This is a Plug-in switch, which can be placed between a wall outlet for British Standards plug and electric devices with a resistive load up to 3000W, plugged in by cord. In addition, this intelligent plug-in switch is able to detect the voltage, the power factor, the current amd measure the electric power taken by this load (in Wh) as well as meter the electrical energy consumed (in kWh). It will also detect a possible overload (3010 ~ 3300W) of the connected electrical device. When detecting an overload, the module is deactivated and the LED will flash for 30 seconds. In case the devices is used for metering only a special configuration option prevents the device from turning off the load.