The Edco FAS-TEL-DOT is a single pair telephone protector that implements an advanced three-stage hybrid design. This unit addresses over-voltage transients with gas discharge tubes (GDT) and silicon breakover devices. Additionally, sneak and fault currents are mitigated with PTC technology, which consists of solid state resettable fuses. The Edco FAS-TEL-DOT is specifically designed for more rugged applications such as traffic cabinets.