Siemens SENTRON VL Series

Zone Selective Interlocking
5.2 Examples
3WL/3VL circuit breakers with communication capability - PROFIBUS
System Manual, 03/2011, A5E01051353-02
115
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5.2.2.6 Wiring example
The example shows ZSI wiring and the set delay times in a mixed system with 3WL and
3VL.
Grading level 2 is a coupling switch. Coupling switches are treated as separate grading
levels and receive their own delay time.