Residual Current Device (RCD) Protection What is an RCD? A Residual Current Device (RCD) trips the circuit when it detects an earth fault current, providing an extremely effective form of shock protection. How RCDs Work The amount of current flowing through the phase (line) should return through neutral. An RCD continuously monitors the current flow and detects any mismatch between the current flowing through phase and neutral. If an imbalance is detected, the RCD trips the circuit within 30 milliseconds, preventing potential electric shock or fire hazards. Common RCD Ratings and Their Applications 30 mA (milliamps) – Maximum permissible for personal shock protection. 100 mA – Provides enhanced shock protection, though not as sensitive as 30 mA. 300 mA – Maximum permissible for fire protection. Why Use RCDs? Prevents electric shock by cutting off power within milliseconds. Limits fire risks caused by earth faults. Detects faults early, preventing damage to electrical installations. P...
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