NJB1-Y single phase voltage relays ( hereinafter the relay for short) are applied in AC 220V, 110V, 24V, frequency 50Hz ( or 60Hz) and DC 24V control circuits as single phase overvoltage protection or under-voltage protection and indication elements, making or breaking circuits as intended operating values and time. The product are in compliance with requirements of standard IEC 60947-5-1