12P Rail Installation: The voltage arrester device adopts 2P rail installation, the installation is very simple 2PC Flame Retardant Material: The shell of the voltage arrester is made of PC flame retardant material, safer to use with high quality and excellent performance 3Visual Window: Come with visual window, traffic lights indicate power on and off at a glance 440kA Maximum Discharge Current: Maximum discharge current for 40kA, nominal discharge current is 20kA, and voltage protection level is 3.5kV 5Excellent Performance: Surge protective devices come with stable structure, excellent performance and long service life Item Type: Surge Protective Devices Product Material: PC Product Model: FXD1-PV40 Maximum Discharge Current: 40kA Nominal Discharge Current: 20kA Voltage Protection Level: 3.5kV Level: 2P Installation Method: Rail installation 2 x Surge Protective DevicesUsed for maintenance and installation related to electricity. Make sure that the operator has the qualification for electrician work and take necessary protective measures such as power off and insulation.