but it even happens when it’s the only unit connected to circuit (I disconnected all other unites ) , does anybody know the hi-cap ampers ?
It reminded me when I sold my 300 dr for someone living in Luxembourg. He had the same problem. However he changed for another power wall outlet and it worked without breaking.
Our HiCap olive will trip the UK breaker very occasionally too, good luck. Don’t change any breaker value though. 
I even changed the outlet to Furutech FP-SWS Gold , but it didn’t help
thanks , good to know
The nominal power draw should be in the manual, the label on the back of the device and/or is printed on the equipment fuse. However, inrush current when turning on can exceed this very much and the FAQ on equipment fuses gives some insight even if in your case it is the breaker:
However, at the instant that a transformer is first connected across the mains (unit switched on) a transient current up to 10 to 50 times larger than the rated transformer current can flow for several cycles.
The inrush current *** will depend on the transformer characteristics and the point on the power curve at which connection is made to the AC source. If the transformer core retains any residual magnetism the inrush may well be even more severe.
i.e., waiting some time after turning off before you turn on again may help. Giving the power button a decisive push instead of a slow dithering one may also help. Plus, or course, keep it on in the first place most of the time (though some say turning it off for half an hour every few months is good for SQ and I am afraid I had the same experience - don’t ask me for an explanation 
)
The equipment fuses are of the “slow” type to survive this inrush, and even then it is occasionally marginal depending on circumstances of turning on. The regular German breakers seem to be just a bit more sensitive
More on
Thanks , actually from experience I’m doing the same (Giving the power button a decisive push) , I’ll follow your recommendation
I just edited some more info into my post, in case it helps
Dose the nap200 has the same behavior , I’m planning to buy one ?
I don’t know, but with my 300 PS I manage to trip the German breaker every few times I turn it on (which I rarely do. When it was new and there was more reason for turning on and off, it seemed to trip 1 out of 3 times, though I have not rigorously tested this). Haven’t managed this with the XPS though.
By the way, I believe that alternative breakers that do not do this are an option even in Germany. As always, only let a qualified electrician make modifications. Breakers cost a few Euros and an electrician should get it done in a short time. It will make sense to talk to a dealer in your locations, it’s probably not the first time they encounter this and may have suggestions
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this is what I planned to do , to see if he has any recommendation , I’ll tell you about that
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Have you the possibility to connect your hicap in another home, or even another room, to see if it’s really a faulty hicap or mains problem?
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I have this problem from time to time when plugging in and turning on after taking apart and reinstalling Fraim.
It’s down to a large inrush current normally and common with Naim gear.
I just reset the breaker and it’s fine. I don’t power on and off unless I am making changes or there is a lightning alert.
You can try different style breakers that don’t cause nuisance trip out. I believe type C are less sensitive to nuisance tripping.
Or just leave it alone.
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There’s nothing like a polite request for help is there…
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First, Naim PSUs are intended to be left on all the time for optimum performance, so regular switching on shouldn’t be necessary.
As already mentioned, these relatively heavy duty PSUs briefly have a big inrush current when switched on. This is what can trip a circuit breaker, especially if it has been specified for relatively lightweight domestic use. Changing the breaker to a correctly selected Type C version will almost certainly solve this issue if it’s permissable under your local electrical regulations.
Order 13A breakers instead of 10A. Since I changed they stopped going off. After going off even the first time Miniature circuit breakers can have degraded
(I use type C)
Hello,
I have three HiCaps, one recent HCDR & 2 x Olives which dont trip my circuit breaker, neither does the NAP200 we own. The power inrush for a HC is not that high, input power rated at just 40VA so it may be an idea to swap the power lead or try another socket.
Its best policy to leave Naim equipment permanently switched on, unless theres good reason not to ie thunderstorms etc.
Naim perform extensive QA/QC, both on individual components prior and during assembly as well as finished products.
I have had the power trip using a furutech mains plug on 555PS, and standard Naim plugs on an Olive hicap.
It’s not uncommon and nothing major to worry about. If it trips while it’s on rather than when plugging in or powering up, that’s a different matter.
If the system is powered up most of the time other than lightning strikes it shouldn’t cause too much distress.
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It comes down to luck of the draw, when the switch contacts close and where the 50Hz or 60Hz mains supply is in its cycle. The highest current would occur in a transformer circuit when the rate of change in the primary voltage is at its highest, ( i.e. at zero crossing point).
I turn my system on and off every time I use it, (shock horror) and operate my system from a type B 32A MCB protected circuit. I have managed to trip my circuit breaker twice in 5 years.
As Dan says its not uncommon.
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