The signal connectors are left open when the plug-in unit is detached.
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.
1MAC457436-IB B
Section 4
Mounting
620 series ANSI
13
Installation Manual