Residual Current Devices (RCD)
Residual Current Devices are switches that trip a circuit under dangerous conditions to disconnect the electricity. These switches can protect multiple circuits at the same time. In a board there will be 2 of them (a split-load) this means that if there is a problem you won’t lose power for the whole property. RCDs are much more sensitive than normal fuses, and they provide extra protection against serious harm from ongoing electric shock.