RESOLVED What is "VSB" on a power supply?

Hi gang,

The pic shows the label on a desktop pc power supply… I understand the DC outputs like 3.3, 5 (circled red) and 12V, but I’ve never noticed the +5VSB (circled purple) before.

Please can someone enlighten me as to what that is?

TIA,

Jim

power supply label.JPG

I believe the "+5V" part means the same as it does elsewhere. The "SB" part probably stands for "Stand-By" which would mean a 5V supply that is on even when the rest of the power supply is off. It's used to maintain memory or power the power switch.

Yep I got the +5V part too John :slight_smile:

But thanks, Stand By makes sense.

johnwasser:
power the power switch.

Gotta love that idea.... sorry, can't switch the power on cos there's no power to power the switch.

Well its used for wake-on-LAN etc, not just the power switch. Some machines have permanently powered USB sockets
too IIRC.

Confirmed from various Instructables like this one that the purple "SB" is indeed StandBy.