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Surge Arrester – Type 1

Surge Protection Device FLP25B-275/1

Integral housing lightning current and surge arrester for protecting power supply system against surges.

  • Prewired spark-gap-based type 1 lightning current and surge arrester
  • Maximum system availability due to RADAX Flow follow current limitation
  • Capable of protecting terminal equipment
FLP25B-275-1-Surge Protection Device
Basic circuit diagram

Technical data

SPD according to EN 61643-11 / IEC 61643-11type 1 / class I
Nominal a.c. voltage Un275 V AC (48/62 Hz)
Max. continuous operating a.c. voltage Uc320 V AC (48/62 Hz)
Lightning impulse current (10/350μs) Iimp25 kA
Voltage Protection level Up2,0 kV
Response time tA100 ns
Follow current extinguishing capability Ifi50 kArms
Max. backup fuse (L) up to IK = 50 kArms315 A gL/gG
Max. backup fuse (L-L’)125 A gL/gG
Temporary overvoltage (TOV) [L-N] (UT) – Characteristic440 V / 120 min. – withstand
Range of operating temperatures (TU)-40/+80°C
Operating state / fault indication
Number of ports1
Cross-sectional area (L1, L1′, L2, L2′, L3, L3′, N, N’, PE) (min.)10 mm2 solid /flexible
Cross-sectional area (L1, L2, L3, N, PE) (max.)50 mm2 stranded / 35 mm2 flexible
Cross-sectional area (L1′, L2′, L3′, N’, PE) (max.)35 mm2 stranded / 25 mm2 flexible
For mounting on35 mm DIN rail acc. to EN 60715
Enclosure materialthermoplastic
Place of installationindoor installation
Degree of protectionIP20
Capacity2 module(s), DIN 43880
Type of remote signalling contact
a.c switch capacity
d.c switch capacity


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