A device that can automatically disconnect when the overvoltage and undervoltage in the circuit exceed the specified value, and can automatically detect the circuit voltage. It can automatically close when the voltage in the circuit returns to normal. Mainly used for household and shopping mall power distribution lines. Features: Real time protections of household electricity safety. The corresponding current size can be customized based on the electric field. If the electricity used in the dormitory is 5A, a 5A current limiting controller can be customized. If it exceeds 5A, the power will be automatically cut off. After the electrical equipment is unplugged, the current will return to within 5A, and it can also be automatically restored. Small size, simple wiring method, and very easy to use. Three dispaly, clear and convenient to view the current, voltage and electric degree. Equipped with a work indicator light, the electrical status is clear. Specifications: Type: CHLT-40, CHLT-63 (optional) Main color: white Rated voltage: 220VAC, 50/60HZ Rated operating current: CHLT-40: 40A CHLT-63: 63A Operating voltage range: 80-300VAC(singlephase) Electric current(＞A)setting range: CHLT-40: 1-40A CHLT-63: 1-63A Overvoltage(＞U)setting range: 230-300V Undervoltage(＜U)setting range: 140-210V Delay: 0.5s Reset delay: 1-600s Rated insulation voltage: 300V Item size: 85 * 66 * 37mm / 3.3 * 2.6 * 1.5in Item weight: 147g / 5.2ounce Package size: 90 * 80 * 42mm / 3.5 * 3.1 * 1.7in Package weight: 164g / 5.8ounce Packing List: 1 * Voltage Protector 1 * User Manual