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. 504-202
BrandRS PRO
SGD63.13
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. 504-189
BrandRS PRO
SGD115.60
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. 504-199
BrandRS PRO
SGD136.10
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. 504-183
BrandRS PRO
SGD120.97
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. 504-206
BrandRS PRO
SGD291.67
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. 504-195
BrandRS PRO
SGD207.90
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. 310-1156
Mfr. Part No.SAT200
BrandBlock
SGD75.49
Each
units
230V ac 115 V ac 200VA - - - - 166mm 166 x 76 x 77mm 76mm 77mm - - -
RS Stock No. 328-8067
Mfr. Part No.SAT 600
BrandBlock
SGD197.60
Each
units
230V ac 115 V ac 600VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
RS Stock No. 436-8883
Mfr. Part No.CM3000/A/US
SGD329.16
Each
units
230V 114.1V ac 3kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -
RS Stock No. 310-1162
Mfr. Part No.SAT300
BrandBlock
SGD109.76
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
SGD117.22
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
SGD204.44
Each
units
230V ac 115 V ac 500VA - - - - 223mm 223 x 97 x 117mm 97mm 117mm - - -
RS Stock No. 293-2656
Mfr. Part No.AIM 1.6/0.8
BrandBlock
SGD89.91
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. 436-9842
Mfr. Part No.AIM10/5
BrandBlock
SGD325.25
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. 347-6668
Mfr. Part No.CM2000/A/US
SGD271.97
Each
units
230V ac 115V ac 2kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -
RS Stock No. 436-9858
Mfr. Part No.AIM16/8
BrandBlock
SGD414.82
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. 158-7328
Mfr. Part No.EJET500
BrandBlock
SGD534.96
Each
units
230V ac 110 V ac 500VA Enclosed - - Cable 180mm 180 x 126 x 192mm 126mm 192mm 50Hz 60Hz -
RS Stock No. 293-2662
Mfr. Part No.AIM 3.2/1.6
BrandBlock
SGD114.59
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. 293-2678
Mfr. Part No.AIM 5.0/2.5
BrandBlock
SGD205.34
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. 158-7312
Mfr. Part No.E-JET 250
BrandBlock
SGD402.53
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 -
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