GKRC-02 UNO Voltage Monitoring Relay for reliable protection of 3-phase electrical systems against abnormal voltage conditions. Designed for 380/400V 3-phase, 4-wire systems, this DIN-rail mounted relay monitors under-voltage and over-voltage conditions and provides adjustable operating limits and time delays. Features adjustable minimum voltage: 150–210V, maximum voltage: 240–300V, reset delay: 0.1–20 seconds, and delay: 0.1–20 seconds. Rated supply220XXXXXX