A surge protection device installed at the main electrical service entrance to protect against lightning-induced surges and high-energy transient overvoltages.
Type 1 SPDs are installed on the supply side or line side of the main distribution board, where permitted by local electrical codes and standards. They are designed to discharge high-energy surge currents from direct or nearby lightning events and switching transients.
Common Features
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High surge current capacity
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Metal Oxide Varistor (MOV) and/or spark gap technology
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DIN-rail or panel mounting
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Status indicator
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Replaceable protection modules (on many models)
Common Use
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Main service entrance protection
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Lightning surge protection
Common Types
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Single-Phase Type 1 SPD
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Three-Phase Type 1 SPD
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Combined Type 1+2 SPD
Advantages
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Handles high-energy surges
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Protects the entire electrical installation
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Improves equipment reliability
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Long service life
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Fast response
Common Applications
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Commercial buildings
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Industrial facilities
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Distribution substations
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Hospitals
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Data centers
