EVS-EN IEC 62271-108:2021

This part of IEC 62271 applies to high-voltage alternating current disconnecting circuitbreakers
for operation at frequencies of 50 Hz and 60 Hz on systems having voltages above
52 kV.
This document identifies which requirements of IEC 62271-1, IEC 62271-100:– and
IEC 62271-102 are applicable. It also gives the additional requirements specific to these
devices.
This document covers single switching devices which perform the functions of both a circuitbreaker
and a disconnector by means of contacts housed in a single enclosure, and in which
the circuit-breaker contacts in the open position satisfy, or contribute to, the isolating
requirements of the disconnector function. As there is interaction between the requirements of
the separate functions, it is important to consider the standardization of requirements. This
document details the requirements for a disconnecting circuit-breaker, identifying where these
differ from the separate requirements of a discrete circuit-breaker and a disconnector.