Siemens Sentron 3VA - Page 111

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
109
Electronic trip unit ETU330 LIG
ETU330 LIG 3-pole:
ETU330 LIG 4-pole:
Line protection - function LIG
The electronic trip unit ETU330 has:
● Adjustable parameter settings I
r
and t
ld
for overload protection (L)
● Adjustable parameter setting I
i
for instantaneous short-circuit protection (I)
● Adjustable parameter settings I
g
and t
g
for ground-fault protection (G)
● With 4-pole versions only: Neutral conductor protection (N) which can be deactivated
ETU330 parameters:
The parameters are selected with the setting knob. The diagram below shows an example of
the possible selections with setting knob I
r
.
The values for the respective setting are listed in the following tables.