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ABB REL 551 2.3 Series Installation And Comissioning Manual page 48

Line differential protection terminal
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42
Energising the terminal
Optical connector
for local PC
)LJXUH  ([DPSOH RI WKH ORFDO +0, IRU LQ WKLV H[DPSOH 5(/ 
LEDs
green yellow red
5HDG\
6WDUW
7ULS
5(/  9HU 
& 4XLW
( (QWHU PHQX
C
E
&KDSWHU 
(QHUJLVLQJ WKH WHUPLQDO
Liquid Crystal Display
four rows
16 characters/row
Push buttons
en00000422.vsd
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