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Can you replace just the RCD, instead of whole consumer unit?

Former Community Member
Former Community Member
My apartment failed it's EICR due to the electrician not being able to trip the RCD in the required time.  I am told that the RCD cannot be replaced and a new metal consumer unit must be installed at a quote of £1180.  The apartment was built in 2003 and seems overly wasteful to ditch the whole unit, however I am not an electrician so would welcome some guidance please before I commit to this remedial action.


This is the RCD currently fitted:
5760S | MK 63 A RCD Switch, Trip Sensitivity 30mA | RS Components (rs-online.com)


It appears it worked within spec for above 30mA, but failed for below, if that helps with whether the whole consumer unit must be replaced.  See report.
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  • 0
    Some of the testing looks a bit, er, 'brief' (no Zs or R2 for the non-RCD circuits, test button on the RCD "N/A" and no attempt to insulation test at 500V even when the 250V test showed 'clear'?) - I do wonder if enough has been done to correctly establish that it is the RCD itself that's the problem - and not for instance a N-PE fault either within the fixed installation or in an appliance that might have been in-circuit during the "test" of the RCD, or just some connected appliance holding the voltage up for a fraction of a second - depending on the nature of the fail.

       - Andy.
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  • 0
    Some of the testing looks a bit, er, 'brief' (no Zs or R2 for the non-RCD circuits, test button on the RCD "N/A" and no attempt to insulation test at 500V even when the 250V test showed 'clear'?) - I do wonder if enough has been done to correctly establish that it is the RCD itself that's the problem - and not for instance a N-PE fault either within the fixed installation or in an appliance that might have been in-circuit during the "test" of the RCD, or just some connected appliance holding the voltage up for a fraction of a second - depending on the nature of the fail.

       - Andy.
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