50kA Ultra-High Current Two-Pole Protection, Ultimate Surge Protection for Critical Single-Phase Systems

Product Overview

The NPS01-FA50 AC 2P Surge Protective Device is a Type 1/Class I pure spark-gap surge protection device designed for critical single-phase power distribution systems. It complies with IEC 61643-11 and GB/T 18802.11 standards and has passed Class I impulse current testing.

Featuring a two-pole integrated design with independent L-PE and N-PE high-capacity graphite spark gaps, the device provides an impulse current capability of up to 50kA (10/350μs waveform), effectively discharging high-energy direct lightning currents. It is ideal for the incoming power protection of critical single-phase systems in data centers, medical facilities, communication hubs, and other important applications.

Independent High-Capacity Graphite Gap, Zero Leakage Current and Long Service Life

The device adopts large-capacity high-purity graphite spark-gap technology, providing excellent follow-current interruption capability and high energy withstand performance. After lightning discharge, it quickly cuts off power-frequency follow current, while maintaining zero leakage current and zero power consumption during normal operation.

The independent two-pole structure prevents a single-pole failure from affecting the entire device. High-purity copper conductive components ensure low resistance, strong current carrying capacity, and low temperature rise under high current conditions.

The housing is made of UL94V-0 flame-retardant material with IP20 protection, ensuring reliable operation in industrial environments.

Compatible with 630A Backup Fuse for High-Current Single-Phase Systems

With a nominal discharge current In of 50kA (8/20μs), voltage protection level Up ≤1.5kV, and response time ≤100ns, the device is suitable for building high-reliability multi-stage lightning protection systems.

Recommended with a 630A gG backup fuse for optimized protection coordination and preventing unnecessary upstream breaker tripping during lightning events.

Equipped with thermal disconnection protection and red/green status indicators, the device provides clear operating status monitoring. Optional remote alarm contacts support centralized monitoring systems.

Operating temperature range: -40℃ to +80℃
Compatible cable size: 4-35mm²

Model	NPS01-FA50/275/2	NPS01-FA50/320/2	NPS01-FA50/385/2
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: 72×91×66mm
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.