ABB RET 54 Series Technical Reference Manual, General page 65

1MRS755225 Transformer Terminal
Technical Reference Manual, General
The following values are recommended for the resistor R
below:
Operating voltage Uc
48 V DC
60 V DC
110 V DC
220 V DC
CBPOS_open
TCS blocking
Fig. 5.1.11.-1 Operating principle of the trip-circuit supervision (TCS), without
an external resistor. The TCS blocking switch is set, blocking the
TCS1 when the circuit breaker is open. The terminal numbers are
related to HSPO1.
Shunt resistor R
ext

1.2 k , 5 W

5.6 k , 5 W

22 k , 5 W

33 k , 5 W
RET 54_
in Figure 5.1.11.-1
ext
TCSclose_b
65