Just curious what does -12V on PSU label mean?


I am curious what does -12V on PSU label mean? On my PSU it says -12V 0.3A 3.6W.
Do they matter? Should I know what they mean when buying PSU?

Thank you for your answers.
6 answers Last reply Best Answer
More about curious 12v psu label
  1. It's the ground.
  2. Best answer
    Mr5oh said:
    It's the ground.

    No, it's a -12 V rail.

    It's not used for much (if anything?) these days, I wouldn't worry about the -12 V amperage when deciding on a PSU.
  3. The −12 V rail was used primarily to provide the negative supply voltage to the RS-232 serial ports. and
    Voltage Rails
  5. If your in the market for a power supply,
    Toms has a decent roundup to start your search from:,4229.html
  6. Thank you all for your answers
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