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230 Volt 50 Hz - Residual Current Devices (RCD’s)

Two Pole RCD

Four Pole RCD

A residual current device (RCD, or R.C.D. henceforth) is the

generic term for a device that monitors the current in the

line conductor and the neutral conductor of a circuit in an

earthed system.

In a circuit that’s operating properly, the vector sum of the

live and neutral current values added together will be zero.

Current ﬂowing to earth, due to a line earth fault, will return

via the earth conductor, and regardless of load conditions,

will be registered as a fault. This current ﬂow will give rise to

a residual current that will be detected by the device. If the

residual current exceeds the rated sensitivity of the RCD, it

will automatically activate a tripping of the faulty circuit.

Typical speciﬁcations are as follows:

Residual Current Devices ( RCD’s ) range

Sensitivity - from 10 to 500mA

Voltage - 2 poles : 230V; 3/4 poles: 230/400V

Connection capacity

- 25A: 6/10 mm² (ﬂexible/ rigid cable)

- 40,60A: 16/25 mm²

- 80,100A: 35/50 mm²

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