RCCB Breaker Tripping?

[Dave1UK]

Woke up this morning and tried to turn on the computer (work from home) wouldn't power on, checked lights they worked fine. Went downstairs to check the switchboard and only the RCCB breaker was tripped, all other MCBs on. I can narrow this down to it occurring between 06:30 - 07:30 this morning (based on Ring doorbell camera), not that is it of much use knowing this?

As soon as I flipped the RCCB on, it tripped immediately, flipped it on again and it stayed on. An hour later, the RCCB tripped again although this time along with the kitchen MCB. Few minute ago now flipped both on and it's on (currently).

This has never happened before, we haven't bought/plugged in any new appliances, definitely not between 06:30 - 07:30, as all asleep.

In the kitchen we only have 2 fridges plugged in/operating 24/7, microwave (standby) and that is literally it, everything else switched off at mains. I switched off the microwave at mains as well now, so only 2 fridges are plugged into the sockets.

Is there a way to narrow this down further/figure out what could be causing it prior to calling someone in?

Thanks.

 

[lawrence101]

RCCB is an acronym of Residual Current Circuit Breaker. These devices are solely intended to detect imbalance between line and neutral. They will trip when current leakage to earth exceeds a set value, but will not trip due to overload - the devices downstream of it deal with overload.

I see . Would that be equivalent to a GFCB ( Gound fault circuit breaker ) here in Canada ?

 

[newfutile]

I think over there you would call it a gfci which we call an (RCD) Residual Current Device or RCCB, an RCBO here is an (RCD) Residual Current Device with an mcb in one unit