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

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Description Price Primary Voltage Rating Secondary Voltage Rating Power Rating Construction Mounting Type Core Type Termination Type Length Dimensions Width Depth Minimum Operating Frequency Maximum Operating Frequency Minimum Temperature
RS Stock No. 293-2656
Mfr. Part No.AIM 1.6/0.8
BrandBlock
£41.77
Each
Units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Enclosed Panel Mount - Screw 166mm 166 x 77 x 76mm 77mm 76mm 50Hz 60Hz -20°C
RS Stock No. 310-1156
Mfr. Part No.SAT200
BrandBlock
£60.31
Each
Units
230V ac 115 V ac 200VA - - - - 166mm 166 x 76 x 77mm 76mm 77mm - - -
RS Stock No. 310-1162
Mfr. Part No.SAT300
BrandBlock
£81.07
Each
Units
230V ac 115 V ac 300VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
RS Stock No. 310-1140
Mfr. Part No.SAT100
BrandBlock
£59.69
Each
Units
230V ac 115 V ac 100VA - - - - 166mm 166 x 76 x 77mm 76mm 77mm - - -
RS Stock No. 328-8051
Mfr. Part No.SAT 500
BrandBlock
£85.06
Each
Units
230V ac 115 V ac 500VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
RS Stock No. 293-2678
Mfr. Part No.AIM 5.0/2.5
BrandBlock
£71.08
Each
Units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac - Enclosed Panel Mount - Screw 223mm 223 x 97 x 117mm 97mm 117mm 50Hz 60Hz -20°C
RS Stock No. 436-9858
Mfr. Part No.AIM16/8
BrandBlock
£207.76
Each
Units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Enclosed Panel Mount - Screw 284mm 283 x 200 x 165mm 165mm 200mm 50Hz 60Hz -20°C
RS Stock No. 436-9842
Mfr. Part No.AIM10/5
BrandBlock
£165.62
Each
Units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Enclosed Panel Mount - Screw 283mm 283 x 200 x 165mm 165mm 200mm 50Hz 60Hz -20°C
RS Stock No. 293-2662
Mfr. Part No.AIM 3.2/1.6
BrandBlock
£58.27
Each
Units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Enclosed Panel Mount - Screw 223mm 223 x 97 x 117mm 97mm 117mm 50Hz 60Hz -20°C
RS Stock No. 328-8067
Mfr. Part No.SAT 600
BrandBlock
£84.55
Each
Units
230V ac 115 V ac 600VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
RS Stock No. 738-7871
Mfr. Part No.AT3 15-20/21-4
BrandBlock
£719.11
Each
Units
200 V ac, 208 V ac 400 V ac 15kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 180/78 Screw 410mm 410 x 170 x 380mm 170mm 380mm 50Hz 60Hz -
RS Stock No. 738-7837
Mfr. Part No.AT3 3,5-44/46-4
BrandBlock
£132.93
Each
Units
460 V ac, 3 x 440 V ac 400V ac 3.5 kVA, 10 kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 75/41,5 Screw 155mm 155 x 110 x 155mm 110mm 155mm 50Hz 60Hz -
RS Stock No. 738-7919
Mfr. Part No.AT3 25-48/50-4
BrandBlock
£494.29
Each
Units
480 V ac, 500 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 150/77 Screw 350mm 350 x 192 x 280mm 192mm 280mm 50Hz 60Hz -
RS Stock No. 158-7340
Mfr. Part No.EJET1000
BrandBlock
£361.90
Each
Units
230V ac 110 V ac 1000VA Enclosed Floor Standing - Cable 244mm 244 x 143 x 197mm 143mm 197mm 50Hz 60Hz -
RS Stock No. 738-7852
Mfr. Part No.AT3 10-38/42-4
BrandBlock
£145.52
Each
Units
380 V ac, 415 V ac 400 V ac 10kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 90/31,5 Screw 220mm 220 x 105 x 175mm 105mm 175mm 50Hz 60Hz -
RS Stock No. 158-7312
Mfr. Part No.E-JET 250
BrandBlock
£207.49
Each
Units
230V ac 110 V ac 250VA Enclosed - - 3-Pin USA Socket, Cable with Plug 160mm 160 x 95 x 155mm 95mm 155mm 50Hz 60Hz -
RS Stock No. 738-7846
Mfr. Part No.AT3 10-20/21-4
BrandBlock
£549.31
Each
Units
200 V ac, 208 V ac 400 V ac 10kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 150/77 Screw 350mm 350 x 192 x 280mm 192mm 280mm 50Hz 60Hz -
RS Stock No. 738-7840
Mfr. Part No.AT3 10-22/23-4
BrandBlock
£464.84
Each
Units
230V ac 400 V ac 10000VA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 150/77 Screw 350mm 350 x 192 x 280mm 192mm 280mm 50Hz 60Hz -
RS Stock No. 738-7856
Mfr. Part No.AT3 10-44/46-4
BrandBlock
£232.89
Each
Units
440 V ac, 460 V ac 400 V ac 10kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 114/40 Screw 267mm 267 x 125 x 215mm 125mm 215mm 50Hz 60Hz -
RS Stock No. 738-7896
Mfr. Part No.AT3 15-69-4
BrandBlock
£627.54
Each
Units
220 V ac, 230 V ac 400 V ac 15kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 180/63 Screw 410mm 410 x 155 x 340mm 155mm 340mm 50Hz 60Hz -