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VST/3000 Family

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Home Products Stabilizers Electromechanical three phase stabilizer VST/3000 Family

Electromechanical three-phase stabilizer

VST/3000 Family

The automatic voltage regulator or AVR is a device intended to regulate voltage automatically, that is to take a varying voltage level and turn it into a constant voltage level.
Varat's Automatic voltage regulators are for those applications where stable power is a requirement.

Electromechanical three-phase stabilizer with independent regulators on each phase  + Neutral

Three phase electromechanical voltage stabilizers VST from 6kVA to 20 kVA

"VST" automatic three phase voltage stabilizers with electronic control and INDEPENDENT VOLTAGE REGULATION ON EACH PHASE are essential for the use with any unbalanced loads. The stabilizers use three control circuits and three servo-motors; each phase is individually regulated, making the voltage rigorously constant near the rated value. The "VST" stabilizers are ideal for any application and very silent, totally free from magnetic leakage and do not introduce harmonic distortion. Neutral wire is necessary for a proper operation. "VST" stabilizers are equipped with an automatic 3-poles circuit breaker, digital voltmeter with input and output voltage reading on each phase, fine voltage regulation on each phase.



Power from 6kVA to 30kVA
Input voltage 400V three phase A.C. + N.
Input voltage acceptable variation 15% (from 340V to 460V)
Output voltage 400V three phase A.C. + N.
Output voltage accuracy 1% with independent regulation on each phase
Fine voltage regulation 5% on each phase separately
Frequency 50/60Hz
Regulation speed 20/1000 sec. / Volt
Load tolerable variation 0 - 100%
Load acceptable unbalance 0 - 100%
Acceptable power factor 0 - 1
Full load efficiency > 98%
Harmonic distortion < 0,5%
Ambient temperature 0 : 45C
Altidude up to 1000m. without derating
Standards IEC 686
Cooling Air natural to 15 kVA
Forced cooling (fans) from 22 kVA to 30 kVA
Protections Automatic 4-poles circuit breaker
Digital V-meter with in/out reading switch and phase/phase or phase/N reading on each phase
Fine output voltage regulation within 5% on each phase In/out connectors


Power Part no. Dimensions (mm) DWG Weight
kVA A B C Kg
6 VST06K 600 300 800 A 80
9 VST09K 600 300 800 A 85
12 VST12K 600 300 800 A 90
15 VST15K 600 300 800 A 97
22 VST22K 600 300 800 A 112
30 VST30K 600 300 800 A 125

Three phase electromechanical voltage stabilizers VST from 40kVA to 500 kVA

Power Input Output Frequency Speed Accuracy
From 40KVA to 500KVA 400V 15% 400V 50/60 Hz 20 mSEC/V* 1,5%

Our range of electromechanical three phase "VST" voltage stabilizers has been recently extended including five new models from 150kVA up to 500kVA supporting customers which required higher ratings with high levels of efficiency and accuracy. The regulation is independent for each single phase using toroidal voltage regulators of high power and fast regulation speed. "VST" has digital voltmeters with input and output voltage readings on each phase and A-meters on each phase. Protection is assured by an automatic circuit breaker on input up to 100kVA, while fuse protection, automatic circuit breaker or main circuit breaker are available on request for higher ratings. Input and output connections are possible on each side and from the bottom side through an internal board.

The electronic control which gives the regulation assures an output accuracy less than 1.5% with the option of regulating the voltage within the 5% of the nominal output voltage.

Manufactured according to IEC 60686 standards, it is not affected by power factor of load unbalance, and can be connected to a totally (100%) unbalanced load
Power from 40kVA to 500kVA
Input voltage 400V three phase A.C. + N.
Input voltage acceptable variation 15% (from 340V to 460V) different range available on request
Output voltage 400V three phase A.C. + N.
Output voltage accuracy 1% with independent regulation on each phase
Fine voltage regulation 5% separately on each phase up to 300 kVA
Frequency 50/60Hz
Regulation speed 20/1000 sec. / Volt
Load tolerable variation from 0 to 100%
Load acceptable unbalance 0 - 100%
Acceptable power factor 0 - 1
Full load efficiency > 98%
Harmonic distortion < 0,5%
Ambient temperature 0 : 45C
Altidude up to 1000m. on sea level without derating
Standards IEC 60686
Cooling Forced air
Protections 4-poles magnetic circuit breaker (up to 100 kVA)
RFI filter as a protection of control circuit
Surge protection on electronic control
Standard accessories Thermal-magnetic circuit breaker, digital voltage analyser with four displays with simultaneous reading of values on the three phases, input/output voltage selector, output current, power factor, frequency, internal temperature. Fine regulation of output stabilised voltage, IN/OUT connectors sized to the rating.
Power Part no. Dimensions (mm) DWG Weight
kVA A B C Kg
40 VST 040K 600 400 1500 A 250
50 VST 050K 600 600 1500 A 280
60 VST 060K 600 600 1900 A 315
80 VST 080K 600 600 1900 A 350
100 VST100K 600 600 1900 A 380
150 VST 150K 1200 600 1900 B 500
200 VST 200K 1200 800 1900 B 650
300 VST 300K 1200 800 2100 B 830
400 VST 400K 2400 800 2100 C 1000
500 VST 500K 2400 800 2100 C 1600

Technical sheet download in PDF

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