Overview
The REL52437 is an active Sepam series 20 protection relay from Schneider, wired for 3 CT + I0 input and powered at 155 V DC. It ships in a PCE package with Russian-language firmware and dual RJ45 ports for Ethernet-based communication.
Selection vs siblings
The 155 V supply rail sets it apart from the REL52439, which runs on 12 V — pick the REL52439 for low-voltage DC panels. If your network uses RS485 rather than Ethernet, the REL52436 swaps the 2 RJ45 ports for a single RS485 interface.