DEHNventil M TT 255

951310
Dvmtt255

Product Summary

Modular combined lightning current and surge arrester for protecting TT and TN-S systems ("3+1" circuit) against surges

  • Prewired spark-gap-based combined lightning current and surge arrester consisting of a base part and plug-in protection modules
  • Maximum system availability due to RADAX Flow follow current limitation
  • No tripping of 20 A gL/gG fuses up to short-circuit currents of 50 kArms
  • Discharge capacity up to 100 kA (10/350 µs)
  • Capable of protecting terminal equipment
  • Operating state/fault indication by indicator flag in the inspection window
  • Easy replacement of protection modules without tools due to module locking system with module release button
  • Vibration and shock-tested according to EN 60068-2

Product Specifications

Part No. 951310
SPD according to EN 61643-11 / IEC 61643-1/-11 Type 1 / Class 1
Energy coordination with terminal equipment Type 1 + Type 2
Energy coordination with terminal equipment (≤ 5m) Type 1 + Type 2 + Type 3
Nominal a.c. voltage (UN) 230 / 400 V
Max. continuous operating a.c. voltage (UC) 255 V
Lightning impulse current (10/350 µs) [L+N-PE] (Itotal) 100 kA
Specific energy [L+N-PE] (W/R) 2.50 MJ/ohms
Lightning impulse current (10/350 µs) [L-N]/[N-PE] (Iimp) 25 / 100 kA
Specific energy [L-N]/[N-PE] (W/R) 156.25 kJ/ohms / 2.50 MJ/ohms
Nominal discharge current (8/20 µs) (In) 25 / 100 kA
Voltage protection level [L-N]/[N-PE] (UP) ≤1.5 kV / ≤1.5 kV
Response time (tA) ≤100 ns
Follow current extinguishing capability [L-N]/[N-PE] (Ifi) 50 kArms / 100 Arms
Follow current limitation/Selectivity no tripping of a 20 A gL/gG fuse up to 50 kA
Max. backup fuse (L) up to IK = 50 kArms 315 A gL/gG
Max. backup fuse (L-L') 125 A gL/gG
Temporary overvoltage (TOV) [L-N] (UT) 440 V / 5 sec.
Temporary overvoltage (TOV) [N-PE] (UT) 1200 V / 200 ms
TOV characteristic withstand
Operating temperature range [parallel]/[series] (TU) -40°C...+80°C / -40°C...+60°C
Operating state/fault indication green / red
Number of ports 1
Cross-sectional area (L, L', N, N', PE, 9) (min.) 10 mm2 solid/flexible
Cross-sectional area (L, N, PE) (max.) 50 mm2 stranded/35 mm2 flexible
Cross-sectional area (L', N', 9) (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 6 module(s), DIN 43880
Approvals KEMA, VDE, UL, VdS
Type of remote signalling contact  
a.c. switching capacity  
d.c. switching capacity  
Cross-sectional area for remote signalling terminals  
Extended technical data: Use in installations with prospective short-circuit currents of more than 50 kA
- Maximum prospective short-circuit current 100 kArms (220 kApeak)
- Limitation/extinction of mains follow currents up to 100 kArms (220 kApeak)
- Max. backup fuse (L) up to IK = 100 kArms 315 A gL/gG
Weight 1.31 kg
GTIN 4013364108172
PU 1 pc(s)

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