LT-40 G Series PV Surge Protector 600-2000VDC Solar DC
A PV surge protective device is available for the DC side of solar photovoltaic systems, which helps to protect against the damage caused by transients due to lightning and switching. The company Leitai Electric specializes in manufacturing surge protection devices in China from its factory in Wenzhou, Zhejiang, where it tests every SPD before shipping it out.
Applications & circuit protection
The LT-40 G-series has been utilized for solar photovoltaic systems that have a DC voltage range from 600VDC up to 2000VDC, acting as protection for the inverters as well as the combiner boxes. It is used in the following installations
- Combiner Box: DC SPD at the combiner box for the protection of PV strings.
- Inverter: Protection provided for the DC input of the inverter.
- Utility Solar: Climate moderation within the high voltage DC systems. Utilized in off grid applications for DC bus and battery protection.
Schematic Diagram
The image above shows the internal protection circuitry and connectivity of the LT-40 G-series surge protective devices.
Construction & operating reliability
The LT-40 G-series uses high-energy MOV devices coupled with internal thermal disconnectors, thus ensuring high efficiency in clamping and a long lifespan. Each SPD device is assembled, aged and subjected to impulse testing before packing with operations report kept in accordance with each order for traceability purposes.
- High-energy MOV for quick and effective operation.
- Thermal disconnectors featuring visual failure indicator.
- IP20 rating of the device casing, UL94 V0 flameproof.
- Compliance with IEC 61643-11 / GB/T 18802.11 requirements.
PV Surge Protector Specifications & Technical Data
| Technical Data | Value |
|---|---|
| UcPV | 600-2000VDC |
| In | 20kA |
| Imax | 40kA |
| Up | 3.0kV |
| Iscpv | 500A |
Where to Buy PV Surge Protector at Factory Sales Prices
The cost of SPD varies based on its type, discharge capacity, voltage rating and quantity. Here, we refer to LT-40 G series as per our factory price list, which includes discounted prices for wholesale, OEM and project customers.
- Standard specifications as per our factory price list
- Custom configurations and volume discount offered
- Quotation provided as per your specifications
PV Surge Protector Wiring, Installation & Connection Guide
Install the LT-40_G series SPD between the live conductors and the earth using the shortest reasonable lead lengths and ensure polarity and terminal torque according to the data sheet. Protect the connection using the recommended external disconnector.
- Parallel connection using short leads to the PE terminal
- The external disconnector must comply with the specification
- Wiring diagram stated in the product documentation
Wiring Diagram
In the in-picture diagram, a standard wiring for the LT-40 G-series is shown according to the previous principles, including the letters for L, N and PE.
How Does PV Surge Protector Compare to Alternative Protection?
Next step is to select the surge protection device fitting the facility. In normal situations, a type 2 SPD would be applied in distribution boards, and only if direct lightning current is to be dealt with should type 1 or 1+2 units be chosen.
| Feature | This SPD | Alternative |
| Type | Type 2 (T2) PV SPD | Other SPD types available |
| Discharge capacity | 20kA / 40kA | Matched to network duty |
| Protection level | 3.0kV | Lower Up options available |
| Application | Solar PV DC | Other installation types |
Export Markets & Country Compatibility
Devices of the company Leitai have been used in more than 40 countries and are supplied with all necessary information formalizing their use.
SPD Dimensions, Weight & Packing
The compact and modular LT-40 G-series devices can be mounted directly on DIN rails in either distribution box.
The product documentation provides all necessary dimensional and packaging data.
- Compact DIN-rail design for cabinet installation
- The terminals will be protected during transport
- The dimension drawing will be provided for each model.
Dimensional Drawing
This dimensional drawing shows the installation footprint of the LT-40 G-series DIN rail mounting and panel setup.
Standards & certifications
The LT-40 G-series surge protection device complies with IEC 61643-31 and GB/T 18802.31 standards for photovoltaic systems. Type test and routine test documents can be provided based on project and market requirements.
- Design standard: IEC 61643-31 / GB/T 18802.31 (PV).
- Certifications: TUV, CE, CQC (by model).
- Markings and terminal polarity according to standards.
- DIN rail mountable as part of the installation panel.
OEM & B2B supply support
From small batches to bulk quantities, we offer assistance to OEMs, distributors and customers with special requests.
When your requirement does not meet our LT-40 G-series model specifications we are still happy to assist you with a customized offering based on your product requirements, production requirements, voltage and final quantity you need. Requesting a quotation has never been easier!
- Samples ready for evaluation.
- Flexible quantity available for both projects and B2B purchases.
- OEM and ODM support is available.
- Wide range of marking, branding and packaging options.
- Technical documentation and certificates support.
PV Surge Protector Buyer FAQ: What You Need to Know
Where is the LT-40 G-series installed?
LT-40 G-series is mounted on DIN rail in an enclosure on the DC side in between the solar array and the input of the inverter.
Can I order samples for testing?
Yes, it is possible to order samples as well as get wholesale pricing.
What is a PV SPD?
PV SPD helps save the solar energy system from lightning strike and switching surge volts before they destroy the system inverters and modules.
Does the LT-40 G-series include monitoring?
LT-40 G-series has options for remote signals depending on the configuration.
What DC voltages are supported?
LT-40 G-series supports up to 2000VDC ratings and it comes in products that will match the PV string voltage ratings.
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