IEC 61439-3:2024 edition 2. 0 defines specific requirements for distribution boards intended to be operated by ordinary persons (e., switching operations and replacing fuse-links), e. An earth-leakage circuit breaker (ELCB) is a safety device used in electrical installations to prevent shock. of dry period with xenon lamp providing a total test period of 500 hrs. The current ELCB is renamed as RCCB or RCD while the voltage ELCBs are. Three common devices used for this purpose are Earth Leakage Circuit Breakers (ELCBs), Residual Current Devices (RCDs), and Residual Current Circuit Breakers with Overcurrent Protection (RCBOs). Instantaneous protection against short-circuits, with a fixed pickup Ii.