GFU1Z-Ⅱ DC Surge Protective Device

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Product Classification

Surge Protective Device

The GFU1Z-Ⅱ DC Surge Protective Device (SPD) is a high-performance protection solution designed for direct current (DC) power systems. It provides reliable overvoltage and surge protection against transient voltage spikes caused by lightning strikes, switching operations, or other electrical disturbances.
● Certification：IEC 61643-31.
● Kind of test：Type2/ClassⅡ
● Number of poles：2:2P，3:3P
● Maximum continuous operating voltage (Uc)：2P（1000VDC）,3P（1500VDC）
● Nominal discharge current (8/20μs) (In)：20kA
● Maximum discharge current (8/20μs) (Imax)：40kA
● 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

The GFU1Z-Ⅱ DC Surge Protective Device (SPD) is a high-performance protection solution designed for direct current (DC) power systems, effectively safeguarding sensitive electrical equipment against transient overvoltages caused by lightning strikes, switching surges, and other electromagnetic interference.
This device is widely used in solar photovoltaic (PV) systems, DC power distribution networks, electric vehicle charging stations, telecom base stations, and industrial DC applications.

Ⓐ Key Features
● High Surge Current Capacity
Maximum Discharge Current (Imax): Up to 40kA (8/20μs)
Nominal Discharge Current (In): 20kA (8/20μs)
Effectively suppresses high-energy transients to safeguard sensitive DC equipment.
● Low Residual Voltage & Fast Response
Residual Voltage (Up): ≤3.8kV (depends on model)
Response Time: <25ns
Minimizes voltage let-through, ensuring optimal protection for downstream devices.
● Wide Operating Voltage Range
Rated Voltage (Uc): DC 1000V/1500V (customizable options available)
Suitable for various DC power systems (e.g., PV arrays, battery banks).
4. Advanced Protection & Status Indication
Thermal Disconnect Technology – Automatically disconnects in case of overload to prevent fire hazards.
Visual Status Indicator – Shows operational status (Green = Normal, Red = Fault).
● Robust & Durable Design
Housing Material: Flame-retardant UL94-V0 plastic or metal casing (optional).
Protection Class: IP20 (standard) for indoor use (higher IP ratings available upon request).
Mounting: DIN-rail compatible for easy installation.
● Compliance & Certifications
Meets IEC 61643-31, EN 61643-31,standards for surge protective devices.
CE, RoHS compliant for environmental safety.
Ⓑ Typical Applications
● Solar PV Systems – Protects inverters, charge controllers, and DC combiner boxes.
● Electric Vehicle (EV) Charging Stations – Ensures stable DC power supply.
● Telecom & Data Centers – Guards DC backup power systems.
● Industrial DC Power Distribution – Secures PLCs, sensors, and automation equipment.
Ⓒ Installation & Wiring
● Install in parallel with the DC power line (L+/L-).
● Follow local electrical codes and maintain proper grounding.
● Replace after severe surge events (indicated by fault status).
● Custom configurations available upon request.
Ⓓ Conclusion
The GFU1Z-Ⅱ DC Surge Protective Device is an essential safeguard for DC power systems, ensuring long-term reliability and minimizing downtime due to electrical surges. With its high surge capacity, fast response, and robust design, it is an ideal choice for renewable energy, industrial, and telecom applications.
For technical specifications, datasheets, or customized solutions, please contact our sales team.

●Technical parameters

Product model	GFU1Z-Ⅱ
Kind of test	Type2/ClassⅡ
Protected mode	（DC+）-PE，(DC-)-PE，(DC+)-(DC-)
Number of poles	2P	3P
Maximum continuous operating voltage (Uc)	1000VDC	1500VDC
Nominal discharge current (8/20μs) (In)	20kA
Maximum discharge current (8/20μs) (Imax)	50kA
Voltage protection level (Up)	3.8kV	5.0kV
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
Installation	Mounting on 35mm DIN rail

●Product Types Choosing

Number of poles	Maximum continuous operating voltage (Uc)	Maximum discharge current (8/20μs) (Imax)
Number of poles	Maximum continuous operating voltage (Uc)	40kA
2P	1000VDC	GFU1Z-Ⅱ40-10002S
3P	1500VDC	GFU1Z-Ⅱ40-15003S

●Circuit Diagram ●Appearance and Installation Dimensions

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GFU1Z-Ⅱ DC Surge Protective Device

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