How to Change a Fuse in a Wylex Standard Fuse Box Wylex boxes use MCB's (Miniature Circuit Breakers), also known as fuses. Unplug the malfunctioning appliance and test it by plugging it into another electrical outlet to Wylex Standard fuseboxes, part 1 - John Ward IntroductionFuses and Other DevicesInternalsto Upgrade - Or Not?These fuseboxes are well designed and made. Although they are still manufactured (2008), the design is no longer suited to modern installations. The main drawbacks are no facility to fit RCDs, and most of them are limited to 30A per circuit example shown here is a metal cased flush mounted unit from the 1960s. Originally this would have contained rewireable fuses, but has been 'upgraded' with push button circuit breakers, probably mid-1980s. One of the breakers is missing. Left to right,..See more on flameport Domestic Consumer Units | Fuse Boards | Screwfix A fuse board monitors and detects the current in each circuit and will trip the system if it is being overloaded to protect the premises and its occupants. With legislation being continually updated it is important that they are installed by a qualified professional to ensure that they are fitted and tested correctly. Wylex NMX 18-Module 10 Amazon: wylex fuses Standard Range New Quality Wylex R15 And R20 Re-Wireable Fuses And Holder Ampage: 20Amp WYLEX PUSH PLUG IN FUSE WIRE CARRIER AND BASE 30 AMP A. 4x 30 amp fuse BS1361 30A cartridge fuses socket cooker small showers consumer unit fuse box distribution board.