Siemens Sentron 3VA - Page 127

Applications
3.1 Use of the 3VA UL molded case circuit breakers in line protection
3VA molded case circuit breakers with UL and IEC certification
Manual, 01/2019, L1V30435333-01
125
Electronic trip units ETU556 LSI G (alarm-only) and ETU856 LSI G (alarm-only)
ETU556 LSI(G) 3-pole and 4-pole:
ETU856 LSI(G) 3-pole and 4-pole:
Line protection - function LSI(G)
The electronic trip units ETU556 and ETU856 have:
● Adjustable parameter settings I
r
and t
ld
for overload protection (L)
● Adjustable parameter settings I
sd
and t
sd
for short-time delayed short circuit protection (S)
● Adjustable parameter setting I
i
for instantaneous short-circuit protection (I)
● Adjustable parameter settings I
g
and t
g
for ground-fault alarm (G)
● With 4-pole versions: adjustable parameter setting I
N
for neutral conductor protection (N)
optionally available for 3-pole versions