Setting Range - Siemens SENTRON 3WA1 Manual

2.4.4.2

Setting range

The protective functions have adjustable and non-adjustable parameters. (For basic
settings on delivery from the factory, see Chapter Basic settings of the electronic trip
unit on delivery (Page 551)):
ETU300 LSI, ETU300 LSIG
Protective function
L: Overload protection LT
Tripping
Current setting I
r
Tripping time t at 6 x I
r r
Characteristic LT curve
Thermal memory
Cooling time constant
Phase failure detection
L: Overload protection LT, neutral conductor
Tripping
Current setting I
rN
S: Delayed short circuit protection ST
Tripping
Current setting I
sd
Tripping time t
sd
Characteristic ST curve
Reference point I
ST ref
I: Instantaneous short-circuit protection INST
Tripping
Current setting I
i
The setting is limited depending on the breaking capacity at rated operational voltage U
1)
ETU300 LSIG
Protective function
G: Ground-fault protection GF
Tripping
Method of ground-fault detection
Characteristic GF curve
Current setting I
g
Tripping time t
g
3WA1 air circuit breaker
Equipment Manual, 02/2023, 92310000002-06
Setting range and
unchangeable
parameters
activated
0.4 ... 1.0 x I
n
0.75 ... 25 s
I²t
activated
18 x t
r
activated
activated
1.0 x I
n
Can be switched on/off
0.08 ... 0.4 s
I t / I t
0 2
8 x I
r
activated
1.5 ... 15 x I
n
Maximum 0.8 x I
1)
cs
Setting range
activated
Residual
with LSIG option plug
with LSIG option plug
0.2 s
2.4 ETU300 electronic trip unit
Settings
0.4 / 0.5 / 0.6 / 0.7 / 0.75 / 0.8 / 0.85 / 0.9 / 0.95 /
1.0 x I
n
0.75 / 1 / 2 / 5 / 8 / 10 / 14 / 17 / 21 / 25 s
OFF / 1.5 / 2 / 2.5 / 3 / 4 / 5 / 6 / 8 / 10 x I
Maximum 0.8 x I
1)
cw
0.08 / 0.15 / 0.22 / 0.3 / 0.4 s
1.5 / 2 / 3 / 4 / 5 / 6 / 8 / 10 / 12 / 15 x I
Maximum 0.8 x I
1)
cs
Detection of the ground-fault current
through calculation of the summation
current in all phases of the N-conductor
I t
0
0.2 x I (min. 100 A, max. 1200 A)
n
Description
r
n
.
e
85