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PT 100
temperature sensor
UPS modem
0 – 20 mA
230/400 V
PC server
COM 2 COM 1
computer computer
M-bus box M-bus box
building 1
repeater
M-bus
230 V
building 2
No. Protection for… Surge protective device Part No.
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 DEHNconnect DCO SD2 MD 48 917 942
0 – 20 mA DEHNconnect DCO SD2 ME 24 917 921
PT 100 temperature sensor DEHNconnect DCO SD2 E 12 917 987
Figure 9.12.3 Protection concept for an M-bus system in buildings without external lightning protection system
328 LIGHTNING PROTECTION GUIDE www.dehn-international.com
