Over voltage and over-current power line protectors, protectors assemblies, and structural parts thereof; wireless and wireline co-axial over-voltage protectors, protector assemblies, and structural parts thereof; data line over-voltage protectors, protector assemblies and structural parts thereof; telephone line over-voltage protectors, protector assemblies, and structural parts thereof; over-voltage gas tube protectors and related apparatus, namely, surge arrester tubes, station protectors, protector assemblies, surge protectors, and gas tube arresters; electronic communications testing units to test telephone loops, telephone trunks, pair gain systems, pair gain loops, data circuits, cellular radio circuits, satellite circuits, and analog and digital transmission facilities; modular components for telecommunications systems, namely, splice trays, splice shelves, patch panels and splice closures for mounting, routing and storing fiber optics cables; time release remote loop disconnect for use in remotely disconnecting communication and electronic instruments; latching remote loop disconnect with automatic reset for use in remotely disconnecting communication and electronic instruments; unit for providing continuous balanced or momentary ground resistance and isolating ringers from ground during active mode of communication