The antonyms for "switches off" could be "turns on", "activates", "energizes", or "starts up." These terms refer to the opposite action of "switching off," which means to turn off or shut down a device or appliance. "Turns on" suggests that a device has been activated or powered up, while "activates" emphasizes the idea of starting or enabling a machine or system to work. "Energizes" refers to the boosting of energy levels or electrical signals, and "starts up" implies the beginning of a process or operation. Thus, whether you want to describe the act of turning off or on an appliance or machine, there are plenty of antonyms available to convey your message.