1+1P Full Protection Structure Designed for TT/IT Power Systems

Product Overview

The NPS01-FBC7 AC 1+1P Surge Protective Device is a Type 1+2 combined surge protection unit specially designed for single-phase TT and IT grounding systems. It complies with EN/IEC 61643-11 and GB/T 18802.11 standards and meets Type 1+2 / Class I+II protection requirements.

Featuring a phase line and neutral line protection structure, the device provides independent L-PE and N-PE discharge paths. It is particularly suitable for systems with isolated neutral points or high-impedance grounding applications, including industrial facilities, chemical plants, and rail transportation power networks.
The compact 36mm housing adopts standard 35mm DIN rail mounting, with Uc voltage options from 275V to 440V.

Graphite Spark Gap + MOV Cascaded Structure for Stable Protection

The internal protection circuit combines graphite spark gaps with zinc oxide varistors, creating a coordinated multi-stage protection system. The spark gap effectively handles high-energy lightning surges, while the varistor provides precise voltage clamping for secondary protection.

This design prevents follow current after surge discharge and minimizes leakage current during normal operation. The conductive path uses high-purity copper busbars and tin-plated terminals, ensuring low contact resistance and excellent current carrying capability.

The enclosure adopts UL94V-0 flame-retardant thermoplastic material with IP20 protection. Automated assembly processes and complete aging tests ensure consistent quality and long service life.

7kA Lightning Protection Capacity with Thermal Disconnection and Remote Monitoring

The device supports an impulse current capacity of 7kA (10/350μs), nominal discharge current (In) of 20kA (8/20μs), and maximum discharge current (Imax) of 50kA. The voltage protection level can reach 1.2kV, with a response speed of ≤25ns (100ns in NPE mode).

The integrated thermal disconnector automatically isolates the module when overheating or failure occurs. The visual indicator changes from green to red to clearly show the operating status.

Optional remote alarm contacts support AC 250V/0.5A switching capacity for connection to monitoring systems. The product operates between -40℃ and +80℃ and supports 4-25mm² cable connections, making it suitable for high-reliability single-phase industrial power protection.

Model	NPS01-FBC7/275/1+1	NPS01-FBC7/320/1+1	NPS01-FBC7/385/1+1	NPS01-FBC7/440/1+1
SPD Test Category	Type1+2/ClassI+II(EN/IEC61643-11, GB/T18802.11)
Maximum Continuous Operating Voltage Uc (Current Type: a.c.)	275V(NPE255V)75V	320V(NPE255V)	385V(NPE255V)	440V(NPE255V)
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: 36×87×87mm
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.