Feature: 1. OVERVOLTAGE AND UNDERVOLTAGE PROTECTION: When the voltage is too high or too low, the load side power supply is automatically disconnected to prevent electrical appliances from burning out, ensure electrical safety, and ensure the safe operation of electrical appliances. 2. AUTOMATIC OPERATION: When the power supply is unstable, its protection function will automatically activate. Once the voltage exceeds the limited range of the product, the protector will automatically cut off to defend the safety of electrical equipment. When the power supply returns to normal, the device will be powered back on within 1 minute. 3. PREMIUM STRUCTURE: The product circuit board adopts excellent electronic components, with reliable performance. Adopts PC flame retardant housing, suitable for long term use. 4. LIGHT INDICATOR: The green indicator light shows that the power supply is normal. The red indicator light shows overvoltage or undervoltage. 5. WIDELY APPLICABLE: Stable and reliable quality, achieving automation functions, applied to large scale production of household electrical products. Specification: Item Type: Voltage Protective Device Material: PC Flame Retardant Working Voltage: AC 230V 50Hz Rated Current: 40A Overvoltage Action Cut Off Value: AC 270V ± 5V Undervoltage Action Cut Off Value: AC170V ± 5V Overvoltage and Undervoltage Cutoff: Less than 1s Delay Time: 30 to 120S Installation: 35mm DIN rail . Package List: 1 x Voltage Protective Device Note: When connecting the product for the first time, it must wait for about 1 minute until the red light goes out before the product can function properly.