Wylex Type B Single Pole RCBOs Circuit Breaker\r\nThe new miniature RCBO for the Wylex NM Range of consumer Units for domestic duty, in type B for surges between 3-5 the start-up current. RCBOs take up less space in the consumer unit and so provide more wiring space for the installer, making the installation process easier and quicker. Wylex RCBOs go one step further, they have switched neutral built-in as standard, live and neutral conductors do not have to be disconnected for insulation resistance testing. This saves time and money, particularly for responsible landlords who regularly test installations during occupancy voids.