Modular multipole Combined Lightning Current and Surge Arrester

Application-optimised and prewired type 1 and type 2 combined lightning current and surge arrester based on spark gap technology Space-saving arrester for compact and simply equipped electrical installations with reduced technical requirements For use in residential buildings and special applications (see brochure DS193) Capable of protecting terminal equipment Discharge capacity up to 50 kA (10/350 µs) Operating state / fault indication by green / red indicator flag in the inspection window High follow current extinguishing capacity (Ifi = 25 kArms)


DEHNshield TNC 255: Application-optimised combined lightning current and surge arrester for TN-C systems

DEHNshield TNS 255: Application-optimised combined lightning current and surge arrester for TN-S systems

DEHNshield TT 255: Application-optimised combined lightning current and surge arrester for TT and TN-S systems ("3+1" circuit)

DEHNshield TN 255: Application-optimised combined lightning current and surge arrester for single-phase TN systems

DEHNshield TT 2P 255: Application-optimised combined lightning current and surge arrester for single-phase TT and TN systems ("1+1" circuit)


The space-saving and application-optimised DEHNshield family offers various benefits provided by type 1 and type 2 spark-gap-based arresters such as the "wave breaker function" (WBF). This function and the associated reduction of the pulse time mitigate the energy of the lightning impulse current to an acceptable level for downstream protection stages or terminal equipment. Moreover, DEHNshield arresters are directly energy coordinated with other arresters of the Red/Line product family. Application-optimised DEHNshield combined lightning current and surge arresters combine lightning equipotential bonding up to lightning impulse currents of 50 kA (10/350 µs) and surge protection in a single device. This clearly distinguishes DEHNshield from varistor-based arresters of this application and performance class.

Due to their technical parameters, which are rated for use in simple and compact electrical installations, DEHNshield arresters are ideally suited for this application class. For this reason, they are a space-saving and application-optimised solution in particular for residential buildings. DEHNshield arresters also provide optimal protection in buildings without external lightning protection system where roof superstructures or overhead line supplies are installed. According to VdS 2031, it is advisable to use type 1 SPDs for these buildings. A detailed application description can be found in brochure DS193. No additional backup fuse is required if an installation is protected by backup fuses up to 160 A. If applications are not sufficiently defined, it is advisable to use DEHNventil. Fulfilling the most stringent technical requirements, DEHNventil provides sufficient protection at any time and is suitable for any application. The energy-coordinated arresters even allow to protect terminal equipment if the distance between DEHNshield and the loads is ≤ 5 m. Owing to their spark gap without venting means and low space requirements, application-optimised combined lightning current and surge arresters can be easily integrated into distribution boards. The follow-current-limiting spark gap technology ensures selectivity even in case of low-value fuses (35 A gL/gG), meaning that upstream fuses are not tripped by mains follow currents.

Busbars and pin-shaped terminals from DEHN + SÖHNE can be used for connecting DEHNshield to other DIN rail mounted devices. The type designation of DEHNshield allows to easily choose the right arrester for the relevant system configuration of the low-voltage consumer’s installation. The operating state / fault indicator of every protective path needs no power to operate and immediately shows the operating state of the arrester.

Due to their parameters and design, the DEHNshield devices can be installed even upstream of meter panels in low-voltage consumer's installations.


Type DSH TNC 255
Part No. 951 300
SPD according to EN 61643-11 / IEC 61643-11 type 1 + type 2 / class I + class II
Energy coordination with terminal equipment (≤ 5 m) type 1 + type 2 + type 3
Nominal a.c. voltage (UN) 230 / 400 V (50 / 60 Hz)
Max. continuous operating a.c. voltage (UC) 255 V (50 / 60 Hz)
Lightning impulse current (10/350 µs) [L1+L2+L3-PEN] (Itotal) 37.5 kA
Specific energy [L1+L2+L3-PEN] (W/R) 352.00  kJ/ohms
Lightning impulse current (10/350 µs) [L-PEN] (Iimp) 12.5 kA
Specific energy [L-PEN] (W/R) 39.06 kJ/ohms
Nominal discharge current (8/20 µs) [L-PEN]/[L1+L2+L3-PEN] (In) 12.5 / 37.5 kA
Nominal discharge current (8/20 µs) [L/N-PE]/[L1+L2+L3+N-PE] (In) l kA
Voltage protection level (UP) ≤ 1.5 kV
Follow current extinguishing capability a.c. (Ifi) 25 kArms
Follow current limitation / Selectivity no tripping of a 32 A gL/gG fuse up to 25 kArms (prosp.)
Response time (tA) ≤ 100 ns
Max. mains-side overcurrent protection 160 A gL/gG
Temporary overvoltage (TOV) [L-N] (UT) – Characteristic 440 V / 120 min. – withstand
Operating temperature range (TU) -40 °C ... +80 °C
Operating state / fault indication green / red
Number of ports 1
Cross-sectional area (L1, L2, L3, PEN) (min.) 1.5 mm2 solid / flexible
Cross-sectional area (L1, L2, L3, PEN) (max.) 35 mm2 stranded / 25 mm2 flexible
For mounting on 35 mm DIN rails acc. to EN 60715
Enclosure material thermoplastic, red, UL 94 V-0
Place of installation indoor installation
Degree of protection IP 20
Capacity 4 module(s), DIN 43880
Approvals KEMA, VDE, UL
Weight 386 g
GTIN 4013364133556
PU 1 pc(s)
Product Specifications (PDF)