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No. in Fig. 9.33.6 Protection for Surge protective device Part No.
Power supply systems
DEHNventil M TT 255 951 310
Three-phase TN-S / TT system DEHNventil M TT 255 FM 951 315
DEHNventil ZP TT 255 900 391
DEHNventil M TNC 255 951 300
Three-phase TN-C system
DEHNventil M TNC 255 FM 951 305
DEHNventil M TN 255 951 200
Alternating current TN system
DEHNventil M TN 255 FM 951 205
DEHNventil M TT 2P 255 951 110
Alternating current TT system
DEHNventil M TT 2P 255 FM 951 115
Information technology systems
BXT ML4 BD 180 or 920 347
Telecontrol, telecommunication systems BXT ML2 BD 180 920 247
+ BXT BAS + 920 300
Measuring and control equipment
BXT ML4 BD EX 24 or 920 381
Intrinsically safe measuring circuits
and systems BXT ML2 BD S EX 24 920 280
+ BXT BAS EX + 920 301
Cathodic protection systems
Cathodic protection system,
protective circuit up to 12 A BVT KKS ALD 75 918 420
DEHNbloc M 1 150 FM 961 115
+ DEHNguard S 150 FM + 952 092
Cathodic protection system, + MVS 1 2 or + 900 617
protective circuit exceeding 12 A DEHNbloc M 1 150 961 110
+ DEHNguard S 150 + 952 072
+ MVS 1 2 + 900 617
Cathodic protection system,
sensor measuring circuit BVT KKS APD 36 918 421
Functionally isolated systems parts
EXFS 100 or 923 100
Insulating joints / insulating flanges
EXFS 100 KU 923 101
Equipotential bonding in hazardous areas
EX BRS 27 or 540 821
Connection of pipelines EX BRS 90 or 540 801
without ignition sparks EX BRS 300 or 540 803
EX BRS 500 540 805
Table 9.33.1 Recommended lightning equipotential bonding components according to Figure 9.33.6

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