1,Delay power cut for overload 2,Automatically display the accumulative energy, power and current date & time, etc. 3,Advanced technology of Protecting against tamper & fraud Function: A fire with anti-1, the zero line disconnected, current shunt, current reverse features a variety of Fault Tolerant Applicable condition: This product applies to: ambient temperature: -25 ℃ ~ 65 ℃, maximum relative humidity: 100% Operating voltage range: Voltage range: 230V;, frequency range: 50Hz ± 5% Technical Parameters Rated voltage: 220V AC 230V AC 240V AC Rated Frequency: 50/60Hz Rated Current: 1.5(6)A 2.5(10)A 2.5(20)A 10(60)A 5(20)A 5(30)A 10(40)A 10(50)A