In modern electrical systems, transient overvoltages (electrical surges) caused by lightning strikes, grid switching, or equipment malfunctions pose a serious threat to electrical installations and precision devices. SPD (Surge Protective Device) surge protection has become a crucial safety barrier to mitigate such risks. It can quickly clamp and discharge surge currents, preventing transient overvoltages from damaging electrical systems. Zhejiang C&J Electrical co., ltd. (referred to as C&J Electrical) specializes in high-performance surge protection equipment, and its CJ-T1T2-DC SPD stands out with excellent discharge capacity, reliable protection, and flexible installation, providing all-round surge protection for DC power supply systems.
Core Overview of SPD Surge Protection
Surge Protective Devices (SPD) are used to protect the electrical installation, which consists of the consumer unit, wiring and accessories, from electrical power surges known as transient overvoltages. SPD surge protection is a passive protection technology that relies on the nonlinear characteristics of internal components (such as varistors, gas discharge tubes) to respond to transient overvoltages in milliseconds or even nanoseconds.
Different from traditional circuit protection devices, SPD does not cut off the circuit under normal working conditions but stays in a high-impedance state, not affecting the normal operation of the power supply system. When a transient overvoltage occurs, SPD quickly switches to a low-impedance state, diverting the surge current to the ground, thereby clamping the overvoltage to a safe level and protecting the downstream electrical equipment. According to the protection level and application scenario, SPD is divided into different classes (such as Class I, II, III), which are used in coordination to form a multi-level surge protection system.
Core Functions of SPD Surge Protection
C&J Electrical’s CJ-T1T2-DC SPD integrates multiple core protection functions, realizing efficient and reliable surge protection for DC power supply systems. Its main functions include:
- Transient overvoltage clamping: Quickly clamps the transient overvoltage caused by lightning strikes or grid surges to a safe level, preventing damage to electrical equipment insulation and electronic components.
- Surge current discharge: With high discharge capacity, it can quickly divert large surge currents (up to 50kA) to the ground, reducing the impact of surges on the power supply system.
- Double thermal disconnection protection: Equipped with double thermal disconnection devices, which can cut off the circuit in time when the SPD is overheated due to long-term operation or faults, avoiding fire hazards and ensuring the safety of the system.
- Fault indication and alarm: The green window changes color when a fault occurs, providing intuitive fault indication; it is also equipped with a remote alarm terminal, enabling real-time monitoring of theSPD working status and timely troubleshooting.
- Follow current extinguishing: Has excellent follow current extinguishing capability, ensuring that the 32A fuse will not be triggered under the condition of 2kAms 255V, maintaining the stability of the power supply system.
Application Scenarios of SPD Surge Protection
With the characteristics of quick response, high discharge capacity, and wide adaptability, SPD surge protection is widely used in various DC power supply systems and scenarios vulnerable to surge impacts. The main application fields are as follows:
- New energy systems: Solar photovoltaic (PV) power generation systems, wind power generation systems, etc. Protect the DC side of PV modules, inverters, and energy storage equipment from lightning surges and grid transient overvoltages.
- Industrial control systems: DC power supply systems of industrial automation equipment, PLC controllers, sensors, and other precision instruments. Prevent surges from interfering with the normal operation of control systems and causing equipment misoperation or damage.
- Communication systems: Data centers, communication base stations, and network equipment rooms. Protect communication power supplies, servers, switches, and other equipment from surges, ensuring the continuous and stable operation of communication networks.
- Transportation systems: DC power supply systems of electric vehicles, rail transit, and charging piles. Protect charging equipment, on-board electrical systems, and power distribution lines from surge damage.
- Building electrical systems: DC power supply systems of intelligent buildings, such as access control systems, monitoring systems, and emergency lighting systems. Protect building electrical installations and intelligent equipment from transient overvoltages.
- Special environments: Outdoor electrical equipment, high-altitude facilities, and harsh industrial environments. Adapt to extreme temperature and humidity conditions, providing reliable surge protection in complex environments.
C&J Electrical’s CJ-T1T2-DC SPD: Core Advantages & Specifications
C&J Electrical’s CJ-T1T2-DC SPD is a pluggable Class I+II (Class B+C) surge protector designed for DC power supply systems. It is installed at LPZ0A-1 or higher, complying with IEC 61643-1/GB 18802.1 standards, and provides reliable surge protection for various DC power supply systems. Its core advantages, structural features, and technical parameters are as follows:
Structural Features & Core Advantages
- Pluggable modular design: Adopts a pluggable module, which is easy to install, disassemble, and maintain, reducing downtime and maintenance costs.
- Excellent surge protection performance: High discharge capacity (maximum discharge current 50kA) and quick response time (≤100ns), effectively suppressing transient overvoltages and surge currents.
- Dual safety protection: Equipped with double thermal disconnection devices, providing more reliable overheating protection and avoiding fire hazards caused by SPD faults.
- Flexible connection: Multifunctional terminals for connection of conductors and busbars, compatible with 35mm² solid/50mm² flexible wires, adapting to different wiring requirements.
- Intuitive monitoring and alarm: Fault indication window and remote alarm terminal enable real-time monitoring of working status, facilitating timely fault handling.
- Wide environmental adaptability: Operating temperature range of -40°C to +80°C (parallel wiring) and -40°C to +60°C (through wiring), adapting to extreme temperature environments; enclosure material is UL94-V0 thermoplastic, with excellent flame retardancy.
- Customizable services: Supports OEM brand customization, with multiple specifications available, meeting the personalized needs of different customers and market segments.
Main Technical Parameters
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Parameter
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Details
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|---|---|
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Product Model
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CJ-T1T2-DC/3P
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|
Rated Voltage (UC)
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800VDC / 1000VDC / 1200VDC / 1500VDC
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|
Lightning Impulse Current (10/350) [lImp]
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7kA
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Nominal Discharge Current (8/20) [ln]
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20kA
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Maximum Discharge Current [Imax]
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50kA
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Voltage Protection Level [Up]
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4.2kV / 4.5kV / 5.0kV
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|
Follow Current Extinguishing Capability [If]
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32A fuse will not be triggered at 2kAms 255V
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Response Time [tA]
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≤100ns
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Max. Backup Fuse
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200AgL/gG (L); 125AgL/gG (L-L’)
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|
TOV Voltage
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355V/5sec
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|
Operating Temperature Range
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Parallel wiring: -40°C…+80°C; Through wiring: -40°C…+60°C
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|
Cross-sectional Area
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35mm² solid / 50mm² flexible
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|
Mounting
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35mm 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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2 mods
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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; A.C.:250V/0.5A; D.C.:250V/0.1A,125V/0.2A,75V/0.5A
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|
Packing Unit & Weight
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1pc(s); 288g
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Why Choose C&J Electrical’s CJ-T1T2-DC SPD?
In the field of SPD surge protection, the CJ-T1T2-DC SPD from C&J Electrical has obvious competitive advantages, becoming the preferred choice for customers pursuing reliable surge protection and stable performance:
- Reliable protection performance: Complies with international and national standards, with high discharge capacity, quick response time, and double thermal disconnection protection, ensuring all-round surge protection.
- Humanized design: Pluggable module for easy maintenance, intuitive fault indication, and remote alarm function, improving operation and maintenance efficiency.
- Wide adaptability: Multiple rated voltage specifications, wide temperature range, and flexible wiring, adapting to various DC power supply systems and harsh environments.
- High safety: UL94-V0 flame-retardant enclosure, double thermal disconnection devices, and excellent follow current extinguishing capability, ensuring safe operation in various scenarios.
- Customizable flexibility: Supports OEM brand customization and multiple specifications, adapting to the personalized needs of different customers and markets.
- Professional support: C&J Electrical has a professional technical team that can provide customers with tailored SPD surge protection solutions and comprehensive after-sales services, solving customers’ worries.
Get in Touch
If you have any questions about the CJ-T1T2-DC SPD, such as product specifications, technical details, 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 to ensure the safe and stable operation of your DC power supply system.
Post time: Jan-28-2026