The power supply voltage switch is a small slide switch used to set the power supply input voltage to either 110v/115v or 220v/230v.
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What Is a Power Supply Voltage Switch?
SANPU SMPS 400w 12v LED Power Supply Constant Voltage Switch Driver 220v 110v ac/dc Light Transformer Rainproof Outdoor Use IP63 – Shop SANPU Power Supply Online
RS PRO Switching Power Supply, 12V dc, 12.5A, 150W, 1 Output, 170 → 264 V ac, 85 → 132 V ac Input Voltage
performance - PC loading programs slower than normal after voltage change - Super User
SUGON 3010PM Programmable DC Power Supply 30V 10A Voltage Current Regulator Stabilized Power Supply Voltage Switch AC 220V 110V - AliExpress
What Is a Power Supply Voltage Switch?
Why do some SMPS power supplies require an input voltage select switch? - Electrical Engineering Stack Exchange
Switched-mode power supply - Wikipedia