Description
2.6 Possible uses and portfolio
3VA27 molded case circuit breakers & 3WL10 air circuit breakers
Manual, 10/2018, L1V30499596002-01
29
The 3VA27 molded case circuit breaker or 3WL10 air circuit breaker as a motor starter protector
The ETUs of the 6-series can also be used for motor protection applications. For this
purpose, these ETUs provide the following setting parameters for protecting motors:
● Deactivation of the instantaneous short-circuit protection "S"
Short-time-delayed short-circuit protection
S Protection function can be ena-
bled/disabled
●
The short-time-delayed short-circuit protection is not required for motor protection
applications because no discrimination is required for coordination with downstream circuit
breakers.
● Selection and parameterization of the setting options (current and time) for instantaneous
short-circuit protection for the switch-on phase (inrush adaptation) according to the
application.
Instantaneous short-circuit protection INST
INST Switchover to alternative operating val-
ues with instantaneous short-circuit
current during the switch-on phase (in-
rush adaptation, start-up function)
●
Default value: OFF
Switch over to ON
Setting range for duration t during the
switch-on phase
0.10 to 30 s (in steps of 0.01)
Setting range I
i
= I
n
x … during the
switch-on phase
1.5 to 15 (in steps of 0.1)
● Setting option phase unbalance I
nba
I
nba
Protection function can be ena-
bled/disabled
●
Default value: OFF
Setting range I
nba
2 to 90% (in steps of 1%)
Setting range of the delay time t
nba
for phase current unbalance
0.50 to 60 s (in steps of 0.5)
Enabling/disabling of tripping on phase
current unbalance
On "OFF", a message is output on the
display or via the communication inter-
●
Default value: OFF
Switch over to ON
● Setting the trip class T
c
or the tripping time T
p
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