50kA Ultra-High Current Three-Pole Protection, Industrial Heavy-Duty Lightning Protection Solution

Product Overview

The NPS01-FA50 AC 3P Surge Protective Device is a high-energy Type 1/Class I surge protection device designed for heavy-duty three-phase three-wire power systems.

Compliant with IEC 61643-11 and GB/T 18802.11 standards, it adopts a three-pole independent modular structure. Each pole provides an impulse current capability of 50kA (10/350μs), allowing rapid discharge of extreme direct lightning energy.

The device is widely used in large factories, photovoltaic systems, power distribution stations, metallurgy, chemical industries, and rail transit systems, providing first-level lightning protection for high-power applications.

Independent Large Graphite Spark Gaps, Reliable Protection Against Repeated Lightning Strikes

Equipped with upgraded high-purity graphite spark-gap technology, each phase operates independently to ensure stable protection performance.

The advanced arc extinguishing design quickly interrupts follow current after discharge, achieving zero leakage current and zero power loss during normal operation.

High-strength copper conductive components provide excellent current carrying capacity and low temperature rise under heavy loads, making the device suitable for continuous industrial operation.

The flame-retardant housing complies with UL94V-0, providing safe operation in demanding environments.

630A Backup Fuse Matching, Designed for Large Industrial Power Systems

The device features:

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

Compatible with 630A gG backup fuses to achieve coordinated protection with upstream equipment and prevent accidental power interruption.

Each phase includes independent thermal protection and visual status indication. Optional remote alarm contacts allow connection to PLC, SCADA, or monitoring systems.

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

Model	NPS01-FA50/275/3	NPS01-FA50/320/3	NPS01-FA50/385/3
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: 108×91×66mm
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.