Abstract: The surge protector includes a device for connecting a transmission line to ground in the event of excess voltage or current, to protect communications equipment. A thermal sensitive element, located proximate the device, provides an independent, permanent path to ground, before the device can heat to a level where it may fail in the open circuit state. The element is a grounded conductive rod of nickel-titanium alloy which has a configuration memory. The rod normally has an arcuate configuration with a portion spaced from the transmission line contact associated with the device. It will assume a straight configuration, connecting the transmission line contact to ground, if the device overheats. Thermal failsafe protection for protective devices associated with ring and tip conductors, respectively, can be provided with a single thermal sensitive element.