Datasheet

67
Construction:
It consists of three contactors (3TW03), bimetal overload relay
(3UW50), electronic timer (3RP) for automatic changeover from
‘star’ to ‘delta’ and push buttons (ON-OFF, Reset) for control
command.
Operation:
To start the motor, ON’ push button is pressed, the line contactor
and the star contactor switch-on connecting motor windings in
star formation on reduced voltage. After the preset time, the
timer automatically switches off the ‘star’ contactor and switches
‘ON’ the ‘delta’ contactor, thus after the starting period, the motor
runs on full voltage. The OFF push button has been provided to
switch off the entire circuit.
B4. Fully automatic star delta starter in open execution
This starter is exactly same as fully automatic starter in sheet steel
housing expect the enclosure and push buttons. The contactor
and birelays are wired and mounted on the plate.
This starter is similar to RAJA DOL starter with sheet steel housing
(3TW42901A). In order to offer flexibility of selecting exact 3UA
relay range by the customer, this starter has only provision for
mounting the bi-relay but the birelay is not provided in the starter.
Customer is required to select the suitable bi-relay and mount it in
the starter before putting it in service.
C2. Star Delta (3TE04):
This starter is similar to star delta starter with sheet steel housing
(3TE02). In order to offer flexibility of selecting exact 3UA relay
range by the customer, this starter has only provision for
mounting the bi-relay but the birelay is not provided in the starter.
Customer is required to select the suitable bi-relay and mount it in
the starter before putting it in service.
C. Industrial Starter:
C1. DOL (3TW04):
B3. Fully automatic Star-Delta Starter (3TE02)
In this starter, the changeover from ‘star’ to ‘delta’ is done
automatically after a preset time by using a timer.