[Automatic protection function]: When the power supply is unstable or exceeds the range, the protection function of this 230v 40a voltage protection device will be automatically activated to protect the safety of electrical equipment and personnel [Quick return to normal] : when the power back to normal, this under voltage automatic reconnect, the device will be power again in 1 minute [Indicator light]: The red light of this voltage reconnect device indicates that the power is normal, the red light indicates overvoltage or undervoltage [High-quality electronic components]: This overvoltage and undervoltage protection device circuit board uses high-quality electronic components, reliable percompatiblemance [High-quality electronic components ]: This overvoltage and undervoltage protection device circuit board uses high-quality electronic components, reliable percompatiblemance overvoltage and undervoltage protection device voltage protection relay over and under voltage automatic reconnection 230v 40a voltage protection device voltage reconnection device Features: - Automatic recovery over voltage and under voltage protection devices meet modular design standards. - The product board uses high quality electronic components compatible reliable percompatiblemance. - When the power supply is unstable, its protection function will be active automatically. Once the voltage exceeds a product limit range, it will automatically cut off to protect the safety of electrical equipment and personnel. -When the power returns to normal, the device will turn it back on in 1 minute. - The green indicator light indicates that the power supply is working properly. Red light indicates over voltage or under voltage. Specification: Function: Over voltage under voltage protection Rated AC voltage: 230V 50Hz Maximum transmit current: 40A Maximum power: 8.8KVA Over voltage action cut-off value: > 270VAC+/-5V Normal voltage: 175-270VAC Undervoltage action cut-off value: