Crompton Controls M20 - Manual (Page 19)

18 Selection of Current Transformer Emotron AB 01-2551-01r4
Fig. 6 Example of a CTM 010 with 2 windings and a primary transformer
500:5 with 1 winding for a 260 A motor.
NOTE: The transformer connection and orientation are not polarity sensi-
tive, but must be connected to the same phase that is being referenced for
terminal 9 of the M20.
L1
L2
L3
1 2
S1 S2
M
3
M20
2 windings
CTM010
P2
500:5
S1 S2
1 winding