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. 504-206
BrandRS PRO
€173.03
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. 738-7871
Mfr. Part No.AT3 15-20/21-4
BrandBlock
€834.17
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. 158-7328
Mfr. Part No.EJET500
BrandBlock
€290.87
Each
units
230V ac 110 V ac 500VA Enclosed - - Cable 180mm 180 x 126 x 192mm 126mm 192mm 50Hz 60Hz -
RS Stock No. 738-7799
Mfr. Part No.AT3 2-24/35-4
BrandBlock
€237.48
Each
units
240 V ac, 346 V ac 400 V ac 2kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 90/41,5 Screw 220mm 220 x 115 x 175mm 115mm 175mm 50Hz 60Hz -
RS Stock No. 504-189
BrandRS PRO
€67.24
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 150VA Enclosed Chassis Mount, Floor Standing, Wall Mount - - 73mm 73 x 120 x 89mm 120mm 89mm 50Hz 60Hz -
RS Stock No. 738-7824
Mfr. Part No.AT3 3,5-24/35-4
BrandBlock
€194.42
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. 738-7802
Mfr. Part No.AT3 2-44/46-4
BrandBlock
€141.31
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. 738-7856
Mfr. Part No.AT3 10-44/46-4
BrandBlock
€289.77
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. 738-7884
Mfr. Part No.AT3 15-48/50-4
BrandBlock
€424.91
Each
units
480 V ac, 500 V ac 400 V ac 15kVA 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. 504-183
BrandRS PRO
€70.36
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 100VA Enclosed Chassis Mount, Floor Standing, Wall Mount - - 65mm 65 x 115 x 78mm 115mm 78mm 50Hz 60Hz -
RS Stock No. 738-7874
Mfr. Part No.AT3 15-22/23-4
BrandBlock
€771.18
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. 738-7859
Mfr. Part No.AT3 10-24/35-4
BrandBlock
€352.43
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. 738-7903
Mfr. Part No.AT3 25-24/35-4
BrandBlock
€856.86
Each
units
240 V ac, 346 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 210/73 Screw 480mm 480 x 180 x 430mm 180mm 430mm 50Hz 60Hz -
RS Stock No. 738-7916
Mfr. Part No.AT3 25-44/46-4
BrandBlock
€443.10
Each
units
440 V ac, 460 V ac 400 V ac 25kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 132/72 Screw 315mm 315 x 185 x 255mm 185mm 255mm 50Hz 60Hz -
RS Stock No. 738-7795
Mfr. Part No.AT3 2-22/23-4
BrandBlock
€230.50
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
€306.58
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. 738-7900
Mfr. Part No.AT3 25-22/23-4
BrandBlock
€1,284.19
Each
units
220 V ac, 230 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. 738-7812
Mfr. Part No.AT3 3,5-20/21-4
BrandBlock
€229.33
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. 738-7806
Mfr. Part No.AT3 2-48/50-4
BrandBlock
€167.38
Each
units
480 V ac, 500 V ac 400 V ac 2kVA 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. 738-7865
Mfr. Part No.AT3 10-48/50-4
BrandBlock
€248.17
Each
units
480 V ac, 500 V ac 400 V ac 10kVA Open Frame Chassis Mount, Floor Standing, Wall Mount 3 UI 114/64 Screw 267mm 267 x 150 x 220mm 150mm 220mm 50Hz 60Hz -