Siemens SENTRON 3VA1 - Page 129

Applications
3.2 Line protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
127
Electronic trip unit ETU350 LSI
ETU350 LSI 3-pole:
ETU350 LSI 4-pole:
Line protection - function LSI
The ETU350 electronic trip unit has:
● Adjustable parameter settings I
r
and t
r
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
● Permanently active thermal memory, cannot be deactivated
ETU350 parameters: