1. Chassis mounting Auto wound Transformer
2. Why and where used
Autotransformers have the advantages of often being smaller, lighter, and cheaper than typical dual-winding transformers, but autotransformers have the disadvantage of not providing electrical isolation.
Autotransformers are often used to step up or step down voltages in the 110-115-120 volt range and voltages in the 220-230-240 volt range—for example. Providing 110 or 120V (with taps) from 230V input, allowing equipment designed for 100 or 120 volts to be used with a 230 volt supply (as in using US electrical equipment with higher European voltages
3. What is an Auto Transformer?
An autotransformer (sometimes called auto step down transformer)is an electrical transformer with only one winding. The "auto” prefix refers to the single coil acting on itself and not to any kind of automatic mechanism In an autotransformer, portions of the same winding act as both the primary and secondary sides of the transformer. The winding has at least three taps where electrical connections are made.
The Toroidal construction of an auto-transformer offers important advantages in comparison with an E/I lamination core transformer, like smaller physical size and weight, 30-70% reduction (depending on secondary voltage) and very low magnetic stray fields. The auto-transformer can be mounted horizontally using a steel washer or an epoxy potted centre with a mounting hole
4. Wiring circuit diagram
Auto transformers can be used to step-up or step-down for example a “0-110-230v” transformer may be used to covert 110v to 230v (step-up) or covert 230v to 110v (Step-down)
0-110-230 Blue Black Brown
0-115-230v Blue Black Brown
0-120-230 Blue Black Brown
0-110-415 White Black Red
0-230-415 Blue Black Red
Auto transformer share the same neutral usually the Blue
5. Installation notes
As an auto transformer both the input and output share a common neutral and earth.
6. Quality Control
All transformers manufactured by Airlink Transformers have been subject to the BS EN ISO9001:2008 management standards
Conforms BSEN61558-2-13 CE & RoHS