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
kr 475,07
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. 738-7824
Mfr. Part No.AT3 3,5-24/35-4
BrandBlock
kr 2 229,99
Each
Units
240 V ac, 346 V ac 400 V ac 3.5kVA 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. 436-9842
Mfr. Part No.AIM10/5
BrandBlock
kr 2 071,37
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. 738-7922
Mfr. Part No.AT3 25-69-4
BrandBlock
kr 7 293,47
Each
Units
690V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 210/73 Screw 480mm 480 x 192 x 395mm 192mm 395mm 50Hz 60Hz -
RS Stock No. 738-7874
Mfr. Part No.AT3 15-22/23-4
BrandBlock
kr 4 958,99
Each
Units
220 V ac, 230 V ac 400 V ac 15kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 180/78 Screw 410mm 410 x 195 x 345mm 195mm 345mm 50Hz 60Hz -
RS Stock No. 310-1140
Mfr. Part No.SAT100
BrandBlock
kr 486,34
Each
Units
230V ac 115 V ac 100VA - - - - 166mm 166 x 76 x 77mm 76mm 77mm - - -
RS Stock No. 738-7859
Mfr. Part No.AT3 10-24/35-4
BrandBlock
kr 4 958,08
Each
Units
240 V ac, 346 V ac 400 V ac 10kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 150/65 Screw 350mm 350 x 162 x 280mm 162mm 280mm 50Hz 60Hz -
RS Stock No. 293-2662
Mfr. Part No.AIM 3.2/1.6
BrandBlock
kr 718,64
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. 738-7795
Mfr. Part No.AT3 2-22/23-4
BrandBlock
kr 2 640,45
Each
Units
220 V ac, 230 V ac 400 V ac 2kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 90/51,5 Screw 220mm 220 x 125 x 175mm 125mm 175mm 50Hz 60Hz -
RS Stock No. 738-7821
Mfr. Part No.AT3 3,5-22/23-4
BrandBlock
kr 3 516,42
Each
Units
220 V ac, 230 V ac 400 V ac 3.5kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 114/64 Screw 267mm 267 x 150 x 220mm 150mm 220mm 50Hz 60Hz -
RS Stock No. 504-206
BrandRS PRO
kr 1 831,49
Each
Units
220 V ac, 230 V ac, 240 V ac 115V ac 1kVA Enclosed Chassis Mount, Floor Standing, Wall Mount - - 115mm 115 x 192 x 137mm 192mm 137mm 50Hz 60Hz -
RS Stock No. 310-1156
Mfr. Part No.SAT200
BrandBlock
kr 490,13
Each
Units
230V ac 115 V ac 200VA - - - - 166mm 166 x 76 x 77mm 76mm 77mm - - -
RS Stock No. 738-7812
Mfr. Part No.AT3 3,5-20/21-4
BrandBlock
kr 2 487,52
Each
Units
200 V ac, 208 V ac 400 V ac 3.5kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 114/64 Screw 267mm 267 x 150 x 220mm 150mm 220mm 50Hz 60Hz -
RS Stock No. 738-7846
Mfr. Part No.AT3 10-20/21-4
BrandBlock
kr 7 400,43
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. 504-202
BrandRS PRO
kr 544,26
Each
Units
230V ac 115V ac 50VA Enclosed Chassis Mount, Floor Standing, Wall Mount - - 58mm 58 x 63 x 70mm 63mm 70mm 50Hz 60Hz -
RS Stock No. 738-7907
Mfr. Part No.AT3 25-38/42-4
BrandBlock
kr 2 762,69
Each
Units
380 V ac, 415 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 114/40 Screw 267mm 267 x 145 x 220mm 145mm 220mm 50Hz 60Hz -
RS Stock No. 738-7880
Mfr. Part No.AT3 15-44/46-4
BrandBlock
kr 2 831,18
Each
Units
440 V ac, 460 V ac 400 V ac 15kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 114/64 Screw 267mm 267 x 150 x 215mm 150mm 215mm 50Hz 60Hz -
RS Stock No. 738-7919
Mfr. Part No.AT3 25-48/50-4
BrandBlock
kr 6 659,26
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. 738-7802
Mfr. Part No.AT3 2-44/46-4
BrandBlock
kr 1 620,72
Each
Units
440 V ac, 460 V ac 400 V ac 2kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 75/26,5 Screw 155mm 155 x 95 x 155mm 95mm 155mm 50Hz 60Hz -
RS Stock No. 738-7843
Mfr. Part No.AT3 3,5-69-4
BrandBlock
kr 3 191,70
Each
Units
690V ac 400 V ac 3.5kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 114/40 Screw 267mm 267 x 125 x 215mm 125mm 215mm 50Hz 60Hz -
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