Siemens SENTRON - Page 34

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