Web Reference: Feb 28, 2026 · Learn the differences between Type 1, Type 2, and Type 3 SPDs. Understand surge protection device types, installation, technical features, and applications to protect your electrical systems from lightning and voltage surges. Dec 12, 2025 · Understanding the difference between Type 1 vs Type 2 vs Type 3 SPD is the starting point for every correct surge protection specification in IEC markets. Each type handles a specific surge threat at a specific location; none can substitute for another. Type 1 SPDs are typically installed on the line side of the service entrance, offering protection from external surges and direct lightning strikes. Type 2 SPDs are installed on the load side of the service entrance or distribution panels, providing protection from internal surges and indirect lightning strikes.
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