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 Mounting Type Termination Type Length Dimensions Width Depth Minimum Temperature Maximum Temperature Efficiency Number of Phases Protection Features
RS Stock No. 293-2656
Mfr. Part No.AIM 1.6/0.8
BrandBlock
$126.10
Each
units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Panel Mount Screw 166mm 166 x 77 x 76mm 77mm 76mm -20°C +40°C - - -
RS Stock No. 504-202
BrandRS PRO
$84.83
Each
units
230V ac 115V ac 50VA Chassis Mount, Floor Standing, Wall Mount - 58mm 58 x 63 x 70mm 63mm 70mm - - 0.922 1 -
RS Stock No. 504-189
BrandRS PRO
$120.52
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 150VA Chassis Mount, Floor Standing, Wall Mount - 73mm 73 x 120 x 89mm 120mm 89mm - - 0.942 1 -
RS Stock No. 504-199
BrandRS PRO
$145.27
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 250VA Chassis Mount, Floor Standing, Wall Mount - 81mm 81 x 136 x 100mm 136mm 100mm - - 0.947 1 -
RS Stock No. 436-9842
Mfr. Part No.AIM10/5
BrandBlock
$428.25
Each
units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Panel Mount Screw 283mm 283 x 200 x 165mm 165mm 200mm -20°C +40°C - - -
RS Stock No. 436-9858
Mfr. Part No.AIM16/8
BrandBlock
$555.60
Each
units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Panel Mount Screw 284mm 283 x 200 x 165mm 165mm 200mm -20°C +40°C - - Short Circuit Protection
RS Stock No. 504-195
BrandRS PRO
$193.34
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 500VA Chassis Mount, Floor Standing, Wall Mount - 98mm 98 x 145 x 118mm 145mm 118mm - - 0.958 1 -
RS Stock No. 293-2678
Mfr. Part No.AIM 5.0/2.5
BrandBlock
$164.98
Each
units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac - Panel Mount Screw 223mm 223 x 97 x 117mm 97mm 117mm -20°C +40°C - - -
RS Stock No. 293-2662
Mfr. Part No.AIM 3.2/1.6
BrandBlock
$190.27
Each
units
115 V ac, 230 V ac 115 V ac, 220 V ac, 230 V ac, 240 V ac - Panel Mount Screw 223mm 223 x 97 x 117mm 97mm 117mm -20°C +40°C - - -
RS Stock No. 504-183
BrandRS PRO
$107.64
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 100VA Chassis Mount, Floor Standing, Wall Mount - 65mm 65 x 115 x 78mm 115mm 78mm - - 0.934 1 -
RS Stock No. 504-206
BrandRS PRO
$242.13
Each
units
220 V ac, 230 V ac, 240 V ac 115V ac 1kVA Chassis Mount, Floor Standing, Wall Mount - 115mm 115 x 192 x 137mm 192mm 137mm - - 0.96 1 -
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