Symbols and designations

Symbol and designation Standard Description
V EN 61558-1 Volt
A EN 61558-1 Ampere
VA EN 61558-1 Volt-ampere
W EN 61558-1 Watt
Hz EN 61558-1 Hertz
PRI EN 61558-1 Input winding (primary winding)
SEC EN 61558-1 Output winding (secondary winding)
  EN 61558-1 direct current
N EN 61558-1 neutral terminal
  EN 61558-1 single-phase alternating current
  EN 61558-1 Three-phase alternating current
  EN 61558-1 Three-phase alternating current with neutral wire
  EN 61558-1 class II construction
  EN 61558-1 class III construction
  EN 61558-1 fuse
  EN 61558-1 slow blow fuse
  EN 61558-1 enclosure terminal or core terminal
  EN 61558-1 earthing terminal
  EN 61558-2-2 fail-safe control transformer
  EN 61558-2-2 non-short-circuit proof control transformer
  EN 61558-2-2 short-circuit proof control transformer (inherently or non-inherently)
  EN 61558-2-1 fail-safe separating transformer
  EN 61558-2-1 non-short-circuit proof separating transformer
  EN 61558-2-1 short-circuit-proof separating transformer (inherently or non-inherently)
  EN 61558-2-4 fail-safe isolating transformer
  EN 61558-2-4 non-short-circuit proof isolating transformer
  EN 61558-2-4 short-circuit proof isolating transformer (inherently or non-inherently)
  EN 61558-2-6 safety isolating transformer
  EN 61558-2-6 fail-safe safety isolating transformer
  EN 61558-2-6 non-short-circuit proof safety isolating transformer
  EN 61558-2-6 short-circuit proof safety isolating transformer (inherently or non-inherently)
  EN 61558-2-19 non-short-circuit proof isolating transformer attenuating disturbances
  EN 61558-2-19 short-circuit proof safety isolating transformer attenuating disturbances
  EN 61558-2-13 fail-safe safety autotransformer
  EN 61558-2-13 non-short-circuit proof autotransformer
  EN 61558-2-13 short-circuit proof autotransformer (inherently or non-inherently)
  EN 61558-2-20 choke without overload protection
  EN 61558-2-20 choke with overload protection
  EN 61558-2-15 non-short-circuit proof isolating transformer for supply of medical location

 

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