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Answer of the Question
Below mentioned points are deeply Explained in video
Dual Core Transformer
In a dual core current transformer, both the primary and secondary
terminals are important for its operation. Both sets of secondary terminals,
1S1 and 1S2 as well as 2S1 and 2S2, are typically connected to relays or other monitoring devices.
Leaving any of the secondary terminals open circuit could lead to current transformer damage.
Dual Ratio Transormer
In a dual ratio current transformer, If S1 and S2 are relay-connected,
the S3 terminal is typically not used or connected to anything.
if S3 Terminal open nothing will happen to current transformer