What does SPD stand for in electrical protection terminology?

• A. Surge Protection Device
• B. Surge Power Drive
• C. Shielded Protection Diode
• D. Static Protection Device

Answer: (A)

SPD stands for Surge Protection Device. In electrical protection, this refers to equipment designed to limit transient voltage spikes and divert or absorb surge energy so that protected circuits and devices aren’t damaged by lightning, switching, or other disturbances. These devices are placed at points of entry or near sensitive equipment and come in common types like metal-oxide varistors, gas discharge tubes, and transient voltage suppressors. The other terms aren’t standard designations in this context, so they don’t describe the function of protecting against voltage transients the way Surge Protection Device does.