Features [Ensure safety] This overvoltage and undervoltage protection can manually adjust the overvoltage, undervoltage and over-current protection values to give the devices a safe feeling. Stable voltage: this voltage protector prevents frequent switching on and off unstable voltage from causing additional damage to devices, and provides secondary protection. Dual display: On the protector there are two displays with clear digital display for your convenience and reading. PC shell: The protection is made of flame retardant PC material as a shell, which significantly improves safety when using. Multiple functions: This current and voltage protection has the functions selection of reset mode, error retrieval and factory reset recovery. Specification: Item type: surge protection device Material: flame retardant PC. Current: 63 A. Surge protection range (UVO): 240V-300V Value range of undervoltage protection (uve): 140V-210V. Shut-off delay time: 2s (can be set between 1 and 300s) Self-recovery protection delay time: 30s (can be set to 1-300s) Rated frequency: 50/60 hours Error: 2% Voltage measurement accuracy: 1% Nominal insulation voltage: 400 V. Output contact: 1 no. Electrical life: 100,000 times. Mechanical service life: 1,000,000 times. Protection class: IP20. Height: ≤ 2000 m. Working temperature: -50℃-55℃. Humidity: ≤50% at 40°C (non-condensing). Humidity temperature: -30℃-70℃. Package list: 1 x surge protection device Package List 1 x Over Under Voltage Protective Device