Emerson Edco FAS-TEL-DOT is a telephone protector designed for rugged applications like traffic cabinets. It employs a three-stage hybrid design with gas discharge tubes, silicon breakover devices, and PTC technology to safeguard against over-voltage transients, sneak currents, and fault currents. With a clamping voltage of 270 VDC, it can handle peak surge currents up to 10kA. Installation should be done by qualified electricians, and the device should not be used on signal lines capable of supplying more than 5 Amps continuously.