The term 'KIND OF PROTECTOR' can be summarized by the crossword solution SURGE, which is a five-letter word. A SURGE protector is an electrical device that is designed to protect electrical devices from voltage spikes. It works by limiting the voltage supplied to an electric device by either blocking or shorting to ground any unwanted voltages above a safe threshold. SURGE protectors are commonly used in homes and businesses to protect electronic equipment from power surges and spikes.