Technical data: Rated current: 40A\r\nRated voltage: 220V\r\nFrequency: 50Hz\r\nElectri intension:voltage 2000V/min \r\nShell safety grade: IP2L3\r\nBurning resistance : level FV-0 \r\nHeat-Shape temperature: ≥180°C \r\nElectric arc resistance:≥180sec \r\nRelative leakage track exponent: ≥600CTI V Structural specifications: This type of ammeter box is with separable design and assemble.It can be assembled by fixing the DLBX type 4KW boxes together and with high level of safety by using invisible wiring,copper band joining inside the box and special connective bands between two boxes.It"s made up of FRP compound material,corrosion resistant,insulative and with excellent burning resistance,beautiful shape,Long-lasting.