Product Detail
NXU-II Low-Voltage Surge Protective Device
Function: Protection against lightning and transient overvoltage in low-voltage power systems
Standard Compliance: IEC/EN 61643-11
Certifications: CE, RoHS
Test Class: Class II
Maximum Discharge Current (Imax): 20kA / 40kA
Nominal Discharge Current (In): 10kA / 20kA
Maximum Continuous Operating Voltage (Uc): 255V, 275V, 320V, 385V, 440V
Voltage Protection Level (Up): 1.2kV – 2.0kV
Rated Frequency: 50/60Hz
Applicable Grounding Systems: TT, TN-S, TN-C, IT
Short-Circuit Current Withstand Capacity: 5kA
Protection Modes: L-PE/N-PE and L-N/N-PE
Poles Available: 1P, 1P+N, 2P, 3P, 3P+N, 4P
Backup Fuse Rating:
20kA model → 63A (gL/gG type)
40kA model → 125A (gL/gG type)
Transient Overvoltage (TOV) Withstand:
Uc 275V / 320V → UT = 336V (5s), fault mode UT = 442V (120min)
Uc 385V / 440V → fault mode UT = 442V (120min)
Mechanical Design: Modular pluggable cartridge + base
Fault Indication: Red visual signal on deterioration
Optional Feature: Remote signaling contact (model NXU-II/F)
Terminal Connection Capacity:
M4: ≤10mm² (torque 1.5N·m)
M5: ≤16mm² (torque 2.0N·m)
Protection Degree: IP20
Mounting: DIN rail 35mm (EN 60715)
Dimensions (mm):
1P / 1P+N / 2P: 18W × 90H × 65D
3P / 3P+N / 4P: 36W × 90H × 65D
Weight: Approx. 150–300g (depending on poles)
Installation Altitude: ≤2000m
The NXU-II Low-Voltage Surge Protective Device (SPD) provides dependable protection against lightning strikes and transient overvoltages in electrical systems. Designed for 230/400V AC networks, it supports Class II surge protection with a maximum discharge current of up to 40kA. Built with a modular, pluggable design, the NXU-II ensures easy maintenance and high reliability. Certified to IEC/EN 61643-11 and CE, RoHS standards, it is ideal for residential, commercial, and industrial installations requiring stable surge suppression.