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Autotransformers

An autotransformer, also known as a step-down transformer, is an electrical transformer with only one winding. The winding has at least 3 taps where electrical connections are made. Autotransformers have the benefit of being small, light and cheap compared to dual-winding transformers.

Autotransformers are used to step up or step down voltages in the 110V-115V-120V range and 220V-230V-240V range. This allows electrical equipment from the US to be fed from higher European voltage.

Applications

• Can be used as a method of soft starting induction motors

• In UK railway applications

• In audio applications, tapped autotransformers are used to adapt speakers to constant-voltage distribution systems

• Power applications to interconnect systems operating at different voltages

• Special autotransformers are used on rural power distribution lines so that customers further away receive the same average voltage as ones nearer to the source

45 Products showing for Autotransformers

Temporarily out of stock
Block Open Frame 25 kVA Auto-Transformer, 460 V ac, 440 V Primary, 400 V ac Secondary
  • RS Stock No. 738-7916
  • Mfr. Part No. AT3 25-44/46-4
Subtotal (1 unit)
£671.38(exc. VAT)
£671.38/unit
Temporarily out of stock
Block Open Frame 10 kVA Auto-Transformer, 600 V ac, 575 V Primary, 400 V ac Secondary
  • RS Stock No. 738-7868
  • Mfr. Part No. AT3 10-58/60-4
Subtotal (1 unit)
£644.83(exc. VAT)
£644.83/unit
Temporarily out of stock
Block Open Type 1000 VA Auto-Transformer, 380 V, 415 V Primary, 3 x 400 V Secondary
  • RS Stock No. 738-7852
  • Mfr. Part No. AT3 10-38/42-4
Subtotal (1 unit)
£229.11(exc. VAT)
£229.11/unit
In Stock
Block Open Frame 25 kVA Auto-Transformer, 500 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7919
  • Mfr. Part No. AT3 25-48/50-4
Subtotal (1 unit)
£901.49(exc. VAT)
£901.49/unit
Temporarily out of stock
Block Open Frame 3.5 kVA Auto-Transformer, 500 V ac, 480 V Primary, 400 V ac Secondary
  • RS Stock No. 738-7830
  • Mfr. Part No. AT3 3,5-48/50-4
Subtotal (1 unit)
£275.11(exc. VAT)
£275.11/unit
In Stock
Block Enclosed Auto-Transformer, 230 V ac Primary
  • RS Stock No. 436-9842
  • Mfr. Part No. AIM10/5
Subtotal (1 unit)
£432.15(exc. VAT)
£432.15/unit
Temporarily out of stock
Block Open Frame 15 kVA Auto-Transformer, 200 V, 208 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7871
  • Mfr. Part No. AT3 15-20/21-4
Subtotal (1 unit)
£1,254.32(exc. VAT)
£1,254.32/unit
In Stock
Block Open Frame 10 kVA Auto-Transformer, 440 V, 460 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7856
  • Mfr. Part No. AT3 10-44/46-4
Subtotal (1 unit)
£377.57(exc. VAT)
£377.57/unit
In Stock
Block Enclosed 1000 VA Auto-Transformer, 230 V ac Primary, 110 V ac Secondary
  • RS Stock No. 158-7340
  • Mfr. Part No. E-JET 1000
Subtotal (1 unit)
£833.68(exc. VAT)
£833.68/unit
Temporarily out of stock
Block Open Frame 10 kVA Auto-Transformer, 3 x 440 V ac, 460 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7837
  • Mfr. Part No. AT3 3,5-44/46-4
Subtotal (1 unit)
£217.87(exc. VAT)
£217.87/unit
Stocked by manufacturer
Siemens 400 VA Auto-Transformer, 230 V ac Primary, 230 V ac Secondary
  • RS Stock No. 143-934
  • Mfr. Part No. 3KC9624-1
Subtotal (1 unit)
£528.56(exc. VAT)
£528.56/unit
In Stock
Block Open Frame 15 kVA Auto-Transformer, 460 V ac, 440 V Primary, 400 V ac Secondary
  • RS Stock No. 738-7880
  • Mfr. Part No. AT3 15-44/46-4
Subtotal (1 unit)
£450.89(exc. VAT)
£450.89/unit
Temporarily out of stock
Block Open Frame 25 kVA Auto-Transformer, 220 V, 230 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7900
  • Mfr. Part No. AT3 25-22/23-4
Subtotal (1 unit)
£1,988.70(exc. VAT)
£1,988.70/unit
Temporarily out of stock
Block Open Frame 15 kVA Auto-Transformer, 220 V, 230 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7874
  • Mfr. Part No. AT3 15-22/23-4
Subtotal (1 unit)
£1,166.81(exc. VAT)
£1,166.81/unit
In Stock
Block Open Frame 3.5 kVA Auto-Transformer, 208 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7812
  • Mfr. Part No. AT3 3,5-20/21-4
Subtotal (1 unit)
£428.06(exc. VAT)
£428.06/unit
In Stock
Block Open Frame 2 kVA Auto-Transformer, 690 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7818
  • Mfr. Part No. AT3 2-69-4
Subtotal (1 unit)
£296.28(exc. VAT)
£296.28/unit
In Stock
Block Open Frame 2 kVA Auto-Transformer, 460 V ac, 440 V Primary, 400 V ac Secondary
  • RS Stock No. 738-7802
  • Mfr. Part No. AT3 2-44/46-4
Subtotal (1 unit)
£173.06(exc. VAT)
£173.06/unit
In Stock
Block Open Frame 2 kVA Auto-Transformer, 480 V, 500 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7806
  • Mfr. Part No. AT3 2-48/50-4
Subtotal (1 unit)
£210.38(exc. VAT)
£210.38/unit
In Stock
Block Open Frame 3.5 kVA Auto-Transformer, 230 V ac, 220 V Primary, 400 V ac Secondary
  • RS Stock No. 738-7821
  • Mfr. Part No. AT3 3,5-22/23-4
Subtotal (1 unit)
£445.36(exc. VAT)
£445.36/unit
Temporarily out of stock
Block Open Frame 3.5 kVA Auto-Transformer, 240 V, 346 V ac Primary, 400 V ac Secondary
  • RS Stock No. 738-7824
  • Mfr. Part No. AT3 3,5-24/35-4
Subtotal (1 unit)
£378.21(exc. VAT)
£378.21/unit
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