An RCD, or residual current device, is a life-saving device which is designed to prevent you from getting a fatal electric shock if you touch something live, such as a bare wire. people have been injured in electrical accidents at home and in industry. In Australia and New Zealand as well as in global markets, electrical safety authorities have advocated the wide use of residual current devices (RCDs), also known as safety switches or earth leakage devices, as an could. A residual-current device (RCD), residual-current circuit breaker (RCCB) or ground fault circuit interrupter (GFCI) is an electrical safety device, more specifically a form of Earth-leakage circuit breaker, that interrupts an electrical circuit when the current passing through line and neutral. SENTRON RCDs offer the right solution for any application, immediately cutting power during a fault to protect against dangerous shock currents. Why SENTRON residual current protective devices? SENTRON RCDs combine residual current detection and. Whether for protecting, switching, monitoring or measuring – BETA low-voltage circuit protection devices perform a wide range of functions for all applications in the area of electrical installation engineering. They are suitable for use in residential buildings, non-residential buildings or. For 50 years, we have been designing complete residual current protection solutions, including protection transformers tailored to your specifications.