Overview

The Schneider Electric SEP888 Base Unit is the primary operator and communication interface for Sepam Series 80 protection relays. Designed for substation and industrial power system environments, it features a mimic-based User Machine Interface (UMI) that allows operators to easily visualize system status, acknowledge alarms, and interact with protection and control functions directly from the front panel.

Its wide operating voltage range (24–250 V AC/DC) and rugged construction ensure dependable performance in harsh electrical environments. Additionally, the SEP888 simplifies configuration and diagnostics, reducing commissioning time and improving operational efficiency. Therefore, it is widely used in switchgear panels, utility substations, and critical industrial power systems where fast response and system reliability are essential.

Technical Data

Application

The SEP888 Base Unit is deployed in:

• Medium- and high-voltage switchgear

• Utility substations and transformer bays

• Industrial plant power distribution systems

• Emergency power and backup protection schemes

Its clear mimic display improves situational awareness during abnormal conditions and assists operators during maintenance, fault diagnosis, and protective relay management. The robust design suits both retrofit and new installations requiring long-term operational continuity.

FAQ

Q: Which relays is the SEP888 compatible with?
A: It is designed for use with the Schneider Electric Sepam Series 80 protection relay family.

Q: What type of operator interface is provided?
A: A mimic-based UMI with LED indicators and a 128 × 240 pixel graphical display.

Q: Does it support wide-range power supplies?
A: Yes, it operates from 24–250 V AC or DC.

Q: How can it be mounted?
A: Panel-mount and DIN-rail installation options are supported.

Q: What communication protocols are available?
A: Modbus, Modbus TCP/IP, and Schneider proprietary protocols depending on configuration.