3WL air circuit breakers
3.1 Introduction and overview
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
31
Basic function ETU45B ETU76B
Load pick up ✓ ✓
Load shedding ✓ ✓
Leading signal overload trip 200 ms ✓ ✓
Temperature alarm ✓ ✓
Phase unbalance ✓ ✓
Instantaneous short-circuit trip ✓ ✓
Short-time delayed short-circuit trip ✓ ✓
Overload trip ✓ ✓
Neutral conductor trip ✓ ✓
Ground-fault protection trip ✓ (only with ground-fault
protection module)
✓ (only with ground-fault
protection module)
Ground-fault alarm ✓ (only with ground-fault
protection module)
✓ (only with ground-fault
protection module)
Auxiliary relay ✓ ✓
NSE00891
ETU fault ✓ ✓
* Set values for Ig
Size I/II
A 100 A
B 300 A
C 600 A
D 900 A
E 1200 A
Size III
A 400 A
B 600 A
C 800 A
D 1000 A
E 1200 A
3.1.4 Availability of the data on the CubicleBUS
Data library
Each data point from the data library of the SENTRON circuit breakers can only be
generated by a single module, the data source. If this data source (node) is available, the
data points assigned to the data source will also be available.
This availability is described and also communicated in the "property bytes". If a data source
(node) is not available, the data point will also not exist. This can also be seen in the
associated property byte. Chapter Data library (Page 175) provides a precise description of
the indivi
dual data points.
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