Surge Protective Device

An SPD (Surge Protection Device) protects electrical systems from voltage spikes caused by lightning or switching. It absorbs excess voltage and directs it to the ground, preventing damage to sensitive equipment.

LSP offers Type 1, Type 2, Type 3, Type 1+2 and Type 2+3 surge protection devices for both AC and DC systems. We also supply specialized SPDs for wind turbines, data/data-over-Ethernet lines, PoE, LED lighting, PCB mounting, and DC combiner boxes.

LSP’s SPDs are suitable for domestic and industrial photovoltaic systems, solar farms, energy storage, e-mobility, wind turbines, water treatment, security systems, agrivoltaics, data centers, LED lighting, and radiocommunication.

LSP has focused on SPDs since 2010, with strict IEC/EN 61643-11 testing, high-quality LKD MOVs and Vactech GDTs, strong in-house R&D, custom designs, a 1,600 ㎡ certified factory and no MOQ. All SPDs pass surge, heat, salt spray and flame tests, come with fast lead times and a 5-year warranty — making them trusted for PV, wind, LED and more.

PV surge protection means installing surge protection devices (SPDs) to prevent damage to solar panels, inverters, and storage systems caused by lightning strikes and grid surges. Without it, expensive PV equipment can fail, reduce output, or even cause fire risks, especially in large solar farms or off-grid installations.

We offer PV surge protectors that use high-quality LKD MOVs and Vactech GDTs, with strong lightning withstand capacity (Type 1+2, In=20kA, Imax=40kA). The design includes moisture protection for outdoor use, low-temperature disconnection to prevent fire, and modular DC combiner boxes for easy installation in residential, industrial, or large-scale PV systems — all compliant with IEC/EN 61643-11 and supported by TUV, CB, and CE certifications.

Yes. EV charger surge protection is essential because EV chargers are sensitive electronic devices that can be damaged by lightning strikes and power surges. Surge protection helps prevent equipment failure, fire risk, and costly repairs, making it essential for both residential and commercial charging setups.

Lightning surge protection refers to the use of specialized devices to safeguard electrical systems from voltage spikes caused by lightning strikes. These spikes can damage equipment, cause fires, or interrupt operations. Lightning surge protection devices (SPDs) are installed at key points in the power system to divert excess voltage safely to the ground, protecting sensitive equipment in homes, commercial buildings, and industrial facilities.

The surge protection device working principle involves detecting overvoltage surges and diverting excess energy safely to the ground using components like MOVs or GDTs. This helps protect electrical equipment from damage caused by lightning or power spikes.

A surge protection device wiring diagram typically shows how the SPD is connected between the power lines (L, N) and the ground (PE). It illustrates the correct installation position—usually at the main distribution board—and the wiring method for single-phase or three-phase systems to ensure proper protection and grounding.

To install a surge protection device, first turn off the main power. Mount the SPD near the distribution board, then connect it to the incoming power lines and ground according to the wiring diagram. Ensure proper fuse or circuit breaker protection. Finally, restore power and check indicator lights for normal operation.