Standard: IEC/EN60947-3 GB/T14048.3 Rated working current (In): 32-125A Rated working voltage( Ue): AC 230/400V The number of poles: 1P/2P/3P/4P Rated operating frequency: 50/60Hz Rated insulation voltage (Ui): AC 500V Rated impulse withstand voltage (Uimp): 4kV Mechanical/electrical life: 8000/1500 Times