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. 504-195
BrandRS PRO
R 3,023.40
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 500VA Enclosed Chassis Mount, Floor Standing, Wall Mount - - 98mm 98 x 145 x 118mm 145mm 118mm 50Hz 60Hz -
RS stock no. 738-7884
Mfr. Part No.AT3 15-48/50-4
BrandBlock
R 13,279.74
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. 310-1156
Mfr. Part No.SAT200
BrandBlock
R 1,526.23
Each
units
230V ac 115 V ac 200VA - - - - 166mm 166 x 76 x 77mm 76mm 77mm - - -
RS stock no. 347-6668
Mfr. Part No.CM2000/A/US
R 6,210.93
Each
units
230V ac 115V ac 2kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -
RS stock no. 738-7865
Mfr. Part No.AT3 10-48/50-4
BrandBlock
R 9,202.35
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 -
RS stock no. 310-1162
Mfr. Part No.SAT300
BrandBlock
R 2,619.17
Each
units
230V ac 115 V ac 300VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
RS stock no. 293-2656
Mfr. Part No.AIM 1.6/0.8
BrandBlock
R 1,376.07
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. 504-206
BrandRS PRO
R 5,141.27
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. 293-2678
Mfr. Part No.AIM 5.0/2.5
BrandBlock
R 2,613.79
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. 328-8051
Mfr. Part No.SAT 500
BrandBlock
R 3,032.80
Each
units
230V ac 115 V ac 500VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
RS stock no. 328-8067
Mfr. Part No.SAT 600
BrandBlock
R 3,035.37
Each
units
230V ac 115 V ac 600VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
RS stock no. 738-7890
Mfr. Part No.AT3 25-20/21-4
BrandBlock
R 47,092.30
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. 738-7837
Mfr. Part No.AT3 3,5-44/46-4
BrandBlock
R 4,220.00
Each
units
3 x 440 V ac, 460 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. 504-183
BrandRS PRO
R 1,637.07
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. 738-7821
Mfr. Part No.AT3 3,5-22/23-4
BrandBlock
R 8,432.28
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. 347-6652
Mfr. Part No.CM1000/A/US
R 4,593.01
Each
units
230V ac 114.2V ac 1kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -
RS stock no. 738-7874
Mfr. Part No.AT3 15-22/23-4
BrandBlock
R 21,697.29
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. 436-9842
Mfr. Part No.AIM10/5
BrandBlock
R 6,067.48
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. 504-199
BrandRS PRO
R 2,029.01
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 250VA Enclosed Chassis Mount, Floor Standing, Wall Mount - - 81mm 81 x 136 x 100mm 136mm 100mm 50Hz 60Hz -
RS stock no. 310-1140
Mfr. Part No.SAT100
BrandBlock
R 1,788.93
Each
units
230V ac 115 V ac 100VA - - - - 166mm 166 x 76 x 77mm 76mm 77mm - - -