A surge protector like this one manufactured by the reputable brand Mora is an appliance or device designed to protect electrical devices from voltage and current spikes. A surge protector attempts to limit the voltage supplied to an electric device by either blocking or shorting to ground any unwanted voltages above a safe threshold Features: Protects against overvoltage, undervoltage, and overcurrent Built-in KWH meter for energy monitoring Quick and accurate relay response Compact and easy-to-install design Durable and long-lasting construction Specifications: Rated working current: 63A Overvoltage protection value: AC 230V – AC 275V Factory default 275V Under voltage protection value: AC 160V – AC 220V Factory default 175V Automatic closing delay: 0-30 seconds Factory default 30 seconds Over-current protection value: 0-40A Factory default 63A Display range of effective voltage 70-400V Display range of effective current 0-99.9A Withstand lightning surge voltage in the range of 5kV 8 modular contour design and guide-rail mounting Rated working voltage: AC 230V, 50Hz Dimensions: 80 x 37 x 66 mm (L x W xH) Uses: Industrial motor protection Electrical panel and distribution protection Commercial building energy monitoring Residential electrical safety Complete protection for machines and equipment Package Includes: 1 x MORA 63A OVER AND UNDER VOLTAGE AND CURRENT PROTECTION RELAY