The MK232A is a microprocessor-based numerical earth-fault relay that uses fundamental frequency current measurement for harmonic rejection. It has independent low-set and high-set elements, with the high-set element configurable. The relay has 4-digit display, two output contacts, soft switches for configuration, and IDMT or definite time trip characteristics. It is panel-mountable with dimensions of 96x96x110mm and has current and voltage ratings for protection applications.