Phoenix Contact, PT 5-HF-12 DC-ST Surge Suppressor Unit 14 V dc Maximum Voltage Rating 20kA Maximum Surge Current

RS 422 and RS 485 series DATA-PLUGTRAB® data link protection

DATA-PLUGTRAB is a two-part protection module (plug and base) for industrial bus systems and data signal networks that use a 3- or 4-core technique.
The bases' metal grounding foot on the PT 2x2 BE ensures a quick mount on the rail and, consequently, with the nearby ground potential.
Its compact design is only 17.5 mm wide, and it fits onto a symmetric rail.
Pluggable design allows communication to be immediately re-established after unplugging a device that has reached the end of its service life.