Data Sheet for Product

14 / 16
Siemens Room units with 2-wire interface CB2N3261en_03
2020-01-22
Technical data
Supply voltage
Operating voltage
The room unit receives its power from the
connected controller, via the 2-wire interface
(SELV, according to HD384)
DC 21...30 V
Power consumption (from controller) Max. 0.31 VA
Operating data Measuring element NTC resistance sensor
Measuring range 0...40 °C
Thermal time constant (sensor) Approx 15 s
Measuring accuracy (5…30 °C) ±1.0 K
Measuring accuracy (25 °C) ±0.5 K
Display Type Segment LCD
Functions displayed Set point adjustment
– Operating mode
– Manually selected fan speed
– Control sequence
Time display
– Time and weekday setting
Parameter setting (only when selected)
Interfaces Type of interface between controller and room unit 2-wire interface KNX
Number of HMI-SG connected to a controller
without additional power supply
6
Baud rate 9.6 kbps
Cable connections Connection terminals (screw terminals) Solid or stranded conductors
0.8…2.5 mm
2
Cable type 2-core, twisted pair, unscreened
Max. distance between 2 units
700 m
Housing protection Protection standard to EN 60529 IP 30
Protection class Insulation protection class III
Ambient conditions IEC 60721-3 Normal operation Transport
Ambient air conditions Class 3K3 Class 2K3
Temperature 5...40 °C -25...70 °C
Humidity <85% r.h. <93% r.h.
Mechanical conditions Class 3M1 Class 2M2
Industry standards EU Conformity (CE) CB1T3942xx
Environmental compatibility
The product environmental declaration CB1E3261 contains data on environmentally
compatible product design and assessments (RoHS compliance, materials composition,
packaging, environmental benefit, disposal).
Listings
UL916, UL873
CSA C22.2M205
Dimensions See "Dimensions"
Color
Front housing, rear housing, key buttons
RAL9003 – signal white
Weight Excluding packaging 108 g