Overview
The REL52439 is a Schneider Sepam series 20 protection relay in the Easergy range, wired for 3 CT + I0 input and powered from a 12 V DC supply. It ships in a PCE package with Russian-language firmware and two RJ45 ports for network connectivity.
Selection and comparison
Compared to the REL52437, which runs on a 155.0 V supply, the REL52439 operates on 12.0 V — pick the REL52437 when the control voltage is 155.0 V rather than 12.0 V. Against the REL52438, which uses an RS485 interface, the REL52439 provides 2 RJ45 ports; choose the REL52438 when the network requires RS485 instead of Ethernet.
Schneider lists the REL52439 as active production; it is a current catalog item with standard lead times. An RFQ confirms availability and pricing for the exact build code.