... voltmeter is a kind of programmable electrical digital meter. It can measure 3 phase voltages accurately. With 4 keys on the front panel ... ,VL2,VL3 or VL12,VL23,VL31 - PT ratio: Programmable- Voltage: AC 3x120/220V, 3x230/400V, 3x400V overload: 480V (continuous); 800V during ... contact; 1A/30VDC,5A/250VAC (to control other equipments)4.Panel Size: 48x48mm; 48x96mm, 72x72mm; 80x80mm, 96x96mm,120x120mm