I am having problems with a residual current circuit breaker (RCCB) tripping frequently.
The breaker is located in the panel of a newly renovated flat in a three-floor building (basement floor, if it matters). The breaker trips in stormy weather with thunder storms and high winds. For example, it just happened three times within 20 minutes today. However, it also trips on dry sunny days in the summer time without any weather, but that happens less frequently and less predictably.
The device was newly purchased, with all the other breakers in the panel.
When the device trips, none of the 20 individual breakers are tripped.
When the device trips, I cannot physically reset the breaker, it is impossible.
I first have to turn off all of the 20 individual breakers. Then I am able to easily reset the RCCB breaker (without any effort).
I then reset all 20 individual breakers.
I have tried resetting the individual breakers one at a time, but that does not help. I cannot reset the RCCB with any single individual breaker reset by itself.
When an incident as I have described happens, none of the other floors in the building have their RCCBs tripped.
The device is made by Legrand which is a highly respected brand.
The device was purchased new in late 2020.
Its model information: XC3 40A 30mA 4031 83
As I am located in Turkey, there’s a local site in Turkish from the vendor, but I was unable to find a global Legrand page on it. https://www.legrand.com.tr/urunler-ve-sistemler/koruma-ve-endustriyel/moduler-urunler/xc-dx-kacak-akim-koruma-anahtarlari
On the web, it retails for around 24 USD: https://www.hepsiburada.com/entes-legrand-403183-2x40a-30ma-ac-tipi-xc3-kacak-akim-koruma-anahtari-p-HBCV00002TU59M
An experienced local electrician told me that an expensive test equipment exists for locating the fault, but that he doesn’t have it.
Can the device be faulty? As the brand is a quality one, I am thinking this is not likely. How would you suggest I go about solving this problem?
Note: I have reviewed the following question here: What could be a reason for RCCB triggering?