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Surge Protected?

It might be...for a while? That applies to the 3 pin multi socket outlet slabs you can buy. Spendy stuff for nothing much...usually. 

This is the business of getting special devices to stop power spikes (energy bursts) damaging electronics. Usually this kind of "mains disruption" arises from domestic motor switching (washing machines/fridges/freezers).  

The principal is to slap a MOV device (fused allegedly) directly across the 240v mains incoming to your equipment. You can well imagine what happens when a spike causes the MOV to operate...if its still capable? Clamp/reduce spike....fast!

spike = fast voltage jump above 240v (ugly/dirty transition)
MOV = metal-oxide varistor

This kind of circuit usually has a neon lamp to indicate your device is protected...anybody check that lamp periodically? Likely they stick high radiance blue LEDs on these days. Who is the idiot that does that? My loft is illuminated almost completely by just one of those.

So, on the day you really want your stuff to work and mysteriously it doesn't, add this to your list. 

I'm not saying this MOV thing never works...just that there exists many variants of it. Lets say "quality issues".

For all their faults chronicled elsewhere in this astute forum, I use the Vape Mesh Company for my Muji and find it nice and firm and easy to use.
www.vape-atomizer-mesh.com/products/100--Pure-Cotton-Pad----2713.html