DEHNguard M TT 275


Product Summary

Modular surge arrester for use in TT and TN-S systems ("3+1" circuit)

  • Prewired complete unit consisting of a base part and plug-in protection modules
  • Energy coordination with other arresters of the Red/Line product family
  • High discharge capacity due to heavy-duty zinc oxide varistors/spark gaps
  • High reliability due to "Thermo Dynamic Control" SPD monitoring device
  • 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. 952310
SPD according to EN 61643-11 Type 2
SPD according to IEC 61643-1/-11 Class II
Nominal a.c. voltage (UN) 230/400 V
Max. continuous operating a.c. voltage [L-N] (UC) 275 V
Max. continuous operating a.c. voltage [N-PE] (UC) 255 V
Nominal discharge current (8/20 µs) (In) 20 kA
Max. discharge current (8/20 µs) (Imax) 40 kA
Lightning impulse current (10/350 µs) [N-PE] (Iimp) 12 kA
Voltage protection level [L-N] (UP) ≤ 1.25 kV
Voltage protection level [L-N] at 5 kA (UP) ≤ 1 kV
Voltage protection level [N-PE] (UP) ≤ 1.5 kV
Follow current extinguishing capability [N-PE] (Ifi) 100 Arms
Response time [L-N] (tA) ≤ 25 ns
Response time [N-PE] (tA) ≤ 100 ns
Max. mains-side overcurrent protection 125 A gL/gG
Short-circuit withstand capability for max. mains-side overcurrent protection 50 kArms
Temporary overvoltage (TOV) [L-N] (UT) 335 V / 5 sec.
Temporary overvoltage (TOV) [N-PE] (UT) 1200 V / 200 ms
TOV characteristic withstand
Operating temperature range (TU) -40 °C...+80 °C
Operating state/fault indication green / red
Number of ports 1
Cross-sectional area (min.) 1.5 mm2 solid/flexible
Cross-sectional area (max.) 35 mm2 stranded/25 mm2 flexible
For mounting on 35 mm DIN rails acc. to EN
Enclosure material thermoplastic, red, UL 94 V
Place of installation indoor installation
Degree of protection IP 20
Capacity 4 module(s), DIN 43880
Approvals KEMA, VDE, UL, VdS
Weight 476 g
GTIN 4013364108479
PU 1 pc(s)