High-Precision Annular Through-Core Current Transformer for Cable Line Leakage Current Monitoring

This YAONAN 4-pole Surge Protective Device (SPD) is a high-reliability protective component engineered specifically for low-voltage electrical distribution systems, designed to shield residential, commercial, and industrial electrical equipment from the damaging effects of transient voltage surges.

Featuring a compact, modular 4-pole structure (configured as 3 live lines “L” plus 1 neutral line “N”), this SPD is optimized for standard DIN rail installation— a ubiquitous mounting method in electrical switchgear and control panels, allowing for straightforward integration into existing electrical setups without extensive modifications.

Its technical specifications reflect its robust protective capabilities: The rated operating voltage (Uc) of 385V/- is calibrated to match the voltage parameters of typical 3-phase 380V power grids, ensuring stable, continuous operation under normal working conditions. With an impulse current (Iimp) and nominal discharge current (In) rating of 15kA, the device can safely divert large transient currents (such as those triggered by lightning strikes, power grid switching operations, or equipment startup/shutdown surges) away from connected circuits. Critically, its maximum limiting voltage (Up) is restricted to ≤1.8kV—this key metric guarantees that the voltage transmitted to downstream devices stays within a safe, equipment-compatible range, effectively preventing surge-induced burnout or malfunction.

Compliant with both China’s national standard GB/T 18802.1 and the international IEC 61643-1 standard, this YAONAN SPD adheres to stringent global benchmarks for surge protector safety, performance, and durability. These certifications validate its ability to withstand repeated surge events while maintaining consistent protective performance over its operational lifespan.

Ideal for safeguarding both sensitive electronic equipment (including programmable logic controllers, frequency converters, and precision measuring instruments) and general electrical appliances, this SPD plays a pivotal role in minimizing unplanned equipment downtime, reducing maintenance and replacement costs, and extending the operational longevity of connected electrical systems.