While both devices protect against voltage spikes, their application and scale are very different.

• Surge Arresters are robust, high-voltage devices used on primary electrical systems (overhead lines, substations). They are designed to handle extremely high currents from lightning and switching surges and are rated for the high voltages of the grid, from distribution (e.g., 10 kV) to ultra-high-voltage (e.g., 500 kV) lines.

• Surge Suppressors (often called surge protectors) are smaller, low-voltage devices designed for secondary electrical systems, like the wiring in a home or office. They protect sensitive electronic equipment (computers, TVs, etc.) from smaller, more frequent voltage spikes that might come from the building's wiring or the local grid.

At Ningbo Changshi, we focus on the primary electrical system, providing the tools and equipment needed to install and maintain the large-scale surge arresters that are the first line of defense for the entire grid.