DANSK DSF/PREN IEC 62271-105 PDF

Clause 1 of IEC 62271-1:2017 does not apply, and is replaced as follows: This part of IEC 62271 applies to three-pole units for public and industrial distribution systems which are functional assemblies of switches composed of switches or switch-disconnectors and current-limiting fuses designed so as to be capable of – breaking, at the rated voltage, any current up to and including the rated short-circuit breaking current; – making, at the rated voltage, circuits to which the rated short-circuit breaking current applies. It does not apply to combinations of fuses with circuit-breakers, contactors or circuit switchers, nor for combinations for motor-circuits nor to combinations incorporating single capacitor bank switches. This standard applies to combinations designed with rated voltages above 1 kV up to and including 52 kV for use on three-phase alternating current systems of either 50 Hz or 60 Hz. In this standard, the word “combination” is used for a combination in which the components constitute a functional assembly. Each association of a given type of switch and a given type of fuse defines one type of switch-fuse combination. Different types of fuses may be combined with one type of switch, which give several combinations with different characteristics, in particular concerning the rated continuous currents. A switch-fuse combination is then defined by its type designation and a list of selected fuses defined by the manufacturer, the so-called “reference list of fuses”. Compliance with this standard of a given combination means that every combination using one of the selected fuses is proven to be in compliance with this standard.