Variable autotransformers

Single-phase and three-phase variable autotransformers are designed to power AC electrical equipment. Robust metal construction, high-quality transformer and linear voltage regulation are used in all areas of electrical engineering.

Properties of variable autotransformers

Sine waveform of the output voltage 50 Hz.
Three-phase design with separate output from the power supply network.
Single-phase design with output not galvanically separated from the power supply network.
Analog voltage meter.
Analog current meter.
Linear adjustment of the output voltage with a rotary knob.
Signaling of the on state by a light switch.
Output voltage in the socket on the front panel.
Handle for easy portability.
Robust metal chassis.
Sufficiently dimensioned transformer for permanent supply of power to the load.

RA1F250.031

Single-phase variable autotransformer
0 ÷ 230 V / 3,1 A

RA1F250.100

Single-phase variable autotransformer
0 ÷ 230 V / 10 A

RA1F250.200

Single-phase variable autotransformer
0 ÷ 230 V / 20 A

RZ3F400.020

Three-phase variable autotransformer
5 ÷ 400 V / 2,0 A

RZ3F400.060

Three-phase variable autotransformer
5 ÷ 400 V / 6,0 A

RA1F250.031

Single-phase variable autotransformer

0 ÷ 230 V / 3,1 A

Technical parameters

Supply voltage	230 V / 50 Hz
Output voltage	< 5 ÷ 230 V
Output current	3,1 A
Output frequency	50 Hz (same as mains frequency)
Output voltage stability	according to network stability
Output frequency stability	according to network stability
Galvanically isolated output	NO
Voltage measuring device	analog
Current measuring device	analog
Accuracy of measuring devices	1,5% of the range
Working temperature	10 ÷ 30 °C
Fuse / mains circuit breaker circuit breaker	T 250 V / 4,0 A
Output fuse / circuit breaker circuit breaker	T 250 V / 3,15 A
Length of the power supply cable	2 m (separable)
Colour	black
Dimensions in mm (h, w, d)	approx. 317 x 282 x 172
Weight	approx. 8,4 kg
Warranty	24 months

RA1F250.100

Single-phase variable autotransformer

0 ÷ 230 V / 10 A

Technical parameters

Supply voltage	230 V / 50 Hz
Output voltage	< 5 ÷ 230 V
Output current	10,0 A
Output frequency	50 Hz (same as mains frequency)
Output voltage stability	according to network stability
Output frequency stability	according to network stability
Galvanically isolated output	NO
Voltage measuring device	analog
Current measuring device	analog
Accuracy of measuring devices	1,5% of the range
Working temperature	10 ÷ 30 °C
Fuse / mains circuit breaker circuit breaker	T 250 V / 12,5 A
Output fuse / circuit breaker circuit breaker	circuit breaker B 10,0 A
Length of the power supply cable	2 m (separable)
Colour	black
Dimensions in mm (h, w, d)	approx. 360 x 282 x 262
Weight	approx. 14,8 kg
Warranty	24 months

RA1F250.200

Single-phase variable autotransformer

0 ÷ 230 V / 20 A

Technical parameters

Supply voltage	230 V / 50 Hz
Output voltage	< 5 ÷ 230 V
Output current	20,0 A
Output frequency	50 Hz (same as mains frequency)
Output voltage stability	according to network stability
Output frequency stability	according to network stability
Galvanically isolated output	NO
Voltage measuring device	analog
Current measuring device	analog
Accuracy of measuring devices	1,5% of the range
Working temperature	10 ÷ 30 °C
Fuse / mains circuit breaker circuit breaker	circuit breaker B 25,0 A
Output fuse / circuit breaker circuit breaker	circuit breaker B 10,0 A
Length of the power supply cable	2 m (separable)
Colour	black
Dimensions in mm (h, w, d)	approx. 360 x 282 x 262
Weight	approx. 22,2 kg
Warranty	24 months

RZ3F400.020

Three-phase variable autotransformer with separated output of mains

5 ÷ 400 V / 2,0 A

Technical parameters

Supply voltage	3x 400 V / 50 Hz
Output voltage	3x < 5 ÷ 400 V
Output current	3x 2,0 A
Output frequency	50 Hz (same as mains frequency)
Output voltage stability	according to network stability
Output frequency stability	according to network stability
Galvanically isolated output	YES
Voltage measuring device	3x analog
Current measuring device	3x analog
Accuracy of measuring devices	1,5% of the range
Working temperature	10 ÷ 30 °C
Fuse / mains circuit breaker circuit breaker	D 3x 6,0 A
Output fuse / circuit breaker circuit breaker	B 3x 2,0 A
Length of the power supply cable	2 m (separable)
Colour	black
Dimensions in mm (h, w, d)	approx. 377 x 357 x 466
Weight	approx. 40,8 kg
Warranty	24 months

RZ3F400.060

Three-phase variable autotransformer with separated output of mains

5 ÷ 400 V / 6,0 A

Technical parameters

Supply voltage	3x 400 V / 50 Hz
Output voltage	3x < 5 ÷ 400 V
Output current	3x 6,0 A
Output frequency	50 Hz (same as mains frequency)
Output voltage stability	according to network stability
Output frequency stability	according to network stability
Galvanically isolated output	YES
Voltage measuring device	3x analog
Current measuring device	3x analog
Accuracy of measuring devices	1,5% of the range
Working temperature	10 ÷ 30 °C
Fuse / mains circuit breaker circuit breaker	D 3x 10,0 A
Output fuse / circuit breaker circuit breaker	B 3x 6,0 A
Length of the power supply cable	2 m (separable)
Colour	black
Dimensions in mm (h, w, d)	approx. 377 x 357 x 466
Weight	approx. 80,0 kg
Warranty	24 months

In detail

Sine waveform of the output voltage

The output voltage is obtained by transforming the mains voltage 230 V / 50 Hz. The output voltage curve is clean with a frequency of 50 Hz without parasitic fluctuations.