Plug-in data line protection type 1+2/D1+C2 for use in measurement, control and regulation technology. Protection device for multi-core systems. Indirect shield grounding. Frequency range up to 100 MHz. Grounding via the top hat rail or connecting cable possible. Small width of 12.5 mm. High system availability - no signal interruption without protection module With optical signaling and the option of remote signaling via the PDP-PS power supply. Application: Universal lightning and surge protection for data transmission devices in MSR technology.