The OUVT-X1 Over-under Voltage Release is a key accessory designed to be assembled with circuit breakers NXB-63 or NXB-40 to provide automatic protection against abnormal voltage conditions. It precisely trips the breaker when voltage is too low or too high and crucially prevents reclosing until the voltage returns to a safe range. This ensures circuit stability and vital equipment safety, safeguarding sensitive loads from damaging fluctuations. With adjustable trip settings and delay times, the OUVT-X1 offers an integral solution for enhancing safety and reliability across residential, commercial, and industrial applications.