Three-phase Starting Autotransformers EA3R

Starting autotransformers are used primarily in high power drive systems where the switching of the star connection in the triangle connection of stator windings is technically difficult and does not provide tangible results. In the case of start-up transformers the voltage can be arbitrarily lowered at the time of starting the motor, so that the current drawn from the network does not exceed the set value. If necessary, we can produce starting autotransformers with many tappings.

Product for:


Design Three-phase starting autotransformers EA3R are produced in accordance with requirement of standard:
EN/IEC 60726
Insulation class

F(155oC) - standard

Climatic class/Environmental class

C1/E0 - land design; C2/E1 - maritime design

Ambient temperature 40oC
Protection degree IP 23
Protection class I
Frequency 50/60 Hz
Primary voltage up to 1000 V
Secondary voltage up to 1000 V
Fastening by means of angles


Technical sketch

Standard design Standard design
Standard design


Dimension table

Technical data of three-phase starting autotransformers type EA3R

Type of autotransformer Core power factor / Outgoing powerc przechodnia
Sample data L
EA3R 0,55/1,5 3x240V(50Hz)/3x380V Yan0 200 220 220 160 180 9 x 13 11
EA3R 25/77 3x440V(60Hz)/3x290V III 660 650 710 430 600 13 x 18 205
EA3R 60/350 3x440V(60Hz)/3x215V III 720 650 785 490 600 13 x 18 315
EA3R 61/370 3x380V(60Hz)/3x270-230V III 870 705 845 590 655 13 x 18 430
EA3R 90/480 3x380V/3x200V II 870 705 845 590 655 13 x 18 450


Producent zastrzega sobie prawo wprowadzania zmian wynikających z ciągłego rozwoju oferowanych wyrobów.

Możliwe jest wykonanie transformatora w innej wersji i o innej mocy niż podano w tabeli po wcześniejszym uzgodnieniu.

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