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Class II equipment (double insulation) symbol: two concentric squares: a small square centred inside a larger one
IEC 60417-5172
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Chargers and power adaptersConsumer electronics

Class II equipment (double insulation)

Two concentric squares: a small square centred inside a larger one. · also called “class 2”, “class II”, “double insulated”, “double square”, “protection class II”, “safety class II”

What the Class II equipment (double insulation) symbol means

Double or reinforced insulation, no earth needed

The device or power adapter is built to protection class II: its live parts are separated from everything you can touch by double or reinforced insulation, so its safety does not rely on a protective earth and it has no earth connection. An insulating plastic housing can make up part or all of that extra insulation. A two-pin plug without an earth contact is therefore normal for these products.

Source · Manufacturer manual Medion micro audio system with voice assistant, operating instructions (English section) · checked

Where it appears

Chargers and power adapters
  • IEC 60417
    —This meaning

Questions about the Class II equipment (double insulation) symbol

What does the Class II equipment (double insulation) symbol mean?
The device or power adapter is built to protection class II: its live parts are separated from everything you can touch by double or reinforced insulation, so its safety does not rely on a protective earth and it has no earth connection. An insulating plastic housing can make up part or all of that extra insulation. A two-pin plug without an earth contact is therefore normal for these products.
What does the Class II equipment (double insulation) symbol look like?
Two concentric squares: a small square centred inside a larger one. It is also called “class 2”, “class II”, “double insulated”, “double square”, “protection class II” and “safety class II”.
Which standard defines the Class II equipment (double insulation) symbol?
It is listed as IEC 60417-5172.

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