The principle of a leakage current switch
Release time:
2018-09-21
The principle of a leakage current switch (also known as a residual current device or RCD) is based on the detection of imbalance between the live (phase) and neutral wires in an electrical circuit. When the current flowing through the live wire does not equal the current returning through the neutral wire, it indicates that some current is leaking to the ground, which could be due to a fault or a person coming into contact with a live part. The RCD continuously monitors the current and, if it detects an imbalance that exceeds a predetermined threshold (usually 30 mA for personal protection), it quickly disconnects the circuit, thereby preventing electric shock or fire hazards. This device is crucial for enhancing electrical safety in residential and commercial installations.
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