VPR21 numerical Relay is designed for 3-phase Over + Under Voltage and Over + Under frequency protection in low-voltage (LV) and medium-voltage (MV) power distribution systems. Its applications extend to protecting AC circuits, capacitors, generators, and motors, and it can be seamlessly integrated into automatic changeover schemes.

Built with a microcontroller-based draw-out design, the numrAL VPR21 numerical relay offers a wide range of configurable settings, including multiple Trip-Time Characteristics, precise Pickup settings, and a site-selectable voltage input of 110V, 240V, or 415V.