Magnum is one of the best manufacturers of Star Delta Starter which is Semi & Fully automatic 3 Phase

1. Star Delta Starters-
Magnumswitchgear

2. Star Delta Starters
Introduction to Star Delta Motor Starter
Normaly Induction Motors are started with Direct On Line, when large
motors started with Direct On Line, they Cause voltage disturbance in the
supply kines due to large current suge.
To avoid this large starting current in the supply lines , motors are
strated with the reduced voltage and then have full supply voltage
reconnected to the motors .

3. Star Delta Starters
Star Delta Starter Consists of Following units
1. Contactors (Main, star and delta contactors) 3 No’s
(For Open State Starter) or 4 No’s (Close Transient
Starter).
2. Time relay (pull-in delayed) 1 No.
3. Three-pole thermal over current release 1 No.
4. Fuse elements or automatic cut-outs for the main
circuit 3 Nos.
5. Fuse element or automatic cut-out for the control
circuit 1No.

4. Features of star-delta
starting
1. For low- to high-power three-phase
motors.
2. Reduced starting current
3. Six connection cables
4. Reduced starting torque
5. Current peak on changeover from star to
delta
6. Mechanical load on changeover from star
to delta

5. Application of Star-Delta
Starter
1. The star-delta method is usually only applied to low to
medium voltage and light starting Torque motors.
2. The received starting current is about 30 % of the starting
current during direct on line start and the starting torque is
reduced to about 25 % of the torque available at a D.O.L
start. This starting method only works when the application
is light loaded during the start.
3. If the motor is too heavily loaded, there will not be enough
torque to accelerate the motor up to speed before switching
over to the delta position.

6. Star Delta Starters

7. About us
Magnumswitchgear
offers you low
voltage switchgear.
We focus on
providing you Motor
Control Panels and
starters for domestic
and agricultural use.
The product range is
focused on
Contact us
MagnumSwitchgear,
Magadi Road,Bengaluru -
560079, Karnataka, India
+91-8618241212, +91-
80-23580952
sales@magnumswitchg
ear.com
Our main Products
Is the color of blood,
and because of this
it has historically
been associated
with sacrifice,
danger and courage.
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ar_delta_starters/