Tripping contact breaker

[StephenBarton]

I have a contact breaker that trips off randomly. Sometimes it's two or three times a week and at other times it can go six weeks or more without tripping. It doesn't seem to be associated with switching any lights or appliances on or off and I'm worried it could trip off when we're away on holiday and we could lose all the freezer contents. Does anybody know of an instrument I could hire or buy to find the fault that is causing this problem, please?

 

[StephenBarton]

Thanks Pauls0212 and telectrix for your suggestions to use an electrician. I googled RCCB tripping randomly and found this thread from 2016 on https://talk.electriciansforums.co.uk/topic/32188-rccb-tripping-randomly/ with a similar question from Wah007. The reply from "Trailer Boy" was most helpful. However, Wah007's experience with using various electricians suggests it's most important to find an electrician who has all the equipment suggested by Trailer Boy, and knows how to use it, which several of the electricians used by Wah007 did not. So the question now becomes "How do I find an electrician locally who has all this kit and knows how to use it?"