Sometimes this is provided even if a neutral input is present. It is similar to neutral overcurrent, where the neutral current is directly measured through the neutral input of the relay. for residual overcurrent, the three phase currents are vectorially summed together to form the residual overcurrent.

This relay measured 3I0 current, or ground current.

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