IS200EPSMG1A vs IS200EPSMG2A: Key Differences in GE EX2100 Excitation Modules

Time: January 26, 2026

Recently, the demend for IS200EPSMG2A is increasing. As the GE EX21000 power supply module, EPSM module is mounted in the EPBP backplane and provide logic level power to the controller. EPSM module converts 125 V dc from the EPDM into the voltages.


IS200EPSMG1A and IS200EPSMG2A both are Exciter Power Supply Module belong to GE EX2100 series, what's the difference.

1. Core Functions and Application Positioning

Item

IS200EPSMG1A

IS200EPSMG2A

Application

Excitation control system, supply for the thyristor excitation system

Regulator control system, providing stable power to the EX2100 regulator system.

System

The EX2100 excitation control series is used for excitation control circuits in gas, steam, and hydro generators

The EX2100 regulator control series is used for the core control and signal processing circuits of excitation regulators.

Interface

2 main connectors + 1 auxiliary interface

2 main connectors + 2 auxiliary interfaces

Led

3 status lights (POWER/OK/FAULT)

5 status lights (POWER/OK/FAULT/EPSD/REG)


2. Hardware configuration differences
IS200EPSMG2A features a daughter board IS200EPSD at the corner, which is absent in the IS200EPSMG1A. IS200EPSD modifies the power input path, enhances voltage tolerance, and acts as a protective fuse between the DC link and buck regulator, supporting the EX2100 regulator’s signal processing needs.
IS200EPSMG1A is mounted in the EPBP backplane. IS200EPSMG2A, meanwhile, mounts on ERBP (Exciter Regulator Backplane) or ERRB (Redundant Regulator Backplane) for simplex or redundant setups. Due to EPSMG2 includes an IS200EPSD daughter board, additional check of the IS200EPSD connections and status are required during maintance. So that the signal conditioning function can be ensured.

GE IS200EPSMG1A

GE IS200EPSMG2A

In conclusion, the IS200EPSMG1A is designed to robust power for high current excitation circuites, while the IS200EPSMG2A is for precise regulator operation. IS200EPSMG1A and S200EPSMG2A completely different from the physical interfaces to functional logic. They are can't be used as the alternative of each other.

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