In industrial DC power systems, new energy power generation, communication base stations, and precision electrical equipment, surges and overvoltages caused by lightning induction, grid fluctuation, and circuit switching will directly lead to component breakdown, equipment damage, system downtime, and even fire hazards. Using a professional DC Surge Protector has become an essential safeguard to ensure stable operation and extend service life. This article explains the working principle and application value of DC surge protection, and focuses on the CJ-T2-DC Series DC Surge Protection Device launched by Zhejiang C&J Electrical co., ltd. (C&J Electrical).
A DC Protector installed at or within equipment such as DC servo mechanisms, fire alarm monitoring systems, security system controls, etc. provides compact, heavy-duty surge suppression. Senses when an overvoltage is occurring and switches from an “open” to a virtual “short” circuit.
A DC Surge Protector (also known as DC Surge Protection Device) is a protective device specially used in DC circuits to clamp overvoltage, discharge impulse current, and isolate surge interference. It can quickly act when abnormal overvoltage occurs, conduct a large amount of surge energy to the ground in an extremely short time, and automatically recover to the open-circuit state after the surge disappears. Compared with AC surge protectors, DC SPDs require more stable voltage clamping characteristics, faster response speed, and higher durability, and are widely used in photovoltaic, energy storage, industrial control, security, fire protection, communications, and new energy scenarios.
Overview of C&J Electrical CJ-T2-DC Series DC Surge Protector
The CJ-T2-DC Series is a pluggable Class II (Class C) DC Surge Protection Device developed by C&J Electrical, suitable for installation at LPZ 0B‑1 and higher lightning protection zones. It is mainly used to protect various DC power supply systems from surge damage, and is designed and manufactured in strict accordance with IEC 61643‑1 and GB 18802.1 standards.
This series adopts a modular pluggable structure, supports 800VDC, 1000VDC, 1200VDC, and 1500VDC (3P) voltage specifications, and has strong versatility. It can provide stable and reliable surge protection for photovoltaic combiner boxes, inverters, DC power distribution cabinets, industrial servo systems, fire monitoring, security equipment, communications DC screens, and charging piles. The product has the characteristics of high discharge capacity, fast response, safe and durable, easy installation and maintenance, and can adapt to long-term operation in harsh environments.
Core Features & Advantages of CJ-T2-DC Series DC Surge Protector
The CJ-T2-DC Series DC Surge Protector provides reliable protection performance and convenient operation and maintenance with the following structural characteristics:
• Pluggable module design, easy for installation, replacement and daily maintenance
• High discharge capacity and ultra-fast response speed, can discharge large surge current instantly
• Double thermal disconnection devices, effectively avoid overheating and burnout, and provide more reliable protection
• Multifunctional wiring terminals, suitable for both conductor connection and busbar connection, strong compatibility
• Visual fault indication: green window changes color when abnormality occurs; equipped with remote alarm terminal, which is convenient for background centralized monitoring
Application Range of CJ-T2-DC Series DC Surge Protector
The CJ-T2-DC Series DC Surge Protection Device is widely used in various DC power supply and electrical control scenarios due to its wide voltage range, strong environmental adaptability and high safety performance:
• Photovoltaic power generation system: DC combiner box, inverter, DC power distribution cabinet
• Industrial control equipment: DC servo mechanism, PLC system, drive power supply, instrumentation
• Security and fire protection system: fire alarm monitoring host, security control equipment, access control system
• Communication base station: DC power supply, DC screen, backup power system
• New energy facilities: energy storage systems, electric vehicle charging piles, mobile DC power supplies
• Rail transit, shipboard and battery-powered equipment: DC circuit surge protection
Technical Parameters of CJ-T2-DC Series DC Surge Protector
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Parameter
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Details
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|---|---|
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Type
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CJ-T2-DC/2P, CJ-T2-DC/3P
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Rated Voltage (Uc)
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800VDC / 1000VDC / 1200VDC / 1500VDC(3P)
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Nominal Discharge Current (In) 8/20μs
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20kA
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Maximum Discharge Current (Imax)
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40kA
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Voltage Protection Level (Up)
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3.2kV / 4.0kV / 4.4kV
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Response Time
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≤25ns
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Max. Backup Fuse
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125A gL/gG
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|
Operating Temperature
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-40°C … +80°C
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Wiring Cross-sectional Area
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1.5mm²~25mm² solid / 35mm² flexible
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Mounting
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35mm standard DIN rail
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Enclosure Material
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Purple (module)/light gray (base) thermoplastic, UL94‑V0
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Dimension
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1 mod
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Test Standards
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IEC 61643‑1; GB 18802.1; YD/T 1235.1
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Remote Signalling Contact
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Switching contact
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Weight
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206g / 283g
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Why Choose C&J Electrical CJ-T2-DC Series DC Surge Protector?
C&J Electrical focuses on the R&D and production of electrical protection components. The CJ-T2-DC Series DC Surge Protector provides stable and durable surge protection for various DC systems with strict standards, reliable performance, and user-friendly structure.
The product has a wide operating temperature range, high flame-retardant shell, dual thermal disconnection, remote alarm, and pluggable maintenance functions. It supports multiple voltage specifications and complete safety certifications, and can meet the application requirements of global industrial and new energy projects. At the same time, we support OEM brand customization, with sufficient supply and complete models, which can provide customers with targeted DC surge protection solutions.
Get in Touch
If you have any questions about the CJ-T2-DC Series DC Surge Protection Device, such as product model selection, technical parameters, customization needs, or bulk orders, please feel free to contact C&J Electrical. Our professional team will provide you with high-quality surge protection solutions and reliable services.
Post time: Mar-19-2026