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1. Disconnectors (isolating switches)
Figure 8.3 - Legrand’s isolating switches
The disconnector is a mechanical device that fulfils in the open
position the requirements specified for the isolation function (IEC
60947-1).
The purpose of the isolating function is to cut off the supply
from all or a discrete section of the installation by separating the
installation or section from every source of electrical energy for
reasons of safety.
The key factor here is the opening distance. Isolation must be
guaranteed from pole to pole and from input to output, whether
this is by means of a visible isolation gap or by suitable design
features within the device (mechanical interlocking mechanism).
A device fulfils the isolating function stipulated under IEC
60947-1 when in the “Open” position the isolation at a defined
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