Short-circuit-proof safety isolating transformer
A shield containing two overlapping vertical circles with a horizontal line across their overlap and a small square box directly under the lower circle. · also called “kurzschlussfest”, “safety isolating transformer short-circuit proof”, “short-circuit proof”, “short-circuit-proof transformer”
What the Short-circuit-proof safety isolating transformer symbol means
Stays safe if overloaded or short-circuited
Marks a short-circuit-proof safety isolating transformer, as found in plug-in power adapters. If the output is overloaded or short-circuited, its temperature stays within the set limits, and once the overload or short circuit is removed it still meets all the safety requirements of its standard. The small box under the circles is what distinguishes it from the plain safety isolating transformer mark.
Source · Manufacturer manual Medion robot vacuum cleaner operating instructions, symbols on the power adapter (German) · checked
Where it appears
- EN 61558—This meaning
Questions about the Short-circuit-proof safety isolating transformer symbol
- What does the Short-circuit-proof safety isolating transformer symbol mean?
- Marks a short-circuit-proof safety isolating transformer, as found in plug-in power adapters. If the output is overloaded or short-circuited, its temperature stays within the set limits, and once the overload or short circuit is removed it still meets all the safety requirements of its standard. The small box under the circles is what distinguishes it from the plain safety isolating transformer mark.
- What does the Short-circuit-proof safety isolating transformer symbol look like?
- A shield containing two overlapping vertical circles with a horizontal line across their overlap and a small square box directly under the lower circle. It is also called “kurzschlussfest”, “safety isolating transformer short-circuit proof”, “short-circuit proof” and “short-circuit-proof transformer”.
- Which standard defines the Short-circuit-proof safety isolating transformer symbol?
- It follows EN 61558.
Checked against the source · · How we verify
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