The Wylex Nhxsbs1b40 RCBO is a 40amp 30mA residual current circuit breaker with overload protection, designed for electrical wiring applications. It features a DIN rail mounting style and screw terminal electrical connections, suitable for interior use. With a tripping characteristic of Type B and an IP20 rating, it offers instantaneous break time and is weather resistant. Made of ABS/plastic material and manufactured in the United Kingdom, this RCBO is ideal for providing safety in electrical circuits with a single pole design.