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L1 L2 L3 NPE
type 3 surge arrester type 3 surge arrester type 3 surge arrester

socket outlet

S-Schutz

DEHNflex

1 x DSA 230 LA Part No. 924 370 1 x DFL M 255 Part No. 924 396 1 x STC 230 Part No. 924 350
cable length ≥ 5 m
for cable ducts for flush-mounted systems for existing socket outlets
16 A
125 A 125 A

L1 L2 L3 N L1 L2 L3 N

DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD 275 DEHNguard DG MOD 275 sub-distribution board
fault indication
PE PE

with remote signalling contact:
1 x DG M TNS 275 Part No. 952 400 1 x DG M TNS 275 FM Part No. 952 405

type 2 surge arrester type 2 surge arrester

DEHNbloc ® M DEHNventil ®
Directly coordinated with
cable length ≥ 15 m Coordinated with DEHNguard ® type 2 and 3 Red/Line arresters
without additional cable length.
without additional cable length.

type 1 coordinated type 1 type 1
lightning current arrester lightning current arrester combined arrester
315 A 315 A 315 A

L/N L/N L/N L1 L1‘ L2 L2‘ L3 L3‘
L1 L1’ L2 L2’ L3 L3’
DEHNbloc DB 3 255 H
DEHNbloc DB M 1 255 FM DEHNbloc DB M 1 255 FM DEHNbloc DB M 1 255 FM DEHNventil DV MOD 255 DEHNventil DV MOD 255 DEHNventil DV MOD 255 main distribution board
fault indication
N‘/PEN N/PEN
N/PE(N) N/PE(N) N/PE(N) PEN

1 x DB 3 255 H Part No. 900 120 3 x DB M 1 255 FM Part No. 961 125 1 x DV M TNC 255 Part No. 951 300
1 x MVS 1 6 Part No. 900 815 alt. 1 x DV M TNC 255 FM Part No. 951 305
also available as
MEB alt. 3 x DB 1 255 H Part No. 900 222 alt. 3 x DB M 1 255 Part No. 961 120 1 x DV M TNS 255 Part No. 951 400
1 x MVS 1 6 Part No. 900 815 1 x MVS 1 6 Part No. 900 815 alt. 1 x DV M TNS 255 FM Part No. 951 405
L1 L2 L3 PEN Only required, if no fuse of the same or a lower nominal value is provided in the upstream system.
Figure 8.1.3.7 SPDs used in a TN system – Office building with separation of the PEN conductor in the main distribution board

224 LIGHTNING PROTECTION GUIDE www.dehn-international.com