The ADR132A is member of Ashida Numerical Relay family (Aditya Series) design to meet demand of low and medium switchgear control. The ADR132A is basically 3 phase Under/Over voltage protection with definite time. The ADR132A continuously monitors all 3 phase voltage, through PT connections. The high-speed micro-controller samples this voltage sine wave through a 12 bit A/D converter. The microcontroller performs powerful Digital Algorithms to find out Amplitude of voltage signal, and then this value is use for protection and metering function.