50kA Ultra-High Current Four-Pole Full Protection, Premium Solution for Three-Phase Four-Wire Systems

Product Overview

The NPS01-FA50 AC 4P Surge Protective Device is the top model of the FA50KA series, designed for high-risk lightning areas and critical three-phase four-wire power systems.

Complying with IEC 61643-11 and GB/T 18802.11 standards, it adopts a four-pole independent structure. Each pole provides 50kA lightning impulse current capability, effectively protecting major facilities such as power substations, industrial plants, large buildings, and critical infrastructure.

Independent High-Capacity Graphite Gaps, Stable Performance Under Extreme Conditions

The device uses large-volume high-purity graphite spark gaps with independent protection for each pole. Even if one pole fails, the remaining protection circuits continue operating.

The advanced arc extinguishing technology quickly interrupts follow current after lightning discharge, achieving:

Zero leakage current
Zero power consumption
High energy withstand capability

High-purity copper conductors ensure excellent conductivity, low temperature rise, and long-term reliability under harsh operating conditions.

630A Backup Fuse Compatible, Ideal for Advanced Protection Systems

Technical features:

Nominal discharge current: 50kA (8/20μs)
Voltage protection level: Up ≤1.5kV
Response time: ≤100ns

The device supports coordination with 630A gG backup fuses and can be combined with downstream SPDs to build a complete multi-stage lightning protection system.

Equipped with dual-color status indicators and optional remote alarm output, it supports intelligent monitoring applications.

Operating temperature: -40℃ to +80℃
Installation: 35mm DIN rail
Cable size: 4-35mm²

Model	NPS01-FA50/275/4	NPS01-FA50/320/4	NPS01-FA50/385/4
SPD Test Category	Type1/ClassI (EN/IEC61643-11, GB/T18802.11)
Maximum Continuous Operating Voltage Uc (Current Type: a.c.)	275V	320V	385V
Lightning Impulse Current (10/350μs) [L-PE, N-PE] Iimp	50kA	50kA	50kA
Nominal Discharge Current (8/20μs) [L-PE, N-PE] In	50kA
Maximum Discharge Current (8/20μs) [L-PE, N-PE] Imax	1.5kV	1.5kV	1.5kV
Voltage Protection Level [L-PE, N-PE] Up	≤100ns
Response Time	630A gG Fuse
Backup Fuse	Normally Open and Normally Closed Contact Terminals
Remote Signal Alarm	AC: 250V/0.5A, 125V/1A; DC: 30V/0.1A
Remote Alarm Signal Energy Un/In	0.5mm² to 1.5mm²
Remote Alarm Signal Connection Wire	Floating Changeover Contact
Remote Contact Type	-40℃ to +80℃; 5%~95%
Temperature and Humidity Range	Red: Failed; Green: Normal
Disconnector Operation Indicator	4mm² Solid Wire / Flexible Wire
Minimum Installation Conductor Cross-Section Area (L, N, PE)	35mm² Standard Wire / 25mm² Flexible Wire
Maximum Installation Conductor Cross-Section Area (L, N, PE)	35mm Standard DIN Rail
Installation Method	Red Thermoplastic Material, UL94V-0
Enclosure Material	IP20
Enclosure Protection Degree	W×L×H: 144×91×66mm
Note: The above products can be optionally equipped with a remote signaling function. Products with remote signaling will have "/FM" added after the original model number, such as NPS01-FBC7/275/1/FM.