Siemens SENTRON 3VA1 - ETU860 M Electronic Trip Unit

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
161
3.3.4.2
ETU860M electronic trip unit
Motor protection - function LSIG
The ETU860M 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
● Adjustable parameter setting I
i
for short-circuit protection (I)
● Adjustable parameter settings I
g
and t
g
for ground-fault protection (G)
● Adjustable parameter setting T
c
for the trip class or tripping time T
p
● Adjustable parameter setting for phase unbalance from 5 to 50% / OFF, t
unbal
● Adjustable parameter settings I
b
and t
b
for blocking protection
● Adjustable parameter settings I
<<
and t
<<
for idle running protection