Siemens SENTRON 3WA1 - Technical Specifications; Selecting the Power Supply

Description
2.8 Communication and system connection
3WA1 air circuit breaker
140 Equipment Manual, 02/2023, 92310000002-06
Note
Compatibility with legacy product
The CubicleBUS² applied in the 3WA circuit breaker is an enhanced development of the
CubicleBUS system applied in the 3WL circuit breaker. They are not compatible with
each other.
See also
Position signaling switch module for guide frame (Page 274)
2.8.1.2 Technical specifications
Designation
CubicleBUS
2
Required connection cable
Twisted pairs
Shielded and grounded at one end for EMC interference
Conductor cross-section
Solid
0.2 … 1.5 mm
2
/ 24 …16 AWG
Finely stranded/
with insulated conductor
end processing
0.2 … 1.5 mm
2
/ 24 …16 AWG
Length
Up to 9 m outside the circuit breaker
Terminating resistor
on the last device
120 Ω / 0.5 W
Installation type
Serial bus without spur lines
2.8.1.3 Selecting the power supply
When selecting the power supply, observe the following notes:
The type and number of modules determine the continuous current. The power supply
must be able to supply the starting current of all connected modules for a duration of
100 ms.
The power supply must meet the following requirements:
- DC power supply unit IEC 61558 SELV/PELV
- Rated supply voltage U
s
24 V DC
- Operating range U
s
±20%