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. 320-0944
Mfr. Part No.SD-1603B
£12.76
Each
Units
200 V ac, 220 V ac 10 V ac, 12 V ac, 14 V ac, 16 V ac, 8 V ac 4.8VA - Chassis Mount - - 73mm 73 x 42 x 43mm 42mm 43mm - - -
RS Stock No. 320-1234
Mfr. Part No.FR-762B
£35.30
Each
Units
200 V ac, 220 V ac 24 V ac, 26 V ac 52VA - Chassis Mount - - 105mm 105 x 65 x 70mm 65mm 70mm - - -
RS Stock No. 320-1076
Mfr. Part No.SD-2405
£18.63
Each
Units
100 V ac, 110 V ac 12 V ac, 15 V ac, 20 V ac, 6 V ac 12VA - Chassis Mount - - 84mm 84 x 48 x 52mm 48mm 52mm - - -
RS Stock No. 320-1284
Mfr. Part No.CA-20B
£11.15
Each
Units
200 V ac, 220 V ac 12 V ac 6VA - Chassis Mount - - 73mm 73 x 42 x 43mm 42mm 43mm - - -
RS Stock No. 320-0865
Mfr. Part No.SD-121B
£19.32
Each
Units
200 V ac, 220 V ac 10 V ac, 12 V ac, 6 V ac, 8 V ac 12VA - Chassis Mount - - 84mm 84 x 48 x 52mm 48mm 52mm - - -
RS Stock No. 320-1278
Mfr. Part No.CA-19B
£9.45
Each
Units
200 V ac, 220 V ac 12 V ac 3VA - Chassis Mount - - 61mm 61 x 33 x 35mm 33mm 35mm - - -
RS Stock No. 320-1357
Mfr. Part No.CA-42
£32.63
Each
Units
100V ac 24 V ac 48VA - Chassis Mount - - 105mm 105 x 65 x 70mm 65mm 70mm - - -
RS Stock No. 320-0843
Mfr. Part No.SD-122
£23.18
Each
Units
100 V ac, 110 V ac 10 V ac, 12 V ac, 6 V ac, 8 V ac 24VA - Chassis Mount - - 91mm 91 x 58 x 60mm 58mm 60mm - - -
RS Stock No. 320-1329
Mfr. Part No.CA-39
£11.15
Each
Units
100V ac 24 V ac 6VA - Chassis Mount - - 73mm 73 x 42 x 43mm 42mm 43mm - - -
RS Stock No. 320-1341
Mfr. Part No.CA-41
£21.48
Each
Units
100V ac 24 V ac 24VA - Chassis Mount - - 91mm 91 x 58 x 60mm 58mm 60mm - - -
RS Stock No. 320-2552
Mfr. Part No.CA-22
£18.60
Each
Units
100V ac 12 V ac 24VA - Chassis Mount - - 91mm 91 x 58 x 60mm 58mm 60mm - - -
RS Stock No. 320-0815
Mfr. Part No.SD-0610B
£13.99
Each
Units
200 V ac, 220 V ac 2.5 V ac, 5 V ac, 6 V ac 6VA - Chassis Mount - - 73mm 73 x 42 x 43mm 42mm 43mm - - -
RS Stock No. 320-0988
Mfr. Part No.SD-162B
£29.86
Each
Units
200 V ac, 220 V ac 10 V ac, 12 V ac, 14 V ac, 8 V ac 32VA - Chassis Mount - - 91mm 91 x 67 x 60mm 67mm 60mm - - -
RS Stock No. 320-1004
Mfr. Part No.SD-1805
£18.79
Each
Units
100V ac 14 V ac, 16 V ac, 18 V ac, 20 V ac 10VA - Chassis Mount - - 84mm 84 x 48 x 52mm 48mm 52mm - - -
RS Stock No. 320-0994
Mfr. Part No.SD-163B
£38.04
Each
Units
200 V ac, 220 V ac 10 V ac, 12 V ac, 14 V ac, 16 V ac, 8 V ac 48VA - Chassis Mount - - 105mm 105 x 65 x 70mm 65mm 70mm - - -
RS Stock No. 320-0916
Mfr. Part No.SD-161
£20.21
Each
Units
100V ac 10 V ac, 12 V ac, 14 V ac, 8 V ac 16VA - Chassis Mount - - 91mm 91 x 54 x 60mm 54mm 60mm - - -
RS Stock No. 320-1420
Mfr. Part No.FB-263
£48.40
Each
Units
100 V ac, 200 V ac 24 V ac, 26 V ac 78VA - Chassis Mount - - 86mm 86 x 95 x 77mm 95mm 77mm - - -
RS Stock No. 320-0821
Mfr. Part No.SD-1205
£15.60
Each
Units
100V ac 10 V ac, 12 V ac, 6 V ac, 8 V ac 6VA - Chassis Mount - - 71mm 71 x 44 x 43mm 44mm 43mm - - -
RS Stock No. 320-0871
Mfr. Part No.SD-122B
£24.68
Each
Units
200 V ac, 220 V ac 10 V ac, 12 V ac, 6 V ac, 8 V ac 24VA - Chassis Mount - - 91mm 91 x 58 x 60mm 58mm 60mm - - -
RS Stock No. 320-1408
Mfr. Part No.FB-261
£26.83
Each
Units
100 V ac, 200 V ac 24 V ac, 26 V ac 26VA - Chassis Mount - - 92mm 92 x 62 x 60mm 62mm 60mm - - -