Logical Selectivity; Connection Terminals - LEGRAND 0 281 64 Mode D'emploi

Protection unit

10. Logical selectivity

The feature logical selectivity is not supported by PU versions ref . 0 281 67 / 0 281 68 .
For the General indications and requirements about the function Logical Selectivity refer to standard
Logical Selectivity Guide .

Connection terminals:

Please refer to breaker installation manual .
Activation:
The input/output connections for logical selectivity can be activated by modifying the protection unit
settings navigating in menu as specified below:
Setting ➔ Relay Settings ➔ Function Settings ➔ choose "SEL IN" in contact list ➔ select "ON" in the
function list (not required for the last downstream selectivity level - D)
Setting ➔ Relay Settings ➔ Function Settings ➔ choose "SEL OUT" in contact list ➔ select "ON" in
the function list (required for all selectivity levels - A/B/C/D)
Wiring and Supply:
Please remind the protection unit always needs to be supplied by a specific external module
ref . 0 281 72 in order to provide a correct working of logic selectivity .
In addition,the input of the logic selectivity (DI) also needs to be supplied at 24V DC voltage on its
terminals . In detail,the positive polarity of supplier +( 24V) must be connected to terminal H11 .
This supply can be provided by the same module ref . 0 281 72 which supplies the PU .
On the contrary, the output of the logic selectivity (DO) doesn't require an additional supply .
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