Step-downTransformer transformer with more turns wire its primary coil than in
its secondary coil. NEMA
specifies sizes from size size 9.
00 2
0 5
1 10
2 25
3 50
4 135 100
5 270 100 200
6 540 200 400
7 810 300 600
8 1215 450 900
9 2250 800 1600
NEMA
Size
Continuous
Amp Rating
HP
@ 230 VAC
HP
@ 460 VAC
Stator The stationary elements the magnetic circuit rotating
machine such motor.
NEMA and IEC rate motor starters differently. IEC-rated devices
are rated according maximum operational current.
2:1
240 VAC
I amps
Primary Coil
1800 Turns
Secondary Coil
900 Turns
Vload
= 120 VAC
Iload
= amps
Load
Primary Turns
Secondary Turns
Primary Voltage
Secondary Voltage Primary Current
Secondary Current
=.35
Starter Ratings Motor Starters are rated according size and type load.The step-down transformer used step
down the primary voltage lower secondary voltage
