SymbolIndex
DC plug polarity: centre positive symbol: a minus sign in a circle on the left, a C-shaped ring around a solid dot in the middle, and a plus sign in a circle on the right, joined by short lines; the line from the dot runs to the plus. Some labels draw the signs in diamonds instead of circles
IEC 60417-5926
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DC plug polarity: centre positive

A minus sign in a circle on the left, a C-shaped ring around a solid dot in the middle, and a plus sign in a circle on the right, joined by short lines; the line from the dot runs to the plus. Some labels draw the signs in diamonds instead of circles. · also called “DC connector polarity”, “barrel plug polarity”, “center positive”, “centre positive”, “polarity symbol”, “tip positive”

What the DC plug polarity: centre positive symbol means

Centre pin positive, outer sleeve negative

Shows the polarity of a round (barrel) DC plug or socket. The dot stands for the centre pin and the C around it for the outer sleeve; the sign joined to each part gives its polarity. Here the dot is joined to plus and the C to minus, so the centre pin is positive and the sleeve negative. When using a replacement or universal adapter, make sure its polarity symbol matches the one on the device as well as the voltage.

Source · Official website Epson projector documentation: list of safety symbols on the equipment · checked

Where it appears

Chargers and power adapters
  • IEC 60417
    —This meaning

Questions about the DC plug polarity: centre positive symbol

What does the DC plug polarity: centre positive symbol mean?
Shows the polarity of a round (barrel) DC plug or socket. The dot stands for the centre pin and the C around it for the outer sleeve; the sign joined to each part gives its polarity. Here the dot is joined to plus and the C to minus, so the centre pin is positive and the sleeve negative. When using a replacement or universal adapter, make sure its polarity symbol matches the one on the device as well as the voltage.
What does the DC plug polarity: centre positive symbol look like?
A minus sign in a circle on the left, a C-shaped ring around a solid dot in the middle, and a plus sign in a circle on the right, joined by short lines; the line from the dot runs to the plus. Some labels draw the signs in diamonds instead of circles. It is also called “DC connector polarity”, “barrel plug polarity”, “center positive”, “centre positive”, “polarity symbol” and “tip positive”.
Which standard defines the DC plug polarity: centre positive symbol?
It is listed as IEC 60417-5926.

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