Applications
3.3 Motor protection applications of 3VA molded case circuit breakers
3VA molded case circuit breakers with IEC certificate
Manual, 03/2019, A5E03603177010-03
155
3.3.3
ETU350M electronic trip unit
Motor protection - function LSI
The ETU350M electronic trip unit features:
●
Adjustable parameter setting I
r
for overload protection (L)
●
Adjustable parameter setting I
sd
for short-time delayed short circuit protection (S)
●
Fixed parameter setting t
sd
for short-time delayed short circuit protection (S), t
sd
= 0.03 s
●
Fixed parameter setting I
i
for short-circuit protection (I), I
i
= 15 x I
r
●
Adjustable parameter setting T
c
for the trip class
●
Fixed parameter setting for phase unbalance of 40%
●
Permanently active thermal memory, cannot be deactivated
ETU350M parameters
