Differences in The Use Of Residual Current Circuit Breakers

1. Residual current devices (RCDs) are installed at the branch circuit outlet, while residual current devices (RCDs) are installed at each appliance terminal, making them end-user installations. This makes installation and maintenance more convenient.

2. Difference in Leakage Conditions: When a residual current device (RCD) leaks current, because it's installed at the branch circuit outlet, the entire branch circuit will lose power, leaving the house without electricity. However, when an appliance or wire on a branch circuit leaks current, only that branch circuit will be de-energized, and the appliance will not function.

3. Difference in Wiring Protection: RCDs only protect the live wire, while RCDs protect both the live and neutral wires.

4. Difference in Leakage Current and Tripping Time: RCD: I△n = 30mA, tripping time 0.1s; RCD: I△n = 6mA, tripping time 0.025s. RCDs have a lower rated residual leakage current, are safer, pose less harm to the human body, and trip quickly, protecting life and property.

Its applicable range is AC 50Hz with a rated voltage of 380 volts and a rated current up to 250 amps.

Installing a residual current device (RCD) in a low-voltage power distribution system is one of the effective measures to prevent electric shock accidents, and also a technical measure to prevent electrical fires and equipment damage caused by leakage. However, installing an RCD does not guarantee absolute safety; prevention should still be the primary focus during operation, and other technical measures to prevent electric shock and equipment damage should be implemented simultaneously.