Siemens 3VA1 100 A Manual page 117

Electronic trip units ETU550 LSI and ETU850 LSI
ETU550 LSI 3-pole and 4-pole units:
ETU850 LSI 3-pole and 4-pole units:
Line protection - function LSI
The electronic trip units ETU550 and ETU850 have:
● adjustable parameter settings I
● adjustable parameter settings I
● adjustable parameter setting I
● With 4-pole versions: adjustable parameter setting I
can be activated optionally for 3-pole versions
3VA molded case circuit breakers
Manual, 04/2015, A5E03603177010-02
3.1 Line protection applications of 3VA molded case circuit breakers
and t for overload protection (L)
r r
and t for short-time delayed short circuit protection (S)
sd sd
for instantaneous short-circuit protection (I)
i
for neutral conductor protection (N)
N
Applications
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