You remove a terminal block from MP-C in order to replace the controller.
De-energize the high-voltage equipment connected to the relay outputs of the controller.
This applies to all MP-C controllers except the MP-C-18B model, which does not have relay outputs.
Disconnect the 24 VAC/DC power supply and other electrically powered equipment that is connected to the controller.
Insert a small screwdriver in the slot between the terminal block and the connector header.
Gently pry the terminal block at an angle away from the connector header.
Remove the terminal block from the connector header.