CIRCUTOR OPTIM HYB Series - Manual (Page 21)

Figure 12: Current transformer (CT) connection terminals.
Once the cables are installed, disconnect the jumper connecting the 3 S1 and S2 terminals of
the capacitor bank (see Figure 13 )
Figure 13: 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.
21 Instruction Manual
OPTIM HYB Series