A distribution box uses MCBs, RCDs, and busbars to protect circuits, prevent shocks, and ensure safe power distribution in homes and buildings. You use a distribution box to divide electrical power into smaller circuits. If you know. 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. RCDs, or Residual Current Devices, are designed to monitor the electrical current flowing in a circuit and automatically disconnect the power supply if it detects an imbalance between the live and neutral conductors. Also known as a Residual Current Breaker (RCB) or Residual Current Circuit Breaker. Safely disconnect the power in the event of a fault with residual current devices (RCDs) — essential in building electrical distribution boards. Here you will learn how to connect RCDs, what to do if the fuse blows, and what types of RCDs are available. What does an RCD do? Also known as a ground. An accurate protection of people and electrical equipment against leakage currents can be achieved by installing Residual Current Devices (RCDs) which detect an imbalance of the electrical flow and trip assuring indeed protection against earth fault, reducing the risk of death or serious injury and. A distribution box is a low-voltage electrical enclosure that receives incoming power and distributes it safely to multiple outgoing circuits through protective and switching devices such as MCBs, RCDs, RCBOs, fuses, isolators, busbars, neutral bars, earth bars, and surge protective devices.