B20M Vseries is the encapsulated gas discharge tube Type 2 according to EN 61643-11 and IEC 61643-11. These arresters are recommended for use in the Lightning Protection Zones Concept at the boundaries of LPZ 1-2 (according to IEC 62305 and EN 62305), in the power supply lines, which are operated as TN-S and TT systems, where they provide the equipotential bonding between N and PE in the connections of 1+1 or 3+1. Thanks to the high insulation resistance at the release condition, the GDT will not cause the activation of RCD.

Note : For IT power supply networks use a special variant of gas dicharge tubes – find more in the catalogue’s annex for IT networks. 

The marking M specifies a type of construction with removable module. 

The marking of DS specifies a version with remote monitoring.

Internal wiring diagram
Internal wiring diagram
Dimension drawing
Dimension drawing
Installation diagram
Installation diagram Počet fotek v galerii: 2
Test class according to EN 61643-11:2012 and IEC 61643-11:2011 TYP2, CLASS II
Network type TN-S
Maximum continuous operating voltage UC 255 V AC
Impulse discharge current for class I test (10/350) Iimp 20 kA
Charge Q 10 As
Specific energy for class I test W/R 100 kJ/Ω
Nominal discharge current for class II test (8/20) In 20 kA
Voltage protection level at Iimp Up < 1,3 kV
Temporary overvoltage (TOV) UT 1200 V/0,2 s
Response time tA < 100 ns
Follow current interrupt rating Ifi 100 Arms
LPZ 1-2
Housing material Polyamid PA6, UL94 V-0
Degree of protection of enclosure IP20
Operating temperature ϑ -40°C ... +80 °C
Cross-section of the connected conductors (at tightening moment of clamps 3 Nm) 25 mm2 (solid)
16 mm2 (wire)
Method of assembly DIN rail 35 mm
Failure signalisation (S) green - ok / red - failure
Potential free signal contact (DS) (recommended cross-section of remote monitoring max.1 mm2) AC: 250 V / 0,5 A, DC: 250 V / 0,1 A
Lifetime min.100 000 h
Weight m 76 g
Article number 27 048
Installation instructions (1.13 MB)
2D model (517.54 KB) for registered only
3D model (654.4 KB) for registered only
Certificates (84.81 KB) for registered only
EC declaration of conformity (81.36 KB) for registered only