Three-phase stepped thyristor voltage stabilizers Volter 10.5–81 kW (S, PT, PTS, PTSh, PTSSh)

Three-phase stepped thyristor voltage stabilizers Volter 10.5–81 kW (S, PT, PTS, PTSh, PTSSh)

Country: Ukraine · Model: S / PT / PTS / PTSh / PTSSh

Three-phase stepped thyristor stabilizers Volter rated 10.5–81 kW (3×4 … 3×27) level the voltage on each phase by switching steps in 20 ms. There are five versions, from the standard S to PTSSh, and they differ in accuracy and input range. The series is meant for workshops, pumping stations, warehouses and sites with moderate demands on voltage waveform.

Models and power: 12 (3×4) — 10.5 kW, 16 A; 21 (3×7) — 32 A; 27 (3×9) — 40 A; 33 (3×11) — 50 A; 42 (3×14) — 63 A; 54 (3×18) — 80 A; 66 (3×22) — 100 A; 81 (3×27) — 125 A
Module per phase (H×W×D): 350×420×160…190 mm (12–42 kW); 650×420×190 mm (54–81 kW)
Module weight: 19–37.5 kg (12–42 kW); 50–67.6 kg (54–81 kW)
Versions: S — standard (±6.5 %, 9 steps, input 125–265 V); PT — increased accuracy (+2/−3 %, 16 steps, input ~145–245 V); PTS — increased accuracy with symmetric input voltage range (input ~170–265 V); PTSh — wide range (+3.5/−5.5 %, input 110–250 V); PTSSh — symmetric wide range (input ~145–285 V)

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Technical specifications

Models and power	12 (3×4) — 10.5 kW, 16 A; 21 (3×7) — 32 A; 27 (3×9) — 40 A; 33 (3×11) — 50 A; 42 (3×14) — 63 A; 54 (3×18) — 80 A; 66 (3×22) — 100 A; 81 (3×27) — 125 A
Module per phase (H×W×D)	350×420×160…190 mm (12–42 kW); 650×420×190 mm (54–81 kW)
Module weight	19–37.5 kg (12–42 kW); 50–67.6 kg (54–81 kW)
Versions	S — standard (±6.5 %, 9 steps, input 125–265 V); PT — increased accuracy (+2/−3 %, 16 steps, input ~145–245 V); PTS — increased accuracy with symmetric input voltage range (input ~170–265 V); PTSh — wide range (+3.5/−5.5 %, input 110–250 V); PTSSh — symmetric wide range (input ~145–285 V)
Type	electronic thyristor (stepped regulation)
Efficiency	98 %
Response time	20 ms
Output voltage	220 V per phase
Transit cut-off	260 ± 5 V
Turn-on delay	4.5–7.5 s
Cooling	natural
Protection degree	IP20
Operating conditions	+1…+40 °C indoors, humidity 40–80 %
Frost-resistant treatment	to order

Analogues in the catalogue

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

Description

The circuit is built on thyristor switches and a tapped transformer, has no moving parts, needs no maintenance and uses natural cooling. The frame sizes are 12 (3×4) at 10.5 kW and 16 A, 21 (3×7) at 32 A, 27 (3×9) at 40 A, 33 (3×11) at 50 A, 42 (3×14) at 63 A, 54 (3×18) at 80 A, 66 (3×22) at 100 A and 81 (3×27) at 125 A. Output is 220 V per phase, efficiency 98 %, the transit cut-off threshold 260 ± 5 V and the turn-on delay 4.5–7.5 s. Protection acts against overload, short circuit, overheating and overvoltage. IP20 and the conditions of +1…+40 °C at 40–80 % humidity set indoor installation. Mounting is wall or floor, and frost-resistant treatment is made to order.

How to choose

Start with the version. S gives ±6.5 % on 9 steps with a 125–265 V input. PT is tighter at +2/−3 % on 16 steps with roughly 145–245 V, and PTS moves the input to about 170–265 V. For deep sags take PTSh with +3.5/−5.5 % and 110–250 V, or PTSSh with about 145–285 V. If stepless regulation is needed, look at the inverter Smart over the same 10.5–81 kW. Supplied as the official representative in Ukraine.