Features: Fully automatic overvoltage and undervoltage protector designed for single-phase AC voltage (230V, 50/60Hz) with a rated working current of up to 63A. Suitable for residential household distribution boxes or protection of single-phase electrical equipment. Automatically disconnects power supply in case of overvoltage, undervoltage, or overcurrent conditions to protect connected devices. Restores power automatically when voltage returns to normal range. Specifications: Item Type: Over/Undervoltage Protector Material: Plastic Overvoltage Threshold: Adjustable between 230–300V Undervoltage Threshold: Adjustable between 145–210V Dimensions: Approx. 36 × 85 mm (1.42 × 3.35 in); 65 × 45 mm (2.56 × 1.77 in) Color: White Quantity: 1 piece Note: No retail packaging included. 1 cm = 10 mm = 0.39 inch. Slight measurement variations (up to 1 cm) may occur due to manual measurement. Screen settings may cause slight color differences between images and actual product. Package Includes: 1 × Over/Undervoltage Protector (Other accessories shown in images are for demonstration only and not included.)