Type 2 DC Surge protective device

Premium SPD Manufacturer

LETOP Type 2 DC surge protective device reduces residual surge voltage, protecting equipment in medium-risk environments like data centers and commercial buildings. The nominal discharge current 8/20µs (In) is 20kA. Ideal for medium-risk environments such as commercial buildings, data centers, and manufacturing plants.

Type 2 DC Surge Protective Device Manufacturer

As an experienced Type 2 DC SPD manufacturer, we offer comprehensive solutions that deliver key concerns of OEM brands, system integrators, and installers. Our advantages include: 10+ years of manufacturing expertise, TUV certified in-house R&D, flexible MOQ starting from 100 pieces, 2 year product warranty, and dedicated technical support team. Our quality management system ensures consistent product performance and on-time delivery for your projects.

Type 2 DC Surge Protective Device Series

Standard surge protection for most residential, commercial, and utility-scale combiner boxes against indirect lightning strikes and switching surges.

Technical Specifications of Our Type 2 DC Surge Arrester

LETOP Type 2 DC surge protective device operates across DC voltage ranges from 600V to 1500V, with optimized maximum continuous operating voltage (UC) ratings for modern photovoltaic system architectures. The nominal discharge current (In) of 20kA and maximum discharge current (Imax) of 40kA provide robust protection capability against the most severe surge events encountered in solar installations.
 
The protection level (Up) is carefully engineered at <5.2kV @1500Vdc to ensure sensitive electronic components remain within safe operating parameters during surge events. Temperature coefficient optimization allows our DC SPD Type 2 to maintain stable protection characteristics across operating temperatures from -40°C to +85°C.
 
The robust polycarbonate housing with IP20 rating provides reliable protection in standard electrical enclosures, while optional IP65 enclosures are available for harsh environmental applications requiring enhanced Type 2 DC surge protection.
LETOP Type2 DC SPD Datasheet
Installation Guide for LETOP DC Surge Protective Device
DC Surge Protective Device Wiring
Maintenance Guide for DC Surge Protective Device
Certificates of DC Surge Protective Device

We are one of the few manufacturers in the SPD industry that is vertically integrated from MOV chips to finished SPDs. We independently develop formulas, produce chips, design products, and manufacture and assemble. We master core technologies and supply chains to ensure stable product quality, controllable delivery cycles, and strong cost competitiveness. This enables LETOP to respond quickly to market needs and provide highly customized solutions.

Our advanced manufacturing plant covers an area of ​​15,000 square meters and has 4 dedicated production lines configured for Type 2 DC surge protector assembly. With automated assembly systems and automated precision welding equipment, we always maintain consistent quality standards and produce 1.5 million Type 2 DC surge protectors per month, ensuring reliable supply chain support for bulk orders.

We invests in automated testing equipment (including dedicated 8/20μs pulse generators and aging test chambers), allowing us to verify each Type 2 DC surge protector according to strict performance standards.

LETOP Type 2 DC surge protective devices are specifically designed for installation at critical protection points throughout photovoltaic systems. At inverter DC inputs, our Class II DC SPDs safeguard expensive power electronics from induced overvoltages caused by nearby lightning strikes or grid switching operations, preventing costly equipment failures and production downtime.
 
In combiner box applications, Type 2 DC surge arresters provide essential protection for string monitoring equipment, DC contactors, and fusing systems. Our manufacturing experience with over 500 major solar projects worldwide has shown that proper Type 2 DC SPD placement can reduce inverter failure rates by up to 85%, significantly improving system reliability and return on investment for project developers.
 
System designers and EPC contractors particularly appreciate our DC SPD Type 2 solutions for their compact DIN-rail mounting design, which makes integration into existing electrical enclosures easy without requiring panel modifications. The standardized connection interface simplifies installation procedures and reduces labor costs for electrical contractors working on utility-scale and commercial solar installations.
Ready to Get the Custom Type 2 DC Surge Protective Device Solution? Contact Us to Get A Free Consultation!

FAQ

Here you can find answers to some of your common questions related to the DC SPD.

What is the difference between Type 2 DC SPD and Type 1+2 DC SPD?

Type 2 DC SPDs are specifically designed to protect against induced lightning strikes and switching overvoltages (8/20μs waveform), and are primarily installed inside equipment or at secondary protection locations. Compared to Type 1+2 combined devices, Type 2 devices have a faster response time (<25ns) and lower protection voltage levels, but a relatively smaller discharge capacity. Situations where choosing a Type 2 DC SPD is appropriate include:

  • The PV system already has primary lightning protection;
  • The system is located in a low lightning risk area; - Primarily used for DC input protection of inverters or string monitoring equipment;
  • Small to medium-sized PV projects that prioritize cost-effectiveness;
  • Limited internal space in equipment requiring a compact protection solution.

 

As a professional manufacturer, our Type 2 DC SPDs are optimally designed to achieve the best balance between protection performance and cost, making them particularly suitable for price-sensitive applications that still require reliable protection. We can assist you in choosing the most suitable protection solution based on your specific risk assessment results and budget considerations.

How reliable are your company's Type 2 DC SPDs in extreme environments?

Our Type 2 DC SPDs are specifically strengthened for harsh outdoor PV application environments:

  • Wide temperature range: operating temperature -40°C to +85°C, storage temperature up to -50°C to +95°C;
  • UV resistance: housing material contains UV stabilizers, tested for 2000 hours of UV aging;
  • Humidity adaptability: stable operation within 5%-95% relative humidity, moisture-proof design complies with IEC IP20/IP65 standards;
  • Salt spray corrosion: passed 480 hours of neutral salt spray testing, suitable for coastal and industrial pollution environments;
  • Vibration and shock: passed IEC 60068-2-6 vibration and shock tests, adapting to transportation and installation stress.

 

We have successful application cases in various extreme environments worldwide, including desert regions in the Middle East (+70°C high temperature), Northern Europe (-40°C low temperature), coastal areas (high salt spray), and high-altitude regions. The products have undergone 100,000 hours of actual operation verification, with a Mean Time Between Failures (MTBF) exceeding 25 years. We also offer environmental adaptability customization services to optimize product design for special application environments.

What key parameters need to be considered for Type 2 DC SPD selection and configuration?

Choosing the appropriate Type 2 DC SPD requires comprehensive consideration of the following key parameters:

  • Maximum continuous operating voltage (Uc): Should be selected to be ≥1.2 times the system's maximum operating voltage;
  • Nominal discharge current (In): According to IEC 61643-31 standard, it is recommended to choose a specification ≥20kA;
  • Voltage protection level (Up): Should be lower than the impulse withstand voltage of the protected equipment;
  • Maximum discharge current (Imax): Considering the possible maximum lightning current, it is recommended to be ≥40kA;
  • Response time: It's recommended to be <25ns for PV applications;
  • Connection method: Choose bolt-type, pluggable, or DIN rail mounting based on installation space.

 

We provide free system protection solution design services, including SPD quantity configuration, installation location recommendations, and protection coordination analysis. For complex projects, our technical team will recommend precise products based on your system parameters (voltage level, power, installation location, environmental conditions).

What are the core technical advantages of your company's Type 2 DC SPD?

Our Type 2 DC SPD stands out in the market with several core technical advantages:

  • Advanced MOV formulation technology: Uses a patented zinc oxide varistor formula, providing lower protection voltage and higher energy density;
  • Intelligent thermal protection: Unique temperature monitoring and thermal disconnect mechanism, automatically disconnecting in case of abnormal overheating to prevent fire hazards;
  • Low leakage current design: Standby leakage current <50μA, minimizing impact on system efficiency; - Fast response technology: Response time optimized to <25ns, ensuring effective protection against fast transients;
  • Modular structure: Pluggable design facilitates maintenance, allowing replacement without disconnecting the system; - Integrated monitoring function: Optional RS485 communication interface, supporting remote status monitoring;
  • Enhanced reliability: Passed 5000 impulse aging tests, with a field failure rate of <0.2%.

 

Compared to similar products, our Type 2 DC SPD offers significant advantages in protection performance, service life, and maintenance convenience. These technological innovations provide customers with higher protection value and lower total lifecycle cost.

How to verify the protection effectiveness of Type 2 DC SPD?

Verifying the protection effectiveness of Type 2 DC SPD requires multiple levels of assessment:

  1. Factory testing: We conduct 100% functional testing on every device, including protection voltage testing, leakage current testing, and insulation resistance testing;
  2. Type testing: Products pass type tests by TÜV authorized institutions, verifying compliance with international standards such as IEC 61643-31;
  3. System-level verification: By injecting standard lightning waveforms, the coordination of the entire protection system is verified;
  4. Long-term monitoring: Optional remote monitoring system real-time monitors SPD status, recording operation counts and performance parameters.

 

For important projects, we can also provide third-party witnessed testing services. We have established a TÜV-certified internal laboratory and accumulated sufficient actual lightning impulse test data to provide reliable data support for product performance. All test reports and certification documents can be provided to customers to ensure compliance with project acceptance and insurance assessment requirements.

What are the expected failure modes of Type 2 DC SPD?

 Our Type 2 DC SPD is designed for "safe failure" mode, and the main failure modes include:

  • Normal aging: MOV performance gradually degrades after multiple lightning impulses, which can be detected in advance through the status indicator;
  • Overload protection: When subjected to an impulse exceeding its design capacity, the thermal disconnector operates, safely disconnecting the device to prevent fire;
  • Short-circuit fault: In extreme cases, an internal short circuit may occur, and the upstream protection device will cut off the power to protect system safety.
  • Fault indication: Our products have clear fault indication functions, green indicates normal, red indicates replacement is needed.
What is your company's supply capability for Type 2 DC SPD?

We have strong supply capabilities to meet project demands of various scales:

  • Production scale: Own 4 dedicated automated production lines, with a monthly capacity of 100,000 Type 2 DC SPDs;
  • Production cycle: Standard product delivery time is 2-3 weeks, customized order delivery time is 3-4 weeks, and special production plans can be arranged for large-volume orders;
  • Raw material reserves: Self-built MOV factory, strategic cooperation with core suppliers, maintaining a 30-day safety stock of key components;
  • Quality assurance: Even in large-volume production, we insist on 100% testing to ensure consistent quality for every product.
How does the application of Type 2 DC SPD differ in different types of PV systems?

The application of Type 2 DC SPD in different PV systems requires differentiated configurations:

  • Residential systems (3-10kW): Typically install 1-2 units at the inverter DC input, focusing on inverter protection;
  • Commercial systems (50-500kW): Require graded protection at the combiner box output and inverter input;
  • Centralized power plants (>1MW): Adopt a layered protection strategy, covering from string combiner boxes to inverter stations;
  • Distributed systems: Based on the dispersed nature of installation locations, standardized configuration solutions are needed.
How competitive is your company's Type 2 DC SPD pricing?

As a professional manufacturer, we provide customers with competitive prices through mass production and technological advantages:

  • Cost advantage: Independent R&D and manufacturing of MOV chips, reducing intermediate links;
  • Economies of scale: Annual production of over 1.2 million units brings significant procurement and manufacturing cost advantages;
  • Technological value: Fully automated production lines ensure excellent product performance and lower total lifecycle costs;
  • Service value: Includes a complete solution of technical support, warranty services, and spare parts supply.
How to become an agent partner with your company and establish a long-term cooperative relationship?

Criteria for becoming an distributor partner:

  • Annual purchase amount reaches over 100,000 USD;
  • Significant influence in specific regional markets;
  • Possess professional technical service capabilities and market network;
  • Agree with our quality philosophy and service standards;
  • Willing to engage in long-term business planning and market development.

 

Cooperation process:

  1. Initial discussion: Understand mutual cooperation intentions and business plans;
  2. Sample testing: Provide product samples for comprehensive technical evaluation;
  3. Site visit: Welcome to visit our factory to gain an in-depth understanding of our production capabilities and quality system;
  4. Ttrial order: Verify product quality and service level through small batch orders;
  5. Sign agreement: Define the agency cooperation framework and specific terms;
  6. Establish team: Form a dedicated cooperation management team to ensure smooth progress of cooperation.

 

We have established agency partnerships with over 50 well-known enterprises globally, including famous electrical brands, equipment distributors, and installers. These successful cooperation cases demonstrate our cooperation philosophy and service capabilities. We look forward to developing together with more excellent partners and creating greater value in the global PV market. If you are interested in establishing an agency partnership, please contact our business team for detailed discussions. We will formulate a personalized cooperation plan based on your specific situation to ensure mutually beneficial long-term development.

If no relevant issues are found, please contact us, E-mail:info@letopv.com.

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Wenzhou LETOP Electric Co., Ltd.

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No. 19, Fenjin Road, Dongfeng Industrial Zone, Yueqing, Wenzhou, China 325604

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