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
113
Electronic trip unit ETU350 LSI
ETU350 LSI 3-pole:
ETU350 LSI 4-pole:
Line protection - function LSI
The electronic trip unit ETU350 has:
●
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)
●
Fixed parameter setting I
i
for instantaneous short-circuit protection (I)
●
With 4-pole versions only: Neutral conductor protection (N) which can be deactivated
ETU350 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.
