The CBi Earth Leakage 1 Pole + N 6kA RCD (QF17A) is a dual-mount residual current device designed for DIN and Samite rail installation on distribution boards. It features hydraulic-magnetic technology for accurate, temperature-independent tripping and energy-limiting capability for enhanced protection against earth faults and leakage currents. Ideal for residential, commercial, and industrial electrical installations requiring reliable earth leakage protection.