It's not an ESD or a surge tester; the manufacturer doesn't even pay much attention to differentiate between the two. Surge testing is done with well-defined wa

It's not an ESD or a surge tester; the manufacturer doesn't even pay much attention to differentiate between the two. Surge testing is done with well-defined waveforms like 8/20us pulses of specific voltage; ESD testing is done by discharging a specific voltage from well-defined source like 150pF/330R. This one is simply advertised as "powerful", meaning it doesn't respect those specs. To elaborate: surge/ESD protection components work on the basis of thermally dissipating incoming energy that exceeds voltage threshold. They're specifically designed to clamp single, short, high-energy pulses - not repeated pulses or constant voltage. A TVS or MOV will overheat & explode if you subject it to DC higher than its breakdown voltage, or if you subject it to repetitive load - they're simply not designed & rated for that because it's not what happens in the real world. You just don't get repetitive lightning strikes or repetitive ESD discharges in real life, and they don't protect against that. TL;DR: With enough voltage & current you can fry anything and that's what the device does.