Three-Pole Integrated Design for Three-Phase Three-Wire System Protection

Product Overview

The NPS01-FBC7 AC 3P Surge Protective Device is a Type 1+2 combined surge protection solution designed for three-phase three-wire power distribution systems. It is manufactured according to EN/IEC 61643-11 and GB/T 18802.11 international standards and has passed Type 1+2 / Class I+II testing requirements.

The product adopts a three-pole modular structure with independent L1/L2/L3 discharge paths, providing effective protection against lightning overvoltage and switching surges between phases and ground. It is especially suitable for IT ungrounded systems, photovoltaic inverter sides, industrial variable-frequency drives, and other three-phase power applications.

With a 54mm modular width and standard 35mm DIN rail installation, the device supports Uc voltage options from 275V to 440V and is widely used in renewable energy systems, chemical industries, industrial automation, and rail transportation applications.

Multi-Pulse Lightning Withstand Design for Stable Repeated Protection

The internal protection structure combines high-quality graphite spark gaps with zinc oxide varistors, providing strong energy discharge capability and stable performance under repeated lightning impacts.

Each pole is equipped with an independent thermal disconnector, ensuring that a single module failure does not affect the operation of other phases. The main components undergo high-temperature and high-humidity aging tests to improve resistance against environmental stress.

High-purity copper conductors and tin-plated terminals are used to reduce contact resistance and temperature rise during high-current discharge. The enclosure adopts UL94V-0 flame-retardant thermoplastic material with IP20 protection, ensuring reliable insulation and safe operation.

Automated manufacturing processes and 100% factory impulse current testing ensure consistent product quality and dependable protection performance.

Industrial Wide Temperature Operation from -40℃ to +80℃

The device supports 7kA (10/350μs) impulse current capacity, 20kA (8/20μs) nominal discharge current, and 50kA maximum discharge current. With a low voltage protection level of 1.2kV and response time ≤25ns, it provides fast surge suppression and low residual voltage.

The built-in thermal disconnector and red/green status indicator allow quick identification of operating conditions. Green indicates normal operation, while red indicates module replacement is required.

The unit is recommended for use with a 100A gG backup fuse and supports optional remote signaling contacts for connection with SCADA or monitoring systems. It operates reliably from -40℃ to +80℃ with 5%-95% humidity and supports 4-25mm² cable connections, making it suitable for industrial three-phase power systems.

Model	NPS01-FBC7/275/3	NPS01-FBC7/320/3	NPS01-FBC7/385/3	NPS01-FBC7/440/3
SPD Test Category	Type1+2/ClassI+II(EN/IEC61643-11,GB/T18802.11)
Maximum Continuous Operating Voltage Uc (Current Type: a.c.)	275V(NPE255V)	320V	385V(NPE255V)	440V
Lightning Impulse Current (10/350μs) [L-PE, N-PE] Iimp	7kA	7kA	7kA	6.25kA
Nominal Discharge Current (8/20μs) [L-PE, N-PE] In	20kA
Maximum Discharge Current (8/20μs) [L-PE, N-PE] Imax	50kA
Voltage Protection Level [L-PE, N-PE] Up	1.2kV	1.3kV	1.5kV	1.7kV
Response Time	≤25ns (N-PE: 100ns)
Backup Fuse	100A gG Fuse
Remote Signal Alarm	Normally Open and Normally Closed Contact Terminals
Remote Alarm Signal Energy Un/In	AC: 250V/0.5A; 125V/1A; DC: 30V/0.1A
Remote Alarm Signal Connection Wire	0.5mm² to 1.5mm²
Remote Contact Type	Floating Changeover Contact
Temperature and Humidity Range	-40℃ to +80℃, 5%~95%
Disconnector Operation Indicator	Red: Failed; Green: Normal
Minimum Installation Conductor Cross-Section Area (L, N, PE)	4mm² Solid Wire / Flexible Wire
Maximum Installation Conductor Cross-Section Area (L, N, PE)	25mm² Standard Wire / Flexible Wire
Installation Method	35mm Standard DIN Rail
Enclosure Material	Red Thermoplastic Material, UL94V-0
Enclosure Protection Degree	IP20
Dimensions	W×L×H: 54×87×87mm
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.