What is the RCD in a fuse box? | AnswersDrive The average cost to replace a fuse box is between £300 and £500 which includes all labour, materials, testing and certificate. This price assumes the replacement of an old fuse box with an RCD consumer unit on a regular 3-bedroom semi-detached house with 10 electrical circuits.4.3/5(3) RCD Fuse Box, Main Fuse Board – Raywe Electric One RCD has tripped in fusebox | DIYnot Forums Apr 22, 2012 – Hi, Fuse box is 3 years old, it has 2 rcd’s and one has tripped. We have checked the fuses in the wall sockets and all ok. We have checked the fuses in the wall sockets and all ok. Discover the Typical Cost to Replace a Fuse Box RCD stands for Residual Current Device and is a much quicker way of detecting a power surge or imbalance. The RCD can cut the power much faster than an old fuse box. RCDs are now compulsory for all new electrical work. Don’t accept a certificate issued by a different person; it must be by the individual who carries out the work. Domestic Consumer Units | Fuse Boards | Screwfix wwwwfix›Electrical & Lighting›Consumer UnitsFuse boxes for homes play a crucial role in helping to prevent electric shocks and electrical fires. 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. Fuse Box / Consumer Unit with RCD 240 V | The Campervan Shop £49 Fuse Box / Consumer Unit with RCD 240 V- This mains consumer unit gives you maximum protection with mains electricity in your campervan. It has all the facilities of the standard consumer unit but is internally wired for ease of fitting, a must for 240volt hook up.