A040166
Fig. 4.4.2.-1
Detaching a plug-in unit from the case
Before fitting a relay plug-in unit into a relay case, check that the unit
and the case have the same order number.
The order number of the case is printed on the bottom plate inside the case.
However, if a substitute plug-in unit has to be used instead of the original unit,
ensure that at least the first 10 characters in the order numbers of the case and the
plug-in unit are identical, as in the following example:
Order number of the relay case
REU610CVVHCHP XX
Order number of the plug-in unit
REU610CVVHCHR XX
However, it is highly recommended that all characters in the order number of the
substitute plug-in unit, except for those indicating a spare part, should match the
ones of the case. Otherwise, it may result in loss of significant functionality in the
application.
The relay features a built-in mechanical coding system which allows that a plug-in
unit with voltage or current measuring inputs only can be plugged into a
corresponding case. This helps to prevent dangerous situations from arising in case a
non-suitable plug-in unit is fitted into a relay case.
Forcing a non-suitable plug-in unit into a case breaks the relay and may
cause dangerous situations.
When installing a plug-in unit into a case:
1. Check that the handle is down in its initial position.
2. Push the unit into the case until the locks click; see Fig. 4.4.2.-2.
46
REU 610
REU 610
Voltage Protection Relay
Operator's Manual
1MRS755770
