CIRCUTOR OPTIM-EMS-C Series - Manual (Page 16)

Figure 9: Current transformer (CT) connection terminals.
Once the cables are installed, disconnect the jumper connecting the S1 and S2 terminals of the
capacitor bank ( Figure 10 )
Figure 10: Jumper for short-circuiting the secondary winding of the current transformer (CT).
Any time you wish to change or disconnect a current transformer that is already
installed, it is important to install the jumper connecting S1 and S2.
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OPTIM EMS-C series
Instruction Manual