Ceritified
ISO9001, CE, TUV ,CB, RoHS
Product Range
5000+ Specifications
Services
ODM & OEM
ISO9001, CE, TUV ,CB, RoHS
5000+ Specifications
ODM & OEM
Combined lightning and surge protection for AC main power systems. Reliable SPD supplier with IEC certified designs.
PV and DC circuit protection against lightning and transient surges. Ideal for solar inverter systems and DC networks.
Primary surge protection at the service entrance. GA&DA provides high-discharge SPDs for industrial and building power systems.
Protect sensitive data, control, and communication lines from voltage spikes. Ideal for PLCs, telecom, and automation systems.
Secondary surge protection for distribution boards and critical equipment. Compact modular SPDs for AC networks.
Type 2 DC SPD for solar panels and inverters, providing fast response and stable voltage control. Certified by IEC/EN 61643.
All GA&DA SPDs are tested to international surge protection standards, ensuring consistent performance and safety across all voltage levels.
We support custom logo, packaging, and technical configurations for global distributors and brand owners.
A Surge Protection Device (SPD) is an electrical safety component designed to protect equipment and installations from transient overvoltage — short-duration voltage spikes caused by lightning strikes, power switching, or grid disturbances.
When a surge occurs, the SPD diverts the excess voltage to the ground, limiting the voltage that reaches your equipment. This prevents damage to sensitive electronics such as inverters, control systems, or communication modules.
Surge protection devices are typically installed in main power distribution panels, sub-distribution boards, solar photovoltaic systems, and telecommunication networks.
According to the IEC/EN 61643 standard, SPDs are categorized into different types:
Type 1 SPD – provides lightning current discharge protection at the service entrance.
Type 2 SPD – provides residual surge protection for downstream distribution boards.
Type 3 SPD – offers fine protection for end equipment.
Signal SPD – protects data, control, and telecommunication lines.
Choosing the right SPD type depends on the system voltage, exposure risk, and installation location.
As a professional surge protection device manufacturer, GA&DA designs and produces Type 1+2 AC/DC SPDs, Type 2 surge protectors, and signal surge protectors for use in industrial, commercial, and solar applications.
A surge protection device works as a voltage limiter. It is connected in parallel with the power supply of the system it protects.
Under normal operating voltage, the SPD remains inactive, presenting high impedance.
When a voltage surge occurs — for example, due to lightning induction or switching transients — the SPD immediately activates and diverts the excessive current through its internal components, typically MOVs (Metal Oxide Varistors) or GDTs (Gas Discharge Tubes), safely to ground.
After the surge passes, the SPD automatically resets to its high-impedance state, ready for the next event.
This fast response and self-recovery behavior make SPDs an essential element in all modern electrical installations, especially in solar PV systems, industrial control panels, and communication networks.
| SPD Type | Description | Typical Applications |
|---|---|---|
| Type 1 SPD | Installed at the service entrance to discharge high lightning currents (up to 100kA). | Power distribution, building entrance panels |
| Type 2 SPD | Provides residual surge protection at sub-distribution level. | Industrial control systems, machinery panels |
| Type 3 SPD | Fine protection for sensitive end devices and electronics. | Computers, sensors, automation modules |
| Signal SPD | Protects low-voltage data and communication lines. | PLCs, telecom networks, instrumentation |
| Type 1+2 SPD | Combined protection for both lightning and switching surges. | Solar inverter systems, industrial equipment |
You can fill out the form on this page or email us directly at info@cngdfl.com Our engineering and sales team will respond within 24 hours with datasheets and pricing.
