VARIAC — variable autotransformers, toroidal up to 50 kVA and column up to 500 kVA
Country: Italy · Model: VARIAC
VARIAC variable autotransformers change the output voltage smoothly from zero to the mains voltage and above, with toroidal models made up to 50 kVA and column models up to 500 kVA and more. They are installed on test benches, in laboratories, control panels, rectifiers and stabilisers.
- Toroidal
- up to 50 kVA
- Column
- up to 500 kVA and more
- Version
- single- and three-phase
- Input frequency
- 50–400 Hz
Technical specifications
| Toroidal | up to 50 kVA |
|---|---|
| Column | up to 500 kVA and more |
| Version | single- and three-phase |
| Input frequency | 50–400 Hz |
| Regulation | manual (knob with scale) or motorised (AC 230 V, DC 24/12 V) |
| Drive control | buttons, RVP-600 board (0–10 V, 4–20 mA, potentiometer), ±1 % stabilisation |
| Standard | IEC 61558-2-14 |
Replacement for
LATR-1M, LATR-2M, RNO-250-2, RNO-250-5, RNO-250-10, RNT (voltage regulators)
selected by purpose and main parameters, please confirm with the manager
Specifications are taken from the manufacturer’s technical documentation. Updated .
Description
The manufacturer variators have been made since 1946, and the principle has stayed simple: a current collector slides along a cleaned track of the winding and picks off the required number of turns. The output sine wave is not distorted, because voltage is regulated by transformer action and not by semiconductor switches. There are single-phase and three-phase versions with an input frequency of 50–400 Hz, so the variator is also suitable for higher-frequency bench supplies. The manual version has a knob with a scale, and the motorised version gets a drive on AC 230 V or DC 24/12 V. The drive is controlled by buttons or by the RVP-600 board, which accepts a 0–10 V or 4–20 mA signal or a potentiometer and in stabilisation mode holds the output to ±1 %. The design complies with IEC 61558-2-14, the safety standard for variable transformers.
How to choose
First determine the load power, because a toroidal variator is sufficient up to 50 kVA, and above that a column variator is taken, available up to 500 kVA and more. Then choose the number of phases and the control method: a knob for a bench with an operator, or a motorised drive for automation and remote setting with a 0–10 V or 4–20 mA signal. If you need a ready-made cabinet with ranges of 0–400 V or 0–690 V and protection up to IP54, look at the Voltage Regulation Set, while column units for your own machine are supplied separately as Voltage Columns.
Request a price and lead time
VARIAC — variable autotransformers, toroidal up to 50 kVA and column up to 500 kVA. We reply within one business day.
Or email office@usk.ua or call +38 (044) 339-50-20.
FAQ
What is the maximum power of VARIAC variators?
Toroidal models are made up to 50 kVA and column models up to 500 kVA and more, in single- and three-phase versions.
Can VARIAC be used at 400 Hz?
Yes, the input frequency is allowed within 50–400 Hz, so the variator works both from a 50 Hz grid and from 400 Hz bench sources.
How is a motorised variator controlled from a PLC?
The RVP-600 board accepts a 0–10 V or 4–20 mA signal, and a potentiometer or buttons can also be connected. The drive is powered from AC 230 V or DC 24/12 V.
Can a VARIAC variator work as a voltage stabiliser?
Yes, with the RVP-600 board a motorised variator holds the output voltage to ±1 %.
Which standard do VARIAC variators comply with?
The variable autotransformers are made to IEC 61558-2-14, the safety standard for variable transformers.
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