In modern power systems, the use of direct current (DC) power supplies is becoming increasingly popular, especially in areas such as renewable energy and electric vehicles. With the widespread use of DC power supplies, the risk of overvoltage faced by electrical equipment has also increased.

Therefore, DC surge protective devices (SPDs) have become an important tool for protecting electrical equipment. This article will explore the definition, working principle and importance of DC surge protective devices in practical applications.

DC surge protective devices play a vital role in protecting electrical equipment, extending equipment life and improving system reliability. With the continuous expansion of DC power supply applications, it is particularly important to understand and apply these protective devices. By reasonably selecting and installing DC surge protective devices, the risks caused by overvoltage can be effectively reduced and the safe and stable operation of the power system can be ensured.