DC Surge Protection Device: Selection Guide for EV Charging, Solar and Industrial Systems
DC surge protection devices protect EV chargers, solar, telecom and industrial DC systems. Learn how DC SPDs work, key parameters, and wiring types.
Blogs
How to Choose an SPD Manufacturer: A Practical Buyer’s Guide
How do you choose an SPD manufacturer you can rely on? Six criteria — certifications, datasheet transparency, OEM capability, and sample readiness — that procurement teams use to qualify suppliers.
TT Earthing System: Wiring, Diagram and SPD Setup
A TT earthing system (Terre-Terre) has the source neutral earthed at the transformer, while the consumer installs their own independent
TN-S Earthing System: Wiring, Diagram and SPD Setup
Learn what a TN-S earthing system is, how it differs from TN-C-S and TT, and how to configure your SPD correctly for TN-S installations.
SPD Wiring Diagram: Single Phase, 3 Phase and Solar SPD
SPD wiring diagrams for single-phase, 3-phase and solar systems, covering connection methods for TN-S, TT and IT earthing systems and IEC 61643-11 requirements.
What Is an SPD in Electrical Systems? Types & Wiring
SPD stands for Surge Protective Device. Learn how it protects electrical systems, the 3 IEC-defined types, and key selection parameters.
Type 1 vs Type 2 vs Type 3 SPD: Which Level Do You Need?
Type 1, Type 2, and Type 3 SPDs differ by location and surge waveform. Learn which type your project needs and when a Type 1+2 is the right choice.
Gas Discharge Tube (GDT): How It Works in SPD Systems
Learn what a gas discharge tube is, how it works, and how GDTs are used in SPDs. Covers 2-electrode vs 3-electrode types and GDT vs MOV comparison.