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PT 100
UPS modem temperature sensor
0 – 20 mA
230/400 V
PC server
COM 2 COM 1
computer computer
M-bus box M-bus box
building 1
repeater
230 V
building 2
No. Protection for… Surge protective device Part No.
Selection of combined arresters according to the system configuration
(in the main distribution board next to the entrance point into the building)
Three-phase TN-C system DEHNventil DV M TNC 255 951 300
Three-phase TN-S system DEHNventil DV M TNS 255 951 400
Three-phase TT system DEHNventil DV M TT 255 951 310
Surge protective devices for the voltage supply
Three-phase TN-S system DEHNguard DG M TNS 275 952 400
Three-phase TT system DEHNguard DG M TT 275 952 310
Alternating current TN system DEHNguard DG M TN 275 952 200
Alternating current TT system DEHNguard DG M TT 2P 275 952 110
Surge protective devices for signal interfaces
M-bus BLITZDUCTOR XT BXT ML2 BD S 48 + BXT BAS base part 920 245 + 920 300
0 – 20 mA BLITZDUCTOR XT BXT ML2 BE S 24 + BXT BAS base part 920 224 + 920 300
PT 100 temperature sensor BLITZDUCTOR XT BXT ML2 BE S 5 + BXT BAS base part 920 220 + 920 300
Figure 9.12.2 Protection concept for an M-bus system in buildings with external lightning protection system
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