Blogs

Step-by-step SPD wiring diagrams for single-phase, 3-phase, and solar. Covers Type 1, Type 2, DC, and IEC installation requirements.

SPD stands for Surge Protective Device. Learn how it protects electrical systems, the 3 IEC-defined types, and key selection parameters.

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.

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.

Learn what the TN-C-S earthing system is, how it differs from TN-S and TT, and how to configure your SPD correctly for PME installations.

Learn how to select the right surge protection device for solar panel systems — AC/DC placement, Type 1 vs Type 2, key IEC parameters explained.

Protect your outdoor Ethernet from lightning strikes. Discover why an IP68-rated RJ45 Surge Protection Device is essential for Gigabit and PoE networks.

Explore how metal oxide varistors (MOVs) serve as the core of surge protection devices (SPDs), their working principles, applications in power and telecom, and why using certified MOVs is critical for long-term safety and reliability.

Surge events destroy CCTV systems in two ways: a direct hit burns out cameras and NVRs instantly, while repeated low-level transients degrade image sensors and storage drives over months until the system fails without warning. Either way, the fix is the same — surge protective devices (SPDs) installed at both ends of every cable run that connects outdoor cameras to indoor equipment. This guide covers the specific SPD requirements for IP

The choice between 4+0 and 3+1 configuration in a three-phase SPD is not a preference — it is determined by your grounding system. Installing a 4+0 SPD in a TN-C system will expose the N-PE varistor to sustained overvoltage and burn it out. Installing a 3+1 SPD where it is not needed adds cost without benefit. The two configurations protect against different surge paths and are not interchangeable. What do 4+0

This article outlines the key differences between surge protectors and SPDs, beginning with what each term actually refers to, and provides guidance on how to choose the right type of surge protection based on system demands and risk exposure.

A Surge Protective Device (SPD), also known as a surge suppressor, is a device designed to limit transient overvoltages and divert surge currents. It contains at least one non-linear component, such as a Metal Oxide Varistor (MOV) or a Gas Discharge Tube (GDT), to achieve this protective function. The performance requirements and testing methods for low-voltage power SPDs are primarily detailed in the IEC 61643-11 standard, while their selection and application