A certain RCD has a rating of 30 mA - Leaving Cert Physics - Question h - 2017

The rating of 30 mA for a Residual Current Device (RCD) is significant as it indicates the maximum leakage current that the device can detect and trip to prevent electric shocks or fire hazards. This rating is particularly crucial in providing protection for humans against dangerous electric shocks, especially in environments where there is a risk of moisture or water exposure. When the current leakage exceeds this threshold, the RCD will swiftly disconnect the electrical circuit, thereby minimizing the risk of injury or damage.