Voltage Variators "Variac"
The variable transformers allows to obtain an alternating voltage smoothly and continously variabIe from zero to the line voltage or even higher.
All described models are for laboratory use, are closed and realisen into a metallic box with output on security terminals and protected against short circuits and overcharge.
For high power variators click on GOTO: HIGH POWER VARIATORS

Manufacturing standards designed and tested according to VDE-0552 EN 61010, EN 50081-1, EN 50082 and IEC 61558-2-14; designed as toroidal auto transformer under quality system UNI EN ISO 900
Single phase voltage variators


Output V


Power VA


0-220V a 0-260V

0,9A a 2A

0,18k a 0,45k


0-220V a 0-380V

1,2A a 4A

0,5k a 0,9k


0-220V a 0-380V

2,8A a 9A

0,9k a 2k


0-220V a 0-380V

5,2A a 15A

1,8k a 3,3k


0-220V a 0-380V

9A a 25A

3,5k a 5,7k


0-220V a 0-380V

18A a 32A

6k a 8k

CLICK for detailed list with characteristics

Three phase voltage variators


Output V

Current A

Power VA


0-220V a 0-450V

0,9A a 2,4A

0,9k a 1,4k


0-200V a 0-480V

1,8A a 5,6A

0,9k a 2,7k


0-220V a 0-480V

3,7A a 9A

1,8k a 6k


0-220V a 0-480V

6,5A a 19A

5,4k a 9,9k


0-220V a 0-480V

12,5A a 32A

10,5k a 17k


0-220V a 0-480V

21A a 44A

16,5k a 24k

CLICK for detailed list with characteristics

All regulators use grain-oriented strip would silicon steel cores ensuring low losses and reduce magnetising current.

The windings, which is insulated from the core by precision moulded winding formers, comprises a single layer (class H wire) carefully wound to provide a flat surface for the brushgear.

Easily replaceable carbon units are used, the resistance of the brush being carefully calculated to limit the current circulating in the bridged turns.
It is therefore most important that only the correct replacement brush is used in any particular Brushes are mounted in robust brush carriers insulated from the shaft, and designed so that metal parts cannot come into contact with the winding in the event of brush fracture.

The wound core and brush gear are mounted on a cast aluminium frame providing strenght combined with minimum weight. The base incorporated mounting holes providing interchangeable fixing centres with many other variable auto transformer.

Rated Current:
output current that can be draw at any brush setting for a continous duty.

Ambient temperature:
current ratings apply up to 45C ambient.

Line-Voltage and over-Voltage connection:
with line-voltage connections, the supply is connected across the whole winding, and the maximum output equals the applied voltage.
In over-voltage connection, the supply is applied to a tapping provide instead of to the whole winding, giving e.g.:0-280 Volt from a 220 Volt supply.

All variable transformers are flash-tested at 2,5KV.rms 50 Hz.

Voltage variators are available in an open version or closed in their sturdy metal enclosure.
Many options are handled on request like the motorized variation command with local or remote management, it can be also controlled by computer. The measuring instruments for output values (voltmeter, ammeter, wattmeter) analogue or digital are on the front panel and can be computer-connected to view and save all data.

CLICK for PDF with characteristics

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