AC surge protector fast response 36mm 4P rail mounting surge protection device 20 - 40KA 420V Feature:1. Main Application: This surge protector is mainly used to defend electrical systems and equipment from transient lightning and surge loads.2. Quick Response: When abnormal situation occurs in the circuit, the protector will open quickly in nanoseconds, defend the circuit's safety quickly and effectively.3. PC Shell: The surge protector shell is made of PC material, which is flame retardant and flame retardant, effectively protect the exact chip which is the core of the protector.4. Good Build Quality: The protector is well made with a modular design that is very easy to use and maintain.5. Easy to Install: Featuring compact size and rail installation, easy installation can be quickly completed in a few steps. Specification: Item Type: AC Surge Protector Material: Fireproof PC Maximum continuous operating voltage Uc: 420V AC Nominal discharge current w: 20kA (8/20 mu ;s)Maximum discharge current Imaximum: 40kA (8/20 mu;s) Voltage protection level: less than or equal to 1.8kvNumber of poles: 4PMounting: 36MM rail Protection class: IP20 Operating temperature: -40 to 80, humidity: less or equal 90% (average 25) Package List: 1 x AC Surge Protector