Doc: 70-00-0792B V1.3, 20220830  © Vector Controls GmbH, Switzerland   Page 4-34 
Subject to change without notice   www.vectorcontrols.com 
2  Technical Specifications 
 
Screw terminals  
Wire 0.15…2.05 mm2 (AWG 26…14) 
Temperature range 
Accuracy 0…50°C 
0…50°C (32…122°F) 
0.5°C (1°F) 
Digital and temperature input 
Temperature range 
Temperature accuracy 
 
Selectable via parameter 
-20…60°C (-4…140°F) 
0.5°C (1°F) at 0…50°C (32…122°F) 
1.0°C (2°F) at <0°C (<32°F), >50°C (>122°F) 
Type & range of temperature sensor 
NTC (Sxx-Tn10): -40…140°C (-40…284°F) 
0…250 VAC, resistive load current 5A, inductive 2A 
Insulation strength 
between relays and system electronics 
between neighboring contacts 
 
2500V to EN 60 730-1 
2500V to EN 60 730-1 
2.B (micro-disconnection) 
Network 
(TRA-F121-A only) 
Hardware interface 
Max nodes per network 
Max nodes per segment 
RS485 in accordance with EIA/TIA 485 
247 
128  
Shielded Twisted Pair (STP) cable  
100 – 130 Ω  
The communication circuitry is isolated 
According Modbus manual (Modbus over serial 
line) 
Recommended maximum length per chain 
Modbus RTU (www.modbus.org) 
38400 baud rate, even parity, 1 stop bit 
Communication speed (baud rate) 
2400, 4800, 9600, 19200, 38400, 57600, 115200 
Modbus RTU protocol (8 data bits) 
no parity – 1 or 2 stop bits; 
even or odd parity – 1 stop bit 
Operation 
Climatic conditions 
Temperature 
Humidity 
To IEC 721-3-3 
class 3K5 
0…50 °C (32…122 °F) 
<85 % RH non-condensing 
Transport & storage 
Climatic conditions 
Temperature 
Humidity 
Mechanical conditions 
To IEC 721-3-2 and IEC 721-3-1 
class 3K3 and class 1K3 
0…50 °C (32…122 °F) 
<95 % RH non-condensing 
class 2M2 
Fire proof PC+ABS plastic (UL94 class V-0) 
Dimensions front part (H x W x D) 
Dimensions back part (H x W x D) 
88 x 88 x 16 mm (3.5 x 3.5 x 0.6 in) 
67 x 61 x 25 mm (2.6 x 2.4 x 1.0 in) 
Weight (including package) 
 
2.1  Product testing and certification 
 
Declaration of 
Conformity 
Information on the conformity of our products can be found on our website 
www.vectorcontrols.com on the corresponding product page under "Downloads".