Features Nanosecond Surge Protection: Quickly opens within nanoseconds to divert surge overvoltage to the ground, safeguarding electrical equipment during lightning strikes or other surges. High Safety Standards: Made of PC flame retardant material, with built-in overcurrent, overheating, and temperature-controlled short circuit design for enhanced safety during operation. Modular Design for Simplicity: Easy to use and maintain, with low leakage current, faster response time, and low residual voltage, ensuring efficient and effective protection. Accurate and Stable Performance: Utilizes accurate electronic components for longer service life and stable performance, indicated by the visual window color for easy monitoring. Easy Installation: Installed by a standard 36MM guide rail, allowing simple installation and compatibility with distribution box circuit breakers. Specification: Item Type: Surge Protective Device Model: NL-PV40 Material: PC Maximum Continuous Working Voltage Uc: 1000V DC Nominal Discharge Current In: 20kA, 8/20μS. Maximum Discharge Current Imax: 40kA, 8/20μS. Voltage Protection Level Up: ≤3.5kV Pole: 3P Protection Grade: IP20 Working Temperature: -40℃ - 80 ℃, humidity: ≤90% under average 25℃. Package List: 1 x Surge Protective Device Package List 1 x Surge Protective Device