Quick answer
No. Replacing an RCD requires working inside the consumer unit, which contains live parts that cannot be made safe without isolating the meter — that requires a qualified electrician.
Replacing an RCD is not a DIY job, even for confident home-improvers. The consumer unit contains parts that remain live even when the main switch is off — specifically the connections between the meter and the main switch. Working on these requires a qualified electrician. Beyond the safety risk, any work on a consumer unit that is not carried out by a qualified electrician must be notified to your local authority under Building Regulations Part P. Using an unregistered electrician for consumer unit work can also affect your home insurance.
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