Technical data: Rated voltage: 380V\r\n Rated current:40(63)A\r\n Frequency:50HZ \r\n Electri intension:voltage 2000V/min\r\n Oxygen exponent: OI≥30 \r\n Burning resistance : level FV-0 Structural specifications: Made up of compound material,this type of ammeter box is with separable design and assemble.Beautiful and novel shape, Long-lasting,insulative,burning resistant,high level of safety,Shell safety grade: IP2L0.