Chargers and power adapters symbols chart

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1. BatteryBattery compartment or battery terminals
2. Battery orientation (+ / -)Which way round to insert the battery
3. Class II equipment (double insulation)Double or reinforced insulation, no earth needed
4. Class III constructionProtection class III construction
5. DC plug polarity: centre positiveCentre pin positive, outer sleeve negative
6. Detachable power supply unitCharged through its separate, detachable power supply
7. Direct current (DC)Direct current rating or connection
8. Efficiency level VIPower supply meets efficiency level VI
9. For indoor use onlyUse only indoors, in dry rooms
10. FuseMarks a fuse, for example on a transformer, power supply or device rating plate.
11. Non-short-circuit-proof safety isolating transformerSafety isolating transformer, not short-circuit-proof
12. Safety isolating transformerContains a safety isolating transformer
13. Self-protecting (fail-safe) safety isolating transformerSelf-protecting safety isolating transformer
14. Short-circuit-proof safety isolating transformerStays safe if overloaded or short-circuited
15. Switch-mode power supplyAdapter is a switch-mode power supply
16. Thermal cut-outBuilt-in thermal cut-out