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. 738-7868
Mfr. Part No.AT3 10-58/60-4
BrandBlock
€437.83
Each
units
575 V ac, 600 V ac 400 V ac 10kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 132/72 Screw 315mm 315 x 165 x 250mm 165mm 250mm 50Hz 60Hz -
RS Stock No. 738-7890
Mfr. Part No.AT3 25-20/21-4
BrandBlock
€995.01
Each
units
200 V ac, 208 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 210/88 Screw 480mm 480 x 220 x 440mm 220mm 440mm 50Hz 60Hz -
RS Stock No. 738-7878
Mfr. Part No.AT3 15-24/35-4
BrandBlock
€449.30
Each
units
240 V ac, 346 V ac 400 V ac 15kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 180/63 Screw 410mm 410 x 175 x 345mm 175mm 345mm 50Hz 60Hz -
RS Stock No. 436-8861
Mfr. Part No.CMA10K/FM0
€452.02
Each
units
380 V, 400 V, 415 V 380 V, 400 V, 415 V 10kVA Enclosed Floor Standing - - 420mm 420 x 270 x 325mm 270mm 325mm 50Hz 60Hz -
RS Stock No. 738-7896
Mfr. Part No.AT3 15-69-4
BrandBlock
€651.73
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 -
RS Stock No. 738-7907
Mfr. Part No.AT3 25-38/42-4
BrandBlock
€240.86
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. 347-6652
Mfr. Part No.CM1000/A/US
€114.97
Each
units
230V ac 114.2V ac 1kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -
RS Stock No. 738-7919
Mfr. Part No.AT3 25-48/50-4
BrandBlock
€580.58
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. 738-7846
Mfr. Part No.AT3 10-20/21-4
BrandBlock
€645.21
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. 738-7880
Mfr. Part No.AT3 15-44/46-4
BrandBlock
€312.88
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. 436-8877
Mfr. Part No.CMA30K/FM0
€653.63
Each
units
380 V, 400 V, 415 V 380 V, 400 V, 415 V 30kVA - - Bobbin - 420mm 420 x 350 x 260mm 350mm 260mm - - -
RS Stock No. 738-7843
Mfr. Part No.AT3 3,5-69-4
BrandBlock
€285.99
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 -
RS Stock No. 738-7830
Mfr. Part No.AT3 3,5-48/50-4
BrandBlock
€202.13
Each
units
480 V ac, 500 V ac 400 V ac 3.5kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 90/41,5 Screw 220mm 220 x 115 x 175mm 115mm 175mm 50Hz 60Hz -