Type 2 Surge Protection Device (SPD) is designed to protect electrical installations and connected equipment from indirect lightning-induced surges and switching overvoltages originating within the power network. It is the most commonly used SPD and is typically installed at sub-distribution boards (SDBs), main distribution boards (MDBs), or control panels, downstream of a Type 1 SPD or where no external lightning protection system is present.
Type 2 SPDs effectively limit transient overvoltages (8/20 μs waveform) to safe levels, preventing damage to sensitive equipment such as PLC systems, VFDs, automation panels, computers, medical devices, CCTV systems, and communication equipment. By clamping excessive voltage and safely diverting surge energy to earth, the device ensures system reliability, reduced downtime, and extended equipment life.
These SPDs are suitable for residential, commercial, and industrial applications, especially in areas prone to voltage fluctuations, switching operations, and lightning activity. Type 2 SPDs are available in multiple configurations to suit single-phase and three-phase systems, and are compatible with TN, TT, and IT earthing systems.
Key Features & Benefits
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Protection against indirect lightning surges and switching transients
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Tested with 8/20 μs surge current waveform
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Low voltage protection level for enhanced equipment safety
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Ideal for distribution boards and control panels
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Compatible with various earthing systems (TN / TT / IT)
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Plug-in replaceable modules for easy maintenance (model dependent)
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Visual fault indication and optional remote signaling contacts
Applications
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Residential and commercial buildings
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Industrial electrical panels and automation systems
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Data centers and IT infrastructure
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Hospitals and laboratories
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Solar PV and renewable energy systems
A Type 2 SPD provides a critical layer of surge protection, minimizing the risk of equipment failure due to transient overvoltages and ensuring stable, uninterrupted operation of electrical systems.











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