NL1-25B 3P Surge Protection Device

NL1-25B 3P Surge Protection Device

Integral housing combined lightning current and surge arrester for protecting three-phase TT and TN-S systems (“3+1” circuit)against surges.

•      Coordinated spark-gap-based lightning current and surge arrester
•      Maximum systems availability due to RADAX Flow follow current limitation
•     Capable of protecting terminal equipment

Technical data
Type	NL1-25B-275/3
SPD according to EN 61643-11 / IEC 61643-11	type 1 + type 2 / class I + class II
Energy coordination with terminal equipment (< 5m)	type 1 + type 2
Nominal a.c. voltage (Un)	230 / 400 V AC (50/60 Hz)
Max. continuous operating a.c. voltage (Uc)	275 V AC (50/60 Hz)
Lightning impulse current (10/350μs) [L1+L2+L3+N-PE] (Itotal)	100 kA
Specific energy [L1+L2+L3+N-PE] (W/R)	2,5 MJ/ohms
Lightning impulse current (10/350μs) [L, N-PE] (Iimp)	25 kA
Specific energy [L, N-PE] (W/R)	156,25 kJ/ohms
Nominal discharge current (8/20μs) [L, N-PE]/[L1+L2+L3+N-PE](In)	25 kA / 100 kA
Voltage protection level [L-PE]/[N-PE] (Up)	1,5 kV / 1,5 kV
Follow current extinguishing capability a.c. (Ifi)	50 kArms
Follow current limitation / Selectivity	no tripping of a 20 A gL/gG fuse up to 50 kArms(prosp.)
Response time (tA)	< 100 ns
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) – Characteristic	530 V / 120 min. – withstand
Range of operating temperatures [parallel] / [series] (TU)	-40…+80°C / -40…+60°C
Operating state / fault indication	–
Number of ports	1
Cross-sectional area (L1, L1′,L2, L2′, L3, L3′, N, N’, PE, 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 on	35 mm DIN rail acc. to EN 60715
Enclosure material	thermoplastic
Place of installation	indoor installation
Degree of protection	IP20
Capacity	8 module(s), DIN 43880
Approvals	CE
Structure Chart