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L1 L2 L3 N PE
type 3 surge arrester type 3 surge arrester type 3 surge arrester

socket outlet
Überspannungsschutz

0 ÜBERSPANNUNGSSCHUTZ LINE FILTER NETZFILTER
1 SURGE PROTECTOR DEFECT FUNCTION FREQUENCY FILTER FREQUENZFILTER
PROTECTOR
1 x NSM PRO EW Part No. 924 342 1 x DPRO 230 F Part No. 909 240 1 x SFL PRO 6X Art.-Nr. 909 250
1 x DPRO 230 Part No. 909 230
cable length ≥ 5 m
16 A
125 A 125 A
L1 L2 L3 L1 L2 L3

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
PEN PEN

with remote signalling contact:
1 x DG M TNC 275 Part No. 952 300 1 x DG M TNC 275 FM Part No. 952 305

type 2 surge arrester type 2 surge arrester

DEHNbloc ® M DEHNventil ®
Directly coordinated with
Coordinated with DEHNguard ®
cable length ≥ 15 m without additional cable length. type 2 and 3 Red/Line arresters
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
main distribution board
L/N L’/N’ L/N L’/N’ L/N L’/N’ L/N L/N L/N L1 L1‘ L2 L2‘ L3 L3‘

DEHNbloc DB H MOD 255 DEHNbloc DB H MOD 255 DEHNbloc DB H MOD 255 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
fault indication
N/PE(N) N/PE(N) N/PE(N) N/PE(N) N/PE(N) N/PE(N) PEN

3 x DBH M 1 255 Part No. 961 122 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 1 x MVS 1 6 Part No. 900 815
MEB alt. 1 x DB 3 255 H Part No. 900 120 alt. 3 x DB M 1 255 Part No. 961 120 alt. 1 x DV M TNC 255 FM Part No. 951 305
1 x MVS 1 6 Part No. 900 815
L1 L2 L3 PEN Only required, if no fuse of the same or a lower nominal value is provided in the upstream system.
Figure 8.1.3.8 SPDs used in a TN system – Office building with separation of the PEN conductor in the sub-distribution board

www.dehn-international.com LIGHTNING PROTECTION GUIDE 225