Abstract: A power cut-off system for cutting a 220V power supply, or any other voltage value, of an electrical device, such as an oven for example, while maintaining a 110V power supply, or any other voltage value, to the electrical device, the system comprising a control-board unit connected to the 220V power supply of the electrical device and providing 110V and 220V respectively to the electrical device, the control-board unit including a transponder for sending and receiving wireless signals. The system also includes a smoke detector unit for detecting smoke and sending a wireless signal to the transponder of the control-board unit to cut-off the 220V power supply of the electrical device while maintaining the 110V power supply to the electrical device.