Industrial power systems feature high power load, frequent equipment switching, complex electromagnetic interference, and harsh operating environments, making Surge Protective Devices critical for reliable industrial power operation. SPDs are applied in every key link of industrial power distribution, from general power intake to terminal equipment protection, forming a complete multi-level surge protection system.
At the factory total power intake level, Type 1 SPDs are installed at the low-voltage inlet of industrial power distribution rooms. They are designed to withstand and discharge high-energy lightning surges and extreme transient overvoltages invading from external power grids, providing primary lightning protection for the entire factory power system and preventing large-scale power system paralysis caused by direct lightning impacts.
At the workshop branch distribution level, Type 2 industrial-grade SPDs are installed in workshop distribution cabinets and branch power boxes. They suppress residual overvoltages after primary protection and absorb internal industrial surges generated by frequent start-stop of large motors, frequency converters, and mechanical equipment. This eliminates voltage fluctuations in branch circuits and stabilizes the power supply of workshop production equipment.
At the terminal equipment level, Type 3 precision SPDs are deployed in front of industrial precision equipment such as PLC controllers, industrial sensors, detection instruments, and automated robotic arms. These devices eliminate tiny residual surge interference that cannot be filtered by primary and secondary protection, protecting sensitive electronic components and control chips from subtle overvoltage damage and ensuring precise operation of industrial automation systems.
In industrial weak current and signal systems, dedicated signal SPDs are applied to industrial control signal lines, Ethernet communication lines, and sensor transmission lines. They prevent surge-induced signal distortion, transmission interruption, and instrument data errors, ensuring accurate and stable signal interaction of industrial control systems.
In addition, for special industrial scenarios such as chemical plants, coal mines, and high-temperature and humid workshops, explosion-proof and waterproof industrial SPDs are adopted. These specialized devices adapt to harsh industrial environments, maintain stable protection performance, and avoid safety hazards caused by surge damage to explosion-proof electrical equipment.