Surges are abnormal voltages and resulting abnormal currents caused by various factors.

Causes include “lightning surges” caused by lightning and “open/close surges” caused by turning power supplies on and off.

Electric power companies and telecommunication companies have taken various countermeasures against lightning surges.

Table taps for lightning surges are also available.




A “open/close surge” is a surge that occurs when a circuit is opened or closed.

Be careful when large capacity motors, generators, high voltage circuits,

solenoids, etc. are connected to the same power line.

If the power supply or power circuit is frequently damaged or operates abnormally,

it may be necessary to take surge countermeasures.

In some cases, simply separating the power lines may be sufficient.

Various surge suppression products are available.