Siemens Sentron 3VA - Page 76

Description
2.5 Protection functions
3VA molded case circuit breakers with UL and IEC certification
74 Manual, 01/2019, L1V30435333-01
N Neutral conductor protection
1)
With rated current I
n
≤ 40 A: I
N
= 40 % … 100 % I
n
2)
With rated current I
n
≤ 100 A: I
N
= 20% … 100% I
n
3)
Starting from rated current I
n
≥ 100 A
4)
Dependent on circuit breaker frame size and rated current
Parameters of the neutral conductor protection function
● Tripping current I
N
:
Adjustable as a proportion of the current setting (I
r
) for overload protection
● Tripping delay:
Corresponds to the delay (t
r
) for overload protection
● Tripping current of the short-time delayed short-circuit protection:
Corresponds to the short-time delayed short-circuit protection (I
sd
)
● Tripping delay:
Corresponds to the delay setting for short-time delayed short-circuit protection (t
sd
)
● Instantaneous short-circuit protection:
Corresponds to the tripping current (I
i
) for instantaneous short-circuit protection