As many of you may already know, the phenomenon known as tracking in AC/DC Power Adapters — Desktop & Wall-Mount occurs when moisture or dust accumulates around the plug inserted into an outlet, causing current to flow between the plug terminals. Repeated arc discharge results in carbonization of the insulating resin surface, forming a conductive carbonized path (track), which can ultimately lead to fire.

In general, as shown in the diagram below, a common countermeasure against this tracking phenomenon is to add an insulating cap at the base of the plug to increase its base height and prevent short circuits.

Because this countermeasure is so well known, we occasionally receive customer inquiries like, "Is your company's AC/DC Power Adapters — Desktop & Wall-Mount equipped with tracking protection?"

In our company, there have been past cases where insulating caps posed an obstacle during safety certification (such as UL). Therefore, for wall-mount type AC/DC Power Adapters — Desktop & Wall-Mount, we have long adopted a design that includes a groove between the two AC plug terminals to prevent tracking.

This method offers performance equivalent to that of the insulating cap type. Naturally, it complies not only with PSE but also with plug standards like UL and BSMI, so you can use it with confidence.