Surge protection for two SHDSL telecommunication interfaces. Design: RJ45 (RJ12/RJ11) adapter plug with pluggable screw terminal (COMBICON) and separately routed earth connection cable. Alternatively usable as a DIN rail module for snapping onto NS 35, with ground connection snap-in foot. Protection circuit: Coarse/fine protection combination between all lines of the signal wire pairs, as well as longitudinal voltage coarse protection between all signal wires and earth.