Specifications

105
Starter Ratings Motor Starters are rated according to size and type of load.
NEMA and IEC rate motor starters differently. IEC-rated devices
are rated according to maximum operational current. NEMA
specifies sizes from size 00 to size 9.
00 9 1 2
0 18 3 5
1 27 7 10
2 45 15 25
3 90 30 50
4 135 50 100
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 of the magnetic circuit of a rotating
machine such as a motor.
Step-down Transformer A transformer with more turns of wire in its primary coil than
in its secondary coil. The step-down transformer is used to step
down the primary voltage to a lower secondary voltage.
2:1
240 VAC
I = 5 amps
Primary Coil
1800 Turns
Secondary Coil
900 Turns
V
load
= 120 VAC
I
load
= 10 amps
Load
Primary Turns
Secondary Turns
Primary Voltage
Secondary Voltage Primary Current
Secondary Current
= =