3WL air circuit breakers
3.7 External current consumption with CubicleBUS
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
83
Example:
If a rating plug 630 A is used with a 1000 A switch, the accuracy for the full-scale value is
1000 A.
ETU45B
Display With communication
Without metering function PLUS ± 10% ± 10%
With metering function PLUS ± 10% ± 1%
1
ETU76B
Display With communication
Without metering function PLUS ± 10% ± 10%
With metering function PLUS ± 1%
1
± 1%
1
1
If a metering function PLUS is retrofitted, an accuracy of ± 3% is available, and this in turn is
oriented around the full-scale value.
3.7 External current consumption with CubicleBUS
3.7.1 Power required by a SENTRON WL with CubicleBUS
The SENTRON WL circuit breakers with CubicleBUS must also communicate and indicate
internally and externally, even when the main contacts are open. For this reason, it is
necessary here to connect an external power supply. The required power differs here
according to the degree of configuration and options used.
General information
The transformers for the SENTRON WL circuit breakers consist of two parts:
● Rogowski coils: supply the current values
● Energy transformers: supply the trip unit with energy
In the case of breakers without additional external supply, the trip units are already activated
with 80 A 3-phase or higher for size 1 and 2, and with 150 A 3-phase or higher for size 3,
and they monitor the power distribution.
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