The IS200EXTBG4A model is the fourth and final model of the EXTB series. This specific EXTB model is a complex control and is used in breaker mode, this model is also the second of the four models that can be used with a 41T trip relay. The primary function of this model is to handle all of the protection functions as well as field flashing functions. In relation to the power supply of the model, it will be sent from the M1 or M2 controllers, typically this supply is redundant, and after it has been received it will proceed to be sent to the connected EMIO board which is located in the control rack.
The IS200EXTBG4A model is the final input/output exciter terminal board out of the IS200EXTB models, typically these models are used with the EDEX model to help with the firing of de-excitation. This model is also used to control field breakers within field circuits.
The IS200EXTBG4A is not widely available on the market but AX Control Inc, which is located in Raleigh, North Carolina can do its best to not only help find this model for you but can also help repair the model for you if needed as well.