A high-voltage arrester safeguards electrical systems from transient overvoltages (e.g., lightning strikes, switching surges) by diverting excess current to ground. Composed of metal-oxide varistors (MOVs) housed in weatherproof silicone rubber or porcelain insulation, it operates across 3 kV–550 kV systems. Key features include low residual voltage, high energy absorption, and rapid response (<25 ns). Designed for substations, transmission lines, and renewable energy installations, it features hydrophobic coatings, anti-pollution creepage design, and UV resistance. Compliant with IEC 60099 or GB 11032 standards, modern arresters integrate IoT sensors for real-time monitoring of leakage current, thermal performance, and degradation. Lightweight, corrosion-resistant, and maintenance-free, it enhances grid reliability, prevents equipment damage, and ensures operational continuity.