Siemens SENTRON 3WA1 Manual page 206

Applications
3.2 Using the 3WA circuit breaker for motor protection
Non-tripping of the circuit breaker due to the inrush peak current of electric motors and
simultaneous protection in case of rotor blocking can be achieved by setting tripping
time t
Protective function
S: Delayed short circuit protection ST
Tripping
Current setting I
sd
Tripping time t
sd
Characteristic ST curve
Reference point I
ST ref
Intermittent detection
This can be set using the operating keys on the display or with the help of the SENTRON
powerconfig configuration software via Bluetooth or communication. For protection
parameter set A, the setting is made under display menu item 3.1.3 of the ETU600.
204
of the delayed short-circuit protection ST to 0.02 s.
sd
Setting range for parameter sets A
and B
Can be switched on/off
0.6 x I ... 0.8 x I
n
0.02 ... 0.4 s
I t / I t
0 2
6 ... 12 x I
r
Can be switched on/off
Settings with rotary switch only
possible in parameter set A
1.5 / 2 / 2.5 / 3 / 4 / 5 / 6 / 8 / 10 x I
cw
At I
0.08 / 0.15 / 0.22 / 0.3 / 0.4 s
At I
0.1 / 0.2 / 0.3 / 0.4 s
Equipment Manual, 02/2023, 92310000002-06
t = OFF:
2
t = ON:
2
3WA1 air circuit breaker
r