Residual Current Circuit Breakers A range of high sensitivity 2 & 4 pole residual current devices that will open a circuit automatically in the case of an earth leakage fault between phase and earth and / or neutral and earth greater or equal to 10 or 30mA. Suitable for domestic, commercial and industrial installations. Positive Contact Indicator Earth Fault Indicator Resistant to nuisance tripping with transient voltages hager