How SPD Surge Protective Device Works

With the development of technology, there are more and more types of electronic products, and their application fields are also becoming wider and wider. However, the withstand voltage level of these electronic products is generally lower than that of low-voltage distribution devices.

Therefore, they are easily damaged by voltage fluctuations, namely surge voltage.SPD surge protective device manufacturer tells you the so-called surge, also known as transient overvoltage, is an instantaneous voltage fluctuation that occurs in the circuit, usually lasting for about one millionth of a second. 

For example, in lightning weather, lightning pulses can cause voltage fluctuations in the circuit.In a 220V circuit system, there will be continuous and instantaneous voltage fluctuations that can reach 5000 or 10000V, namely surges or transient overvoltages. There are many lightning zones in China, and lightning is an important factor in generating surge voltage in power lines. Therefore, it is necessary to strengthen lightning protection in low-voltage distribution systems.SPD surge protective device manufacturer tell you,The surge protector is an overvoltage protector. 

SPD surge protective device working principle is that when there is an instantaneous overvoltage on the power line or signal transmission line, the surge protector will release the overvoltage to limit the voltage within the range that the equipment can withstand, thereby protecting the equipment from voltage surges.
Under normal conditions, the surge protector is in a high resistance state and does not leak current; When overvoltage occurs in the circuit, the surge protector will be triggered in a very short period of time, leaking the energy of the overvoltage to protect the equipment; After the overvoltage disappears, the surge protector returns to a high resistance state without affecting the normal power supply.