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ATSS0400 - 230/110V 400VA step-down autotransformer

400W (3,3A)
ATSS0400 - 230/110V 400VA step-down autotransformer
on sale
Dispatched within:
3 days
Price: 147,00 zł
Net price: 119,51 zł

230/110V 400VA step-down autotransformer without housing, for powering low and medium size appliances originated in USA, Japan, Canada and other countries with 100 - 115V electricity.

How to select transformer (converter, power supply adaptor) for 110 V USA appliances?

Manufacturers usually print appliance’s parameters on the attached tag, displaying its power in Watts [W]. In that case it’s simple. If the power is for example 245 W, select a transformer that is closest to that value on the available list, adding an extra margin of power for safety. In this example, a 300VA transformer should be selected. Some manufacturers display parameters in  Amperes [A]or [Amps] as an electric current required for proper operation; for example 2.7 A or 2.7 Amps. You then need to multiply number of Amperes by 120. In this case 2.7 x 120 = 324. The result represents the approximate power of transformer needed. After adding a safety margin of at least 20%, 400 VA transformer should be selected.


The power of a transformer must always be higher than the power of the apliance connected to that transformer. Otherwise,  either unit can sustain serious damage.

Technical data

Nominal power 400VA
Output voltage 230V
Input voltage 110V
Casing type none
Sockets none
Inrush current limiter No
Ground No
Overload protection none
Weight 1,7kg
Size 108x42mm

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