scope:

This part of IEC 61643 is applicable to silicon PN-junction voltage limiters (overvoltage protectors) used in power and information & communication technology (ICT) systems surge protective devices (SPDs) and equipment ports with nominal system voltages up to AC 1 000 V (RMS) and DC 1 500 V. This part of IEC 61643 provides information about silicon PN-junction voltage limiter junction arrangements, electrical characteristics, electrical ratings and application circuit examples in the following order: • Technology variants o forward biased semiconductor diodes o Zener breakdown semiconductor diodes o avalanche breakdown semiconductor diodes o punch-through semiconductor bipolar junction transistor diodes o fold-back semiconductor bidirectional transistor diodes • Component construction • Characteristics • Ratings • Application examples