Siemens SENTRON Configuration Manual page 34

Methods of implementing selectivity using circuit breakers
3.5 Zone selective interlocking
Example
A
E
- - Control wires
Figure 3-10
34
Signal output
Signal input
Zone selective interlocking combined with time selectivity
t Delay time of the I release
i
t Delay time setting of the short-time delay short-
sd
circuit release
t Shortened delay time (defined non-operation
ZSI
time)
Selectivity for 3VA molded case circuit breakers
Configuration Manual, 08/2016, A5E03603181010-01