Actually, no devices with foreign plugs may be sold in Switzerland. The fix adapter is permitted, but must be supplied free of charge by the seller. Only with it do 3 plugs no longer fit into the wall socket.
For devices with a cold-device plug (which is the case with the be quiet system power 9), I would leave out the adapter and order a CH cable for it. That way you don't occupy an entire triple socket with one plug. It bothers me anyway that the online retailers don't supply a suitable cable but only the adapters. OEM mains connection cable Switzerland plug IEC socket C13 (1.50m)
Rocksresort Laax: win a stay for 4 people
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We're giving away a voucher for Rocksresort Laax: 2 nights in a family flat for 4 people.