Surges, stemming from various factors, refer to abnormal voltages and the resulting abnormal currents.

Causes include “lightning surges” induced by lightning and “switching surges” resulting from the ON/OFF of the power supply.

Concerning “lightning surges,” power companies and communication providers implement diverse countermeasures, and specific surge-protective devices, such as surge tables, are available for purchase.




“Switching surges” pertain to surges occurring during circuit opening and closing. Caution is advised when large-capacity motors, generators, high-voltage circuits, solenoids, etc., are connected to the same power line.


f power supply circuits frequently experience damage, abnormal operations occur, or similar issues arise, surge protection may be necessary. Separating power lines can be a straightforward solution, and various surge protection devices are also available for purchase.