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Surge Protective Devices (SPDs)

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About Surge Protective Devices (SPDs)

Surge protective devices (SPDs) are designed to protect equipment against temporary excess voltage and/or current. They differ in terms of signal protection type. Dataline and DC signal surge suppressors protect against transient overvoltages on data or DC signal lines. Single-phase surge suppressors protect equipment from transient overvoltages on single-phase AC power lines. By contrast, three-phase surge suppressors protect equipment from transient overvoltages on three-phase AC power lines. Other types of transient voltage surge suppressors are also available. 

Selecting surge protective devices (SPDs) requires an analysis of performance specifications such as maximum surge current, AC energy absorption, DC energy absorption, maximum AC power, maximum DC power, and operating temperature. Maximum surge current is the maximum current allowed for a single impulse waveform with a continuous voltage applied. Both AC energy absorption and DC energy absorption measure the ability of transient voltage surge suppressors to absorb heat energy created by transient surges. 

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Engineering Web: Surge Protective Devices SPDs

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Surge Protective Devices Overview
What is the Surge Protective Devices Committee (SPDC)?
NEMA - Low Voltage Surge Protective Devices Section
Low Voltage Surge Protective Devices Surge Protection Surge Protective Devices Low-Voltage Surge Suppression Receptacles
See National Electrical Manufacturers Association Information
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Monitoring SPDs Monitoring of surge-protective devices in low-voltage power distribution systems
See Electronics and Electrical Engineering Laboratory Information
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