SN EN 62271-105 : 2003

1 General
   1.1 Scope
   1.2 Normative references
2 Normal and special service conditions
3 Definitions
   3.1 General terms
   3.2 Assemblies
   3.3 Parts of assemblies
   3.4 Switching devices
   3.5 Parts of switching devices
   3.6 Operation
   3.7 Characteristic quantities
   3.8 Fuses
4 Ratings
   4.1 Rated voltage (U[r])
   4.2 Rated insulation level
   4.3 Rated frequency (f[r])
   4.4 Rated normal current and temperature-rise
   4.5 Rated short-time withstand current (I[k])
   4.6 Rated peak withstand current (I[p])
   4.7 Rated duration of short circuit ([k])
   4.8 Rated supply voltage of closing and opening devices
        and auxiliary circuits (U[a] )
   4.9 Rated supply frequency of closing and opening devices
        and of auxiliary circuits
   4.10 Rated pressure of compressed gas supply for operation
5 Design and construction
   5.1 Requirements for liquids in switch-fuse combinations
   5.2 Requirements for gases in switch-fuse combinations
   5.3 Earthing of switch-fuse combinations
   5.4 Auxiliary equipment
   5.5 Dependent power operation
   5.6 Stored energy operation
   5.7 Independent manual operation
   5.8 Operation of releases
   5.9 Low- and high pressure interlocking devices
   5.10 Nameplates
   5.11 Interlocking devices
   5.12 Position indication
   5.13 Degrees of protection by enclosures
   5.14 Creepage distances
   5.15 Gas and vacuum tightness
   5.16 Liquid tightness
   5.17 Flammability
   5.18 Electromagnetic compatibility (EMC)
6 Type tests
   6.1 General
   6.2 Dielectric tests
   6.3 Radio interference voltage (RIV) tests
   6.4 Measurement of the resistance of the main circuit
   6.5 Temperature-rise tests
   6.6 Short-time withstand current and peak withstand
        current tests
   6.7 Verification of the protection
   6.8 Tightness tests
   6.9 Electromagnetic compatibility tests (EMC)
7 Routine tests
8 Guide for the selection of switch-fuse combinations for
   transformer protection
9 Information to be given with enquiries, tenders and orders
10 Rules for transport, storage, installation, operation and
   maintenance
11 Safety
Annex A (informative) Example of the coordination of fuses,
                      switch and transformer
Annex B (normative) Procedure for determining transfer current
Annex ZA (normative) Normative references to international
                     publications with their corresponding
                     European publications

Applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches including switch-disconnectors and current-limiting fuses designed so as to be capable of breaking, at the rated recovery voltage, any current up to and including the rated short-circuit breaking current and making, at the rated voltage, circuits to which the rated short-circuit breaking current applies.