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What are the main components for Automatic transfer switch 1 out of 2 using ACB NW or NT ?

the main components for Automatic transfer switch 1 out of 2 using ACB NW or NT  are:

1- Two Motorized ACB (Supplied with MCH motor operated)

2- two under voltage release coils (MN)

3- four Change over Aux. Contacts (OF)

4- two Fault indication trip contacts (SDE)

5- Mechanical interlock for the 2 breakers using: cables or rods
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