ABB REM 610 Installation Manual page 8

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Installation Manual
The relay features a built-in mechanical coding system that helps to prevent
dangerous situations from arising, should a non-suitable plug-in unit be fitted into a
relay case.
Danger!
!
Forcing a non-suitable plug-in unit into a case will break the relay
and may cause dangerous situations.
To install a plug-in unit into a case, first check that the lower handle is down in its
initial position and then push the unit into the case until the locks click; see the figure
below:
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