Safety Capacitor X Capacitance and Y Capacitor Selection Method

Safety capacitor safety class, insulation type, rated voltage range:

Y1 double insulation or reinforced insulation ≥250V

Y2 basic insulation or additional insulation ≥150V≤250V

Y3 basic insulation or additional insulation ≥150V≤250V

Y4 basic insulation or additional insulation <150V

The capacitance of the safety capacitor Y capacitor must be limited to achieve the purpose of controlling the leakage current flowing through it under the rated frequency and rated voltage and the impact on the EMC performance of the system. The capacity of the commonly used Y capacitor should be no more than 0.1uF. In addition to complying with the corresponding grid voltage withstand voltage, the safety capacitor Y capacitor also requires sufficient safety margin for electrical and mechanical performance to meet the IEC 60384-14 international standard. To avoid breakdown and short circuit under extreme environmental conditions, the pressure resistance of Y capacitor is important for protecting personal safety.