# Three-phase automatic voltage regulator KEMOT PROavr-25k 25 kVA 400 V

**URL:** https://aio.lv/en/product--kemot-urz3437-25--11082003
**Data updated:** 2026-03-02 15:43 (EET)
**Category:** Voltage Stabilizers
**Manufacturer:** KEMOT
**Manufacturer code:** URZ3437-25
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 819.49 €
**Prices and availability valid until:** 2026-07-24 23:59
**Price without VAT (21%):** 677.26 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--kemot-urz3437-25--11082003

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Courier delivery to door | 08.07.2026 | 53.99 EUR |

## Summary description

Three-phase automatic voltage regulator KEMOT PROavr-25k with 25 kVA rated power and 400 V nominal voltage. Designed to stabilize and protect three-phase electrical installations by automatically correcting input voltage fluctuations. Suitable for commercial and industrial equipment, small workshops, and server rooms where steady voltage is required to prevent damage and reduce downtime.

## Long description

The KEMOT PROavr-25k three-phase automatic voltage regulator provides stabilized 230 V output (single-phase mode) and maintains balanced three-phase output in three-phase mode for installations with a 400 V nominal supply. With a rated power of 25 kVA, the unit is built on a toroidal transformer and servo-based regulation to correct undervoltage or overvoltage and supply a steady output within 230 V ±3% in single-phase operation. The regulator includes phase monitoring, over/under-voltage protection, overload, overheating and short-circuit protection, as well as a bypass switch and adjustable start delay.
Advantages
The stabiliser ensures high output accuracy (up to ±3%) using servo motor technology and a toroidal transformer for stable operation. It supports independent phase operation in single-phase mode and enforces phase balancing in three-phase mode, triggering a "PHASE ERROR" indication and output cut-off if a phase fault is detected. Additional functional features include a bypass switch for direct mains feeding, a DELAY start-up timer (6–180 seconds) to protect against high inrush currents, and a robust wheeled chassis for easier transport and positioning.
Suitable for
Commercial and industrial three-phase equipment
Office devices such as computers, monitors, printers and cash registers
Home appliances with sensitive electronics: refrigerators, freezers, microwave ovens, induction hobs
Audio/video systems, TVs and speakers
Heating pumps and central heating systems
Backup generators and small workshops
Key specifications
Model: KEMOT PROavr-25k (MPN URZ3437-25)
Rated power: 25 kVA
Nominal voltage (three-phase): 400 V
Output voltage accuracy (single-phase): 230 V ±3%
Control method: servo motor with toroidal transformer
Delay start range: 6–180 seconds
Protections: over-voltage, under-voltage, overload, overheating, short-circuit, phase error detection
Features: bypass switch, four transport wheels
How to use
Install the regulator in a dry, ventilated location and connect it to the incoming three-phase supply according to local electrical codes. For three-phase operation, ensure all three input phases are connected and balanced; the unit will monitor each phase and disable output with a phase error if imbalance or disconnection is detected. Use the DELAY selector to set a start delay between 6 and 180 seconds when connecting equipment with high starting currents. The bypass switch can be used to feed mains directly while the stabiliser is isolated for maintenance.
Usage recommendations
For reliable long-term operation, schedule periodic inspections of electrical connections and ventilation paths, avoid exposing the unit to moisture or extreme temperatures, and select an installation location that allows access to the bypass and delay controls. If used with generators, verify compatibility with the generator’s voltage and phase characteristics before continuous operation.

## FAQ

### How much does the KEMOT PROavr-25k 25 kVA 400 V voltage regulator cost, and is it available for purchase?

The price is 819.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 30 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 03.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay, Installment, Leasing for legal entities. All transactions are 100% secure and encrypted.

### Can KEMOT PROavr-25k 25 kVA 400 V voltage regulator be purchased with a lease?

Yes, the purchase is available both on credit and with an interest-free installment plan. Learn more about installments and credit options: https://aio.lv/en/payment#b3

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All KEMOT products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized KEMOT service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/11082003/65883589_large.webp