Analysis Of Arc Phenomenon Of Wall Switch In Electrical System

As a common control device, the internal contacts of the Wall Switch may generate visible sparks during the switching process. These sparks are actually electric arcs, a discharge phenomenon that occurs when switch contacts separate under load current, causing current to seek a path across the contact gap. Arc formation involves the breakdown of air or a dielectric by an electric field, leading to the formation of conductive channels between electrons and ions between the contacts, resulting in a high-energy discharge for a brief period.

Arcing in wall switches is not uncommon, and is particularly noticeable in certain usage scenarios. When internal wiring is loose, contacts age, or the load type causes current fluctuations, the current crossing the contact gap can create a momentary discharge, producing a spark or light. Prolonged arcing accelerates the oxidation and erosion of the internal contact materials, affecting switch lifespan and potentially causing more complex electrical problems.