Understanding IEC overvoltage categories with CUI INC

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To design electrical equipment that is capable of withstanding likely transients and to ensure reliability and safety, engineers should be familiar with the overvoltage categories (also known as installation categories) defined by the IEC.

CUI has a range of standard power supplies for Category II and III applications. Standard internal AC-DC power supplies such as the VGS-100W series are designed for Category II applications. Series such as the VGS-100D are designed with higher input-overvoltage capability for use in Category III fixed installations. Both series incorporate robust design features, with output over-voltage, short-circuit, and over-current protection built-in, a wide input-voltage range up to 305 Vac, and IEC/EN/UL 62368 general safety certification. The units also comply with IEC/EN 61558 for power supplies and transformers, and IEC/EN 60335 for household appliances.


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