Main Function:The BD-Ais applicable to the AC 220V/50Hz power supply system,which can automatically detect the current value and display it in real time.When the line is overflowed (>setting value), the load power can be disconnected by device again .when the currents restored to normal value, the load power can be connected by device again. 1.Used to limit and control the use of electricity to achieve energy saving, protection circuit.2.35mm rail mounting method, easier to install.3.If load currents over the setting value +0.4A,the OVERLOAD indicator flash 20sec time,then the device cut off power for load.the screen shows ERR .Introduction to functions:1.When power on,display 888on the boot ,INindicator bright and GUARANTEEindicator bright.At the end of 5sec,enter the set currents interface. IN indicator flash,then you can set the currents protect threshold within 10sec.If you don't set ,it default 10A.If it's already set once,the currents protect threshold is what you set last time .Then the device will into normal working interface. The device will display the currents value in real time.2.If you need to set the currents protect threshold value ,you can pre button for a short time to increase or decrease the value by 0.2A ,and pre button for long time the value increase or decrease the value by 1A .3.The overcurrent setting value 2A~32A, and factory default is 10A.4.If load currents over the setting value +0.4A,the OVERLOAD indicator flash 20sec time,then the device cut off power for load.the screen shows ERR . affter about 10sec time ,the device will start the same proce with the article 1 of operation .5.The guarantee of this product is 180 days,when over 180days the guarantee indicator will off. the guarantee grand total time only when you use it .DETAIL:1.If you need to set the currents protect threshold value ,you can pre button for a short time to increase or decrease the value by 0.2A ,and pre button for long time the value increase or decrease the value by 1A .2. If load currents over the setting value +0.4A,the OVERLOAD indicator flash 20sec time,then the device cut off power for load.the screen shows ERR . affter about 10sec time ,the device will start the same proce with the article 1 of operation .3.The guarantee of this product is 180 days,when over 180days the guarantee indicator will off.