Wylex NHXS1B25 25A 30mA Micro RCBO B Type 1MW 1P+Swn. Wylex is a market leader in circuit protection, offering solutions for domestic, commercial, and industrial needs since 1897. The Wylex NM range of 17th Edition compliant consumer units provides easy installation with contemporary styling. The Wylex NHXS1B25 is a 25A, B curve miniature RCBO with switched neutral for enhanced safety in electrical installations. This RCBO isolates faulty circuits by disconnecting live and neutral conductors, ensuring healthy circuits remain operational to prevent nuisance tripping. Its compact size facilitates quick and simple installation, providing Ale wiring space. Tripping Residual Current: 30mA. Fuse Board, Fuse Box.