Protection for Catenaries: PDZIN1
The catenary feeder protection relay PDZIN1 protects power supplies for railway catenaries (single 25kV / twin 25kV) at 50 or 60Hz. 
The PDZIN1 also features functions that help network operation: fault locator (similar to LDN1 relay), disturbance recording and desensitisation to de-icing currents. 
An optional recloser with 3 cycles is available. 
As well as the usual protective functions, the PDZIN1 relay provides monitoring, measurement and recording of the electrical quantities.

Do you need a catenary protection relay with Modbus TCP (ethernet) communication?  Consider the PDZI800.

ANSI functions: 
21 / 27 / 32RP / 50 / 50BF / 51 / 87 / 79 / 21FL / 50FL / 87FL

This relay allows communication via Modbus RTU (RS485).  A full brochure is available  on the Railway Industry page.