GFU1-Ⅰ+Ⅱ AC Surge Protective Device

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Product Classification

Surge Protective Device

The GFU1-Ⅰ+Ⅱ AC Surge protective device is designed for AC power systems operating at 50/60Hz with rated voltages of 230V single-phase or 400V three-phase. It complies with IEC 61643-11 standards, meeting both Class I and II surge protection requirements. This device suppresses transient overvoltages below equipment surge withstand limits while dissipating surge energy to protect electrical circuits and equipment. Key features include: L-PE, N-PE, and L-N protection modes compatible with various grid systems; aging and overheat protection with degradation indicators; plug-in design; and optional remote alarm functionality. AC Surge Protection Device (SPD) - Reliable Power Protection Solution。
● Core applications：Lightning protection and surge protection for incoming line cabinets.
● Certification：IEC 61643-11.
● Kind of test：Type1+2/ClassⅠ+Ⅱ
● 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.

Ⓐ Key Features
● Advanced Protection Technology: Utilizes high-quality metal oxide varistors (MOVs) for fast response to voltage transients (<25ns response time)
● Wide Voltage Range: Available for various AC systems (120V, 230V, 400V, etc.)
● High Surge Capacity: Withstands surge currents up to 80kA (8/20μs waveform)
● Multi-Stage Protection: Incorporates coordinated multi-level protection for optimal equipment safety
● Thermal Protection: Built-in thermal disconnect mechanism for fail-safe operation
● Compact Design: Space-saving modular design for easy installation in distribution panels
Ⓑ Applications:
Main service entrance protection，Sub-panel protection，Critical equipment protection (servers, medical equipment, etc.)
Industrial control systems，HVAC and elevator systems。
Ⓒ Why Choose Our SPD?
Superior surge protection performance，Enhanced equipment lifespan，Reduced downtime and maintenance costs，Comprehensive warranty support，Global safety certifications，For detailed technical documentation or custom solutions, please contact our technical support team。

●Technical parameters

Core applications	Lightning protection and surge protection for incoming line cabinets
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	Type1+2/ClassⅠ+Ⅱ
Product model	GFU1-Ⅰ+Ⅱ-7					GFU1-Ⅰ+Ⅱ-12
Maximum continuous operating voltage (L-N) (Uc)	150V	275V	320V	385V	400V	150V	275V	320V	385V
Maximum continuous operating voltage (N-PE) (Uc)	255V					255V
Impulse current (10/350μs) (Iimp)	7kA					12.5kA
Nominal discharge current (8/20μs) (In)	20kA					30kA
Maximum discharge current (8/20μs) (Imax)	50kA					60kA
Voltage protection level（L-N）/(N-PE)(Up)	1.2/1.5kV	1.4/1.5kV	1.6/1.5kV	1.8/1.5kV	1.8/1.5kV	1.2/1.5kV	1.4/1.5kV	1.6/1.5kV	1.8/1.5kV
Maximum Reserve Fuse(gL/gG)	125A					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
7kA	150V	GFU1-Ⅰ+Ⅱ-7-1501S	GFU1-Ⅰ+Ⅱ-7-1502S	GFU1-Ⅰ+Ⅱ-7-1503S	GFU1-Ⅰ+Ⅱ-7-1504S	GFU1-Ⅰ+Ⅱ-7-1501NPES	GFU1-Ⅰ+Ⅱ-7-1503NPES
	275V	GFU1-Ⅰ+Ⅱ-7-2751S	GFU1-Ⅰ+Ⅱ-7-2752S	GFU1-Ⅰ+Ⅱ-7-2753S	GFU1-Ⅰ+Ⅱ-7-2754S	GFU1-Ⅰ+Ⅱ-7-2751NPES	GFU1-Ⅰ+Ⅱ-7-2753NPES
	320V	GFU1-Ⅰ+Ⅱ-7-3201S	GFU1-Ⅰ+Ⅱ-7-3202S	GFU1-Ⅰ+Ⅱ-7-3203S	GFU1-Ⅰ+Ⅱ-7-3204S	GFU1-Ⅰ+Ⅱ-7-3201NPES	GFU1-Ⅰ+Ⅱ-7-3203NPES
	385V	GFU1-Ⅰ+Ⅱ-7-3851S	GFU1-Ⅰ+Ⅱ-7-3852S	GFU1-Ⅰ+Ⅱ-7-3853S	GFU1-Ⅰ+Ⅱ-7-3854S	GFU1-Ⅰ+Ⅱ-7-3851NPES	GFU1-Ⅰ+Ⅱ-7-3853NPES
	400V	GFU1-Ⅰ+Ⅱ-7-4001S	GFU1-Ⅰ+Ⅱ-7-4002S	GFU1-Ⅰ+Ⅱ-7-4003S	GFU1-Ⅰ+Ⅱ-7-4004S	GFU1-Ⅰ+Ⅱ-7-4001NPES	GFU1-Ⅰ+Ⅱ-7-4003NPES
12.5kA	150V	GFU1-Ⅰ+Ⅱ-12.5-1501S	GFU1-Ⅰ+Ⅱ-12.5-1502S	GFU1-Ⅰ+Ⅱ-12.5-1503S	GFU1-Ⅰ+Ⅱ-12.5-1504S	GFU1-Ⅰ+Ⅱ-12.5-1501NPES	GFU1-Ⅰ+Ⅱ-12.5-1503NPES
	275V	GFU1-Ⅰ+Ⅱ-12.5-2751S	GFU1-Ⅰ+Ⅱ-12.5-2752S	GFU1-Ⅰ+Ⅱ-12.5-2753S	GFU1-Ⅰ+Ⅱ-12.5-2754S	GFU1-Ⅰ+Ⅱ-12.5-2751NPES	GFU1-Ⅰ+Ⅱ-12.5-2753NPES
	320V	GFU1-Ⅰ+Ⅱ-12.5-3201S	GFU1-Ⅰ+Ⅱ-12.5-3202S	GFU1-Ⅰ+Ⅱ-12.5-3203S	GFU1-Ⅰ+Ⅱ-12.5-3204S	GFU1-Ⅰ+Ⅱ-12.5-3201NPES	GFU1-Ⅰ+Ⅱ-12.5-3203NPES
	385V	GFU1-Ⅰ+Ⅱ-12.5-3851S	GFU1-Ⅰ+Ⅱ-12.5-3852S	GFU1-Ⅰ+Ⅱ-12.5-3853S	GFU1-Ⅰ+Ⅱ-12.5-3854S	GFU1-Ⅰ+Ⅱ-12.5-3851NPES	GFU1-Ⅰ+Ⅱ-12.5-3853NPES

●Circuit Diagram

●Appearance and Installation Dimensions

Keywords:

GFU1-Ⅰ+Ⅱ AC Surge Protective Device

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