What Happens If You Continue To Use A Malfunctioning Wall Switch?

Aging or loosening of the internal contacts of Wall Switch can lead to increased contact resistance. According to the principle of circuit heating, current flowing through faulty contacts generates localized high temperatures. Prolonged operation under these conditions may cause the plastic casing to soften and deform, and the internal insulation material to gradually carbonize. During peak electricity usage at night, the temperature will rise further when the load current increases, potentially igniting nearby flammable materials.

Wall switches are typically rated for 10A or 16A. When a switch fails to disconnect the circuit properly due to internal component damage, the electrical appliance remains energized even when the switch is pressed. In this uncontrolled situation, the continuous flow of overload current through the damaged switch can cause a serious fire within a short period.