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Table 13: Values recommended for the external resistor R
ext
Operating voltage U
c
Shunt resistor R
ext
48 V DC
10 kΩ, 5 W
60 V DC
22 kΩ, 5 W
110 V DC
33 kΩ, 5 W
220 V DC
68 kΩ, 5 W
Due to the requirement that the voltage over the TCSSCBR contact must be 20V or higher, the
correct operation is not guaranteed with auxiliary operating voltages lower than 48V DC because
of the voltage drop in the R
ext
and operating coil or even voltage drop of the feeding auxiliary
voltage system which can cause too low voltage values over the TCSSCBR contact. In this case,
erroneous alarming can occur.
At lower (<48V DC) auxiliary circuit operating voltages, it is recommended to use the circuit
breaker position to block unintentional operation of TCSSCBR. The use of the position indication
is described earlier in this chapter.
1MRK 505 287-UUS B
Section 9
Secondary system supervision
Busbar protection REB650
113
Application manual
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