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.
• 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

Read more Read less


Viewing 1 - 3 of 3 products
Results per page
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. 436-8883
Mfr. Part No.CM3000/A/US
230V 114.1V ac 3kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -
RS Stock No. 347-6668
Mfr. Part No.CM2000/A/US
230V ac 115V ac 2kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -
RS Stock No. 347-6652
Mfr. Part No.CM1000/A/US
230V ac 114.2V ac 1kVA - - Bobbin - 205mm 205 x 195 x 260mm 260mm 190mm - - -