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
Autotransformers
Filters
| 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.
504-199
BrandRS PRO
|
£62.80
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.
293-2656
Mfr. Part No.AIM 1.6/0.8
BrandBlock
|
£40.35
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.
310-1156
Mfr. Part No.SAT200
BrandBlock
|
£38.20
Each
Units
|
230V ac | 115 V ac | 200VA | - | - | - | - | 166mm | 166 x 76 x 77mm | 76mm | 77mm | - | - | - |
|
RS Stock No.
310-1162
Mfr. Part No.SAT300
BrandBlock
|
£50.86
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
|
£38.40
Each
Units
|
230V ac | 115 V ac | 100VA | - | - | - | - | 166mm | 166 x 76 x 77mm | 76mm | 77mm | - | - | - |
|
RS Stock No.
436-8877
Mfr. Part No.CMA30K/FM0
BrandCarroll & Meynell
|
£572.71
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.
436-8883
Mfr. Part No.CM3000/A/US
BrandCarroll & Meynell
|
£161.04
Each
Units
|
230V | 114.1V ac | 3kVA | - | - | Bobbin | - | 205mm | 205 x 195 x 260mm | 260mm | 190mm | - | - | - |
|
RS Stock No.
328-8051
Mfr. Part No.SAT 500
BrandBlock
|
£84.27
Each
Units
|
230V ac | 115 V ac | 500VA | - | - | - | - | 223mm | 223 x 97 x 117mm | 97mm | 117mm | - | - | - |
|
RS Stock No.
504-183
BrandRS PRO
|
£55.82
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.
504-202
BrandRS PRO
|
£39.99
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.
293-2678
Mfr. Part No.AIM 5.0/2.5
BrandBlock
|
£81.65
Each
Units
|
115 V ac, 230 V ac | 20 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.
436-9858
Mfr. Part No.AIM16/8
BrandBlock
|
£205.90
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.
436-9842
Mfr. Part No.AIM10/5
BrandBlock
|
£164.12
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
BrandCarroll & Meynell
|
£135.72
Each
Units
|
230V ac | 115V ac | 2kVA | - | - | Bobbin | - | 205mm | 205 x 195 x 260mm | 260mm | 190mm | - | - | - |
|
RS Stock No.
436-8861
Mfr. Part No.CMA10K/FM0
BrandCarroll & Meynell
|
£400.02
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.
504-206
BrandRS PRO
|
£134.58
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.
293-2662
Mfr. Part No.AIM 3.2/1.6
BrandBlock
|
£67.29
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.
328-8067
Mfr. Part No.SAT 600
BrandBlock
|
£83.77
Each
Units
|
230V ac | 115 V ac | 600VA | - | - | - | - | 223mm | 223 x 97 x 117mm | 97mm | 117mm | - | - | - |
|
RS Stock No.
504-189
BrandRS PRO
|
£54.94
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.
504-195
BrandRS PRO
|
£87.52
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 | - |
