Siemens Sentron 3VA Manual page 124

Applications
3.1 Use of the 3VA UL molded case circuit breakers in line protection
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
122
and t for overload protection (L)
r ld
and t for short-time delayed short circuit protection (S)
sd sd
for instantaneous short-circuit protection (I)
i
N
3VA molded case circuit breakers with UL and IEC certification
for neutral conductor protection (N)
Manual, 01/2019, L1V30435333-01