Datasheet

16
a) Main Circuit
b) Auxiliary circuit for momentary-contact control
K1 : Sizes 3 to 6,
3TF46 to 3TF51
K1 : Sizes 8 to 12
3TF52 to 3TF56
K2 : 3TF30 10 OB.. for 3TF52-55
3TF32 00-OB.. for 3TF56
K1 : Size 12
3TF57
K2 : 3TC44 17 4A..
The control circuits indicated by dotted lines are to be wired by customer.
S0 = ‘OFF’ Push button
S1 = ‘ON’ Push button
K1 = Star contactor
K2 = Transformer contactor
K3 = Main contactor
K5 = Contactor relay
(2NO + 2NC)
K4 = Time relay (7PU6020)
F1 = Main circuit fuses
F2 = Overload relay
F3 = Control circuit fuse
Auto Transformer starter
Internal connection diagram for DC coil circuits
Please refer page no. 70 for selection of switchgear for autotransformer starting method