Single-phase servo-driven voltage stabilizer SV, 2.5–50 kVA, 90–285 V input

Single-phase servo-driven voltage stabilizer SV, 2.5–50 kVA, 90–285 V input

Country: Spain · Model: SV

The single-phase servo-driven stabilizer of the SV series for 2.5–50 kVA works on a 165–255 V input, and in extended mode from 90 to 285 V, and holds 230 V at the output. It is chosen for private houses, country houses, boiler rooms, shops and workshops where the voltage drops sharply, especially at the end of long rural lines.

Series: SV
Phases: 1 phase
Ratings: 2.5; 3.5; 5; 7.5; 10; 15; 20; 25; 30; 40; 50 kVA
Input voltage: 165–255 V (maximum range 90–285 V)

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Technical specifications

Series	SV
Phases	1 phase
Ratings	2.5; 3.5; 5; 7.5; 10; 15; 20; 25; 30; 40; 50 kVA
Input voltage	165–255 V (maximum range 90–285 V)
Output voltage	230 V (220–240 V on request)
Frequency	47–65 Hz
Correction speed	90 V/s
Overload	200 % for 10 s
Regulation	servo drive controlled by a microprocessor
Protection	min./max. voltage, max. current; input circuit breaker
Harmonic distortion	none introduced
Load power factor	0.8 (1 on request)
Efficiency	> 96 %
Bypass	manual
Ingress protection	IP20 (IP54 on request)
Operating temperature	up to 50 °C
Altitude	up to 2000 m
Noise	< 50 dB
Certification	CE; ISO 9001 (TÜV Austria Hellas)

Ukrainian replacement/analogue

Specifications are taken from the manufacturer’s technical documentation. Updated 11/08/2026.

Description

The output can be set to 220 or 240 V on request. Regulation is smooth, because on a command from the microprocessor the servo drive moves the sliding contact along the winding of the regulating autotransformer, so the voltage changes without steps. The correction speed is 90 V/s, the voltage waveform is not distorted, and the unit introduces no harmonics. A double overload lasts up to 10 s, which matters when starting pumps, refrigerator compressors and air conditioners. The protection switches off the load when the voltage goes out of limits or the current is exceeded, and a circuit breaker is fitted at the input. The digital indicator shows input and output voltage, and the manual bypass makes it possible to service the unit without disconnecting the house from the mains. Efficiency is above 96 %, cooling is natural with a thermostat, the enclosure is IP20, or IP54 on request, operating temperature is up to 50 °C, altitude up to 2000 m, noise below 50 dB.

How to choose

The main criterion here is the input range. The range of ratings is 2.5 / 3.5 / 5 / 7.5 / 10 / 15 / 20 / 25 / 30 / 40 / 50 kVA. For a house with a gas boiler and household appliances 7.5–10 kVA is usually sufficient, with an electric boiler, water heater and pumps 15–25 kVA, and for small businesses up to 50 kVA. If the peak voltage drop is deep and the load is small, take a model with a power margin, because at low input voltage the permissible power of the stabilizer is reduced. When response speed matters more than the width of the range, the single-phase static stabilizer for 5–50 kVA with a speed of 1000 V/s will fit.

Request a price and lead time

Single-phase servo-driven voltage stabilizer SV, 2.5–50 kVA, 90–285 V input. We reply within one business day.

Or email office@usk.ua or call +38 (044) 339-50-20.

FAQ

What is the input range of the SV stabilizer?

Nominally 165–255 V, and 90–285 V in extended mode. The output is 230 V, or 220 or 240 V on request.

Why does a servo-driven stabilizer introduce no harmonics?

The voltage is regulated by smooth movement of the sliding contact along the autotransformer winding, not by power switches. The correction speed is 90 V/s.

Can it cope with the start of a pump or refrigerator?

The 200 % overload lasts 10 s, which is enough for the starting currents of pumps, compressors and air conditioners.

What SV rating should be chosen for a house?

With a gas boiler usually 7.5–10 kVA, with an electric boiler, water heater and pumps 15–25 kVA. At low input voltage the permissible power is reduced, so a margin is taken.

What certification and ingress protection does the SV have?

CE marking and an ISO 9001 quality system (TÜV Austria Hellas). The enclosure is IP20 or IP54 on request.