GFU1-Ⅱ AC Surge Protective Device

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Product Classification

Surge Protective Device

The GFU1-Ⅱ AC Surge Protective Device (SPD) is a high-performance overvoltage protection solution designed to safeguard electrical and electronic equipment from transient surges, lightning strikes, and other power disturbances in AC power systems.
● Core applications：Lightning protection and surge protection for incoming line cabinets.
● Certification：IEC 61643-11.
● Kind of test：Type2/ClassⅡ
● Number of poles：1:1P，2:2P，3:3P，4:4P，1PN:1P+NPE，3PN:3P+NPE
● Dash current：7:7kA，12:12.5kA
● Maximum continuous operating voltage(N-PE)(Uc)：255V
● Working voltage：150:150V；275:275V；320:320V;385:385V;440:440V
● Operating Temperature Range： -35 ºC to+70 ºC
● Operating state/fault indication：Green/Red

E-mail:

gf@gf-ele.com

Product Description

●Introduction ●Model and Meaning

Our AC Surge Protection Device is designed to safeguard electrical equipment from transient voltage spikes and surges in AC power systems. This high-performance SPD provides robust protection for residential, commercial, and industrial applications.
GFU1-Ⅱ AC Surge Protective Device (SPD) Designed for AC 50/60Hz power distribution and control systems with single-phase rated voltages, this surge protector (SPD) meets Class II testing standards. It suppresses transient overvoltages below equipment surge withstand limits while dissipating surge energy, thereby protecting system circuits and equipment.
The surge protector features three protection modes: L-PE, N-PE, and L-N, compatible with various power grid systems. It provides aging and overheating protection, includes a degradation indicator, features an insert-type design, and offers optional remote alarm functionality.
Main functions: lightning protection and surge protection for incoming line cabinets

Ⓐ Key Features
● Advanced Protection Technology – Utilizes high-quality metal oxide varistors (MOVs) and multi-stage protection circuits to ensure reliable surge suppression.
● Wide Application Range – Suitable for low-voltage AC power systems in residential, commercial, and industrial settings.
● High Surge Current Capacity – Withstands impulse currents up to 40kA (8/20μs), providing robust defense against severe electrical surges.
● Visual Status Indication – Equipped with an LED indicator for real-time monitoring of operational status (green: normal; red: fault).
● Thermal Protection & Fail-Safe Mechanism – Built-in thermal disconnector automatically cuts off faulty SPDs to prevent overheating and fire hazards.
● Compact & Easy Installation – Modular design allows for DIN rail mounting, ensuring quick and hassle-free integration into distribution panels.
Ⓑ Compliance & Safety Standards
● Meets IEC 61643-11 standards for surge protective devices.
● Certified by authoritative testing institutions for safety and performance.
Ⓒ Applications
Power Distribution Systems – Protects switchboards, meters, and control panels.
Sensitive Electronics – Shields computers, servers, medical equipment, and communication devices.
Industrial & Infrastructure – Ensures stable operation of machinery, HVAC systems, and lighting networks.
Ⓓ Why Choose GFU1-Ⅱ SPD?
✅ Durability – Long service life with stable performance under frequent surges.
✅ Cost-Effective – Reduces downtime and equipment damage, lowering maintenance costs.
✅ Global Reliability – Trusted by engineers worldwide for critical surge protection.
For detailed specifications, installation guidelines, or customization options, please contact our technical team.
Protect Your Power System with GFU1-Ⅱ SPD – Where Safety Meets Innovation!

●Technical parameters

Number of poles	1P	2P	3P	4P	1P+NPE	3P+NPE
Applicable power system	TN-S、TN、TT	TN-S	TN-C	TN-S	TT、TN-S
Protected mode	L-PE、L-N	L-PE、N-PE	L-PE	L-PE、N-PE	L-N、N-PE
Kind of test	Type2/ClassⅡ
Product model	GFU1-Ⅱ-40
Maximum continuous operating voltage (L-N) (Uc)	150V	275V	320V	385V	400V
Maximum continuous operating voltage (N-PE) (Uc)	255V
Nominal discharge current (8/20μs) (In)	20kA
Maximum discharge current (8/20μs) (Imax)	40kA
Voltage protection level（L-N）/(N-PE)(Up)	1.2/1.5kV	1.5/1.5kV	1.6/1.5kV	1.8/1.5kV	1.8/1.5kV
Maximum Reserve Fuse(gL/gG)	125A
Response time（L-N）/(N-PE)(tA)	≤25ns/≤100ns
Operating Temperature Range	-35 ºC -+70 ºC
Work Status / Fault Indication	Green/red
Remote signaling terminal wiring capability	Maximum 4-35mm²
Tightening torque	2-3.5N·m
levels of protection	IP20
Terminal wiring capability	Hard wire2.5-35mm² ，soft wire2.5-25mm²
Installation	Mounting on 35mm DIN rail

●Product Types Choosing

Impulse Current (10/350μs) (Iimp)	working voltage (L-N) (Uc)	Number of poles
Impulse Current (10/350μs) (Iimp)	working voltage (L-N) (Uc)	1P	2P	3P	4P	1P+NPE	3P+NPE
40kA	150V	GFU1-Ⅱ-40-1501S	GFU1-Ⅱ-40-1502S	GFU1-Ⅱ-40-1503S	GFU1-Ⅱ-40-1504S	GFU1-Ⅱ-40-1501NPES	GFU1-Ⅱ-40-1503NPES
	275V	GFU1-Ⅱ-40-2751S	GFU1-Ⅱ-40-2752S	GFU1-Ⅱ-40-2753S	GFU1-Ⅱ-40-2754S	GFU1-Ⅱ-40-2751NPES	GFU1-Ⅱ-40-2753NPES
	320V	GFU1-Ⅱ-40-3201S	GFU1-Ⅱ-40-3202S	GFU1-Ⅱ-40-3203S	GFU1-Ⅱ-40-3204S	GFU1-Ⅱ-40-3201NPES	GFU1-Ⅱ-40-3203NPES
	385V	GFU1-Ⅱ-40-3851S	GFU1-Ⅱ-40-3852S	GFU1-Ⅱ-40-3853S	GFU1-Ⅱ-40-3854S	GFU1-Ⅱ-40-3851NPES	GFU1-Ⅱ-40-3853NPES
	400V	GFU1-Ⅱ-40-4001S	GFU1-Ⅱ-40-4002S	GFU1-Ⅱ-40-4003S	GFU1-Ⅱ-40-4004S	GFU1-Ⅱ-40-4001NPES	GFU1-Ⅱ-40-4003NPES

●Circuit Diagram

●Appearance and Installation Dimensions

Keywords:

GFU1-Ⅱ AC Surge Protective Device

安安新材料