4.2.2 Installing plug-in unit
The protection relay is constructed in a way that a plug-in unit with voltage- or
current-measuring inputs can only be plugged into a corresponding case. This
prevents fitting an unsuitable plug-in unit into a wrong case.
Before fitting the plug-in unit into the case, check that the unit and the
case have the same serial number.
1 Rating label with serial number
Figure 3: Serial number in the case
Forcing an unsuitable plug-in unit into the case can break both the plug-
in unit and the case and may cause danger.
Mounting 1MRS757641 G
20 620 series
Installation Manual
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