Installing Plug-In Unit - ABB RELION 620 Series Installation Manual

Mounting
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.
1
Figure 3: Serial number in the case
20
Before fitting the plug-in unit into the case, check that the unit and the
case have the same serial number.
Rating label with serial number
Forcing an unsuitable plug-in unit into the case can break both the plug-
in unit and the case and may cause danger.
1MRS757641 G
1
620 series
Installation Manual