Bemko N7-4-40-030 40A Three-Phase Differential Switch - Overload and Continuous Breaks

Hello !
I replaced the three-phase differential switch with a Bemko N7-4-40-030 40 A. Everything cools only after about 20 minutes, it starts to fly out, and when it first flies away, it flies non-stop. You have to disconnect it for about an hour and again hold 20 minutes and then continuous breaks. It behaves as if it had an overload member. There are combined differentials, i.e. a differential with overcurrent, but I have not read anywhere in the description or in the diagram that this circuit breaker has an overcurrent element. In addition, 40 A difference for an ordinary home is probably not too small. This is central protection for the whole house. I don't have any major power devices at home (standard equipment). I do not have any measuring equipment because it was in work, but if it was going to the ground, it is immediately and not after 20 minutes, at most on Monday I will bring it and measure it. If anyone has any ideas what is wrong I will be grateful.

Regards
mitgat

Leave the ground fault breaker alone and write what this installation is, what it protects. Just exactly.

Presumably a device with a variable duty cycle may be the cause.
However, without knowing the details, you can only predict the grounds.

Mitgat wrote:

I have replaced a three phase differential switch

Why did you replace it?

Mitgat wrote:

central protection for the whole house.

Typical installation budget error.

I had similar on one of the RCDs installed in my switchgear, from time to time he turned it off, so I turned off all the receivers that were connected to the circuits from this RDC but still every now and then 5 other times 20 min. RCD turned off. So I took the installation meter and decided to measure this RCD and when I tried to measure the current and time the symbol Err appeared on the meter ... RCD clearly to be replaced.
I do not write that it will be the same for you, but I wanted to emphasize that to find the reason it is best to use the right tools.

Take a photo of the switchgear without obstructions and write what the network layout is and whether you are doing something at the time when the RCD trips.

Maybe a stupid question, but you did not want to improve the installation sometimes and did not install it in a zeroed installation?

kSmuk wrote:

Maybe a stupid question, but you did not want to improve the installation sometimes and did not install it in a zeroed installation?

And then you could turn on the RCD?

karolark wrote:

And then you could turn on the RCD?

Yes, in many cases it would be possible to turn on the switch. Especially when the sum of current leakages does not exceed the switch threshold (e.g. no cooker connected to a steel gas pipe). Tripping usually occurs sporadically, when the leakage currents exceeds the threshold of the RCD trip.

kSmuk wrote:

... (e.g. no stove connected to a steel gas pipe). In such a case it usually turns off sporadically ...

But it does occur.
However, it should be clearly stated that this solution is unacceptable because the RCD breaks the protective conductor. And this must never be done.