Step up/step down: Auto transformers

With its small size and weight, the auto-transformer can be installed easily in existing equipment or supplied in an enclosure, with or without cord, plug and receptacle.

Input 120V to 240V and
Input 240V to 120V

Input 110V to 415V and
Input 415V to 110V

Input 230V to 415V and
Input 415V to 415V

• Toroidal Open Style
• Single hole fixing through centre
• Terminal Blocks
• Suitable for American machinery or appliances
• Dispatched within 48 hours
• All prices quoted ex-VAT unless otherwise stated
• British built
• Conforms to BSEN61555-2-13

Part No. Product 1+ 5+ 25+ 50+ 100+ Quantity   AT0035 30VA 230V / 415V Step up/step down autotransformer (Screw terminals) £16.38 £15.56 £14.74 £14.33 £13.92   AT0100 100VA 230V / 120V Step up/step down autotransformer (Screw terminals) £15.74 £14.95 £14.17 £13.77 £13.38   AT0030 30VA 230V / 120V Step up/step down autotransformer (Screw terminals) £15.06 £14.31 £13.55 £13.18 £12.80   AT0241 200VA 415V / 110V Step up/step down autotransformer (Screw terminals) £22.00 £20.90 £19.80 £19.25 £18.70   AT0250 250VA 230V / 120V Step up/step down autotransformer (Screw terminals) £20.48 £19.46 £18.43 £17.92 £17.41   AT0251 250VA 230V / 110V Step up/step down autotransformer (200mm flexible leads) £16.24 £15.43 £14.62 £14.21 £13.80   AT0500 500VA 230V / 120V Step up/step down autotransformer (Screw terminals) £30.00 £28.50 £27.00 £26.25 £25.50   AT0501 500VA 0-115-220-230-240v Step up/step down autotransformer (Screw terminals) £34.00 £32.30 £30.60 £29.75 £28.90   AT0600 600VA 0-120-230v Step up/step down autotransformer (200mm flexible leads) £36.00 £34.20 £32.40 £31.50 £30.60   AT0641 600VA 0-240-415v Step up/step down autotransformer (200mm flexible leads) £36.00 £34.20 £32.40 £31.50 £30.60   AT1000 1kVA 230V / 120V Step up/step down autotransformer (Screw terminals) £44.00 £41.80 £39.60 £38.50 £37.40   AT1415 1kVA 230V / 415V Step up/step down autotransformer (Screw terminals) £50.00 £47.50 £45.00 £43.75 £42.50   AT1500 1.5kVA 230V / 120V Step up/step down autotransformer (Screw terminals) £60.00 £57.00 £54.00 £52.50 £51.00     AT1538 1.5kVA 0-230-380v Step up/step down autotransformer (Screw terminals) £60.00 £57.00 £54.00 £52.50 £51.00                       AU01500 1.5kVA 230V / 115V Step up/step down autotransformer (Screw terminals) £90.00 £85.50 £81.00 £78.75 £76.50                       AT2000 2kVA 230V / 120V Step up/step down autotransformer (Screw terminals) £70.00 £66.50 £63.00 £61.25 £59.50   AT3000 3kVA 230V / 120V Step up/step down autotransformer (Screw terminals) £94.00 £89.30 £84.60 £82.25 £79.90   AT3041 3kVA 230V / 415V Step up/step down autotransformer (Screw terminals) £102.00 £96.90 £91.80 £89.25 £86.70                       AU03001 3kVA 100 200V Step up/step down autotransformer (Screw terminals) £130.00           AU03110 3kVA 230V / 110V Step up/step down autotransformer (Screw terminals) £130.00 £123.50 £117.00 £113.75 £110.50   AU040110 4kVA 230V / 110V Step up/step down autotransformer (Screw terminals) £156.00 £148.20 £140.40 £136.50 £132.60                       AT5010 5kVA 110V / 230V Step up/step down autotransformer (Screw terminals) £130.00 £123.50 £117.00 £113.75 £110.50   AT5041 5kVA 230V / 415V Step up/step down autotransformer (Screw terminals) £130.00 £123.50 £117.00 £113.75 £110.50   AT5045 5kVA 230V / 415V Step up/step down autotransformer (Screw terminals) £150.00 £142.50 £135.00 £131.25 £127.50   AT5480 5kVA 400V / 480V Step up/step down autotransformer (Screw terminals) £120.00 £114.00 £108.00 £105.00 £102.00                       AU06110 6kVA 230V / 110V Step up/step down autotransformer (Screw terminals) £210.00 £199.50 £189.00 £183.75 £178.50   AU06120 6kVA 230V / 120V Step up/step down autotransformer (Screw terminals) £218.00 £207.10 £196.20 £190.75 £185.30   AU06415 6kVA 415V / 230V Step up/step down autotransformer (Screw terminals) £180.00 £171.00 £162.00 £157.50 £153.00                       AT7041 7kVA 230V / 415V Step up/step down autotransformer (Screw terminals) £200.00 £190.00 £180.00 £175.00 £170.00                       AU08110 8kVA 230V / 110V Step up/step down autotransformer (Screw terminals) £212.00 £201.40 £190.80 £185.50 £180.20     AU08110S 8kVA 230V / 110V Step up/step down autotransformer (Screw terminals) £224.00 £212.80 £201.60 £196.00 £190.40   AU08240 8kVA 240V / 264V Step up/step down autotransformer (Screw terminals) £224.00 £212.80 £201.60 £196.00 £190.40   AU10110 10kVA 230V / 110V Step up/step down autotransformer (Screw terminals) £248.00 £235.60 £223.20 £217.00 £210.80   AU10120 10kVA 230V / 120V Step up/step down autotransformer (Screw terminals) £260.00 £247.00 £234.00 £227.50 £221.00

Using an auto-transformer is always an economical solution when you need to step down the voltage from 230V to 120V or vice versa, and the equipment already has a fully isolated transformer or when the components do not require an isolated transformer.

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 center with a mounting hole.

With its small size and weight, the auto-transformer can be installed easily in existing equipment or supplied in an optional enclosure with or without cord, plug and receptacle

Step up step down auto transformers