Voltage switching SPDs are designed to switch between two states, an "off" state and an "on" state, based on the voltage level. When the voltage level is below a certain threshold, the SPD is in the "off" state and allows the normal electrical current to pass through. When the voltage level exceeds the threshold, the SPD switches to the "on" state and shunts the excess voltage to ground, thereby protecting the connected equipment. The main function of voltage switching SPDs is to divert the surge to ground and to protect the equipment from overvoltage.
Voltage limiting SPDs, on the other hand, are designed to limit the amount of voltage that reaches the connected equipment. These SPDs clamp the voltage to a safe level and then dissipate the surge energy to ground. Voltage limiting SPDs are commonly used to protect sensitive electronic equipment that may be damaged by even a small voltage surge. It is recommended to install lightning surge protection devices in areas that are frequently struck by lightning or where sensitive electronic equipment is located.
In summary, voltage switching SPDs switch between an "off" state and an "on" state to divert the surge to ground, while voltage limiting SPDs manufactured by the surge protection devices manufacturer clamp the voltage to a safe level and dissipate the surge energy to ground. The choice of which type of SPD to use depends on the specific equipment being protected and the level of protection required.
As an international high-tech enterprise specializing in surge protector OEM and ODM, we have 15 years of lightning protection experience and advanced technology. Techwin lightning protector supplier has more than 1000 models of good quality surge protector, which can meet the lightning protection needs of various industries, and is widely used in the lightning protection of the whole building. Multi port surge protector, spike protection device, surge protection for led drivers, plug adapter, amps and voltage regulators. If you are interested in our products, please feel free to contact us!
90% of Projects Get Lightning Protection Wrong – This Critical Step Is Often OverlookedMay 16, 2026During the final acceptance inspection of many electrical projects, we often see a puzzling situation: “Everything seems to be done, but the system remains unstable.”Equipment is installed, surge pr...viewChoosing The Right Lightning Protection Device For Building ResilienceJanuary 10, 2024Ensuring the safety and resilience of buildings against lightning strikes is a paramount consideration in structural design and risk management. The choice of a lightning protection device for buildin...viewSurge Protector SPD Selection CriteriaMay 20, 2022The surge protector is divided into three levels according to the area that needs to be protected. The first level surge protector can be applied to the main power distribution cabinet in the building...viewFrequent Video Monitoring Failures in Wind Farms? The Problem Might Be HereApril 23, 2026Frequent Video Monitoring Failures in Wind Farms? The Problem Might Be HereIn the operational system of a wind farm, video monitoring plays a vital role in equipment inspection, safety management, and...viewHow do lightning or surges destroy equipmentMarch 6, 2026Lightning and surges damage equipment mainly through three destructive effects: overvoltage breakdown, overheating from excessive current, and magnetic induction damage. Here’s a clear, concise expla...viewProtection Measures Against Ground Potential RiseOctober 10, 2025In areas with frequent lightning activity, the ground potential rise caused by the grounding system enduring lightning current can lead to instantaneous elevation of the ground potential, forming a gr...view
EN
jp 
ko 
fr 
de 
es 
it 
ru 
pt 
ar 
vi 
th 
ro 
bg 
nl 
