Lightning protector shields differential, balanced digital or analog lines

L-COM HGLND-D2-12 high performance 3-stage lightning protector provides protection of differential or balanced digital or analog lines from transients and surges. DIN mountable 3-stage device protects RS232 and industrial control lines. The first stage is comprised of a differential gas discharge tube. Stage two consists of a pair of current limiting series resistors and the final stage includes a low capacitance diode array.

http://www.l-com.com