Siemens SENTRON 3WA1 - Digital Input and Output

Description
2.4 ETU300 electronic trip unit
3WA1 air circuit breaker
82 Equipment Manual, 02/2023, 92310000002-06
2.4.3.2 Digital input and output
The electronic trip unit ETU300 has one digital input and one digital output.
The input responds to a 24 V signal with signal level HIGH and activates the
maintenance mode DAS+.
The floating output is a normally open contact (NO). It is activated when the
maintenance mode DAS+ is active.
Technical specifications and connection
The connection is made at the secondary disconnect terminal system of the 3WA air
circuit breaker.
Digital input ETU-IN
Connection
X8-5 and X8-6
Number of inputs
1
SELV/PELV suitable
✓
Rated voltage
24 V DC ± 20%
Voltage value for reliable detection of a "1
signal":
≥15 V DC
Current consumption at signal voltage of >15 V
DC
< 10 mA
Minimum signal duration
100 ms
Floating output ETU-OUT
Connection
X8-7 and X8-8
Number of outputs
1
Contact
Normally open contact
(NO)
Rated voltage
24 V DC ±20%
Maximum switching current
0.1 A at 24 V DC
Maximum continuous current
0.1 A at 24 V DC
• The digital input is designed for a control supply voltage of 24 V DC.
No polarity is specified at the DI ETU.0 and DI ETU.1 input terminals.
• The digital outputs DO ETU.0 and DO ETU.1 are designed for 24 V DC and as a
normally open contact (NO).
If the power to be switched exceeds the breaking capacity of the output, a suitable
coupling relay must be used.