Feature: 1. Stable Performance: SPD series graphite gap type surge protector (belonging to first class lightning protection device, 10/350us waveform) is designed according to IEC and GB standards. 2. Application: It is applied to the first level surge protection of the power supply of equipment systems in areas with a high risk of lightning strikes. 3. Safe to Use: It can prevent various surge currents including direct lightning strikes, and can be applied to single phase and three phase power supply lines through a combination of different numbers 4. Modular design: Standard 35mm/1.3in guide rail installation method, installed in the building's main power distribution cabinet (box), outdoor power distribution cabinet (box). 5. High Lightning Current Discharge Capability: No freewheeling, the maximum impulse current (10/350us) of a single module can reach limp‑25KA, and the maximum discharge current (8/20us) can reach maximum=150KA Specification: Item Type: Surge Protector Shell Material: Flame Retardant Nylon Product Size: Approx. 144x90x65.5mm / 5.7x3.5x2.6in Product Model: BEM-LYI25 Product Specifications: 4P25KA Rated Voltage: 220V/385V Maximum Sustainable Working Voltage: 385V Insulation Resistance: >100Mohm Impulse Current (10/350us): Peak Current: 25KA; Amount of Charge: 12.5AS; Energy: 156.25KJ/Q Maximum Discharge Current (8/20us): 150KA Nominal Discharge Current (8/20us): 25KA Voltage Protection Level: ≤2.5KV Response Time: ≤100nS Ambient Temperature: -40℃~+80℃ Protection Level: IP20 Equipped with Front Fuse: 125A Altitude: Not More Than 2000m/6561ft Relative Humidity: Not More Than 90% (25℃). Package List: 1 x Surge Protector Note: ①The indicator window of the module is green (normal). When the module deteriorates, the indicator window turns red and must be replaced in time;②The surge protector can be equipped with (FS) remote remote signal alarm. The remote signal contact has one normally open and one normally closed. If one or more modules of the surge protector fail, the contact will be closed and a fault alarm signal will be sent to indicate The module must be replaced if it fails.③Always check the air switch or fuse connected in series on the line.