# Voltage monitor ONLINE USV-Systeme ONLSW230 — 230V 50Hz mains voltage monitoring device

**URL:** https://aio.lv/en/product--online-usv-systeme-onlsw230--10652566
**Data updated:** 2026-02-12 22:02 (EET)
**Category:** UPS
**Manufacturer:** ONLINE USV-Systeme
**Manufacturer code:** ONLSW230
**EAN:** 4026908004304
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 25.99 €
**Prices and availability valid until:** 2026-07-21 23:59
**Price without VAT (21%):** 21.48 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--online-usv-systeme-onlsw230--10652566

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

The ONLINE USV-Systeme ONLSW230 is a voltage monitor designed for 230V 50Hz mains. It provides continuous monitoring of supply voltage levels and supports detection of under-voltage, over-voltage and power interruptions. Intended for use with UPS systems, industrial equipment and sensitive electronics, it helps prevent damage and downtime by alerting or triggering protective actions.

## Long description

The ONLINE USV-Systeme ONLSW230 — 230V 50Hz mains voltage monitoring device continuously monitors the quality of single-phase mains supply at 230 V and 50 Hz. It detects under-voltage, over-voltage and power interruptions and provides a stable signal for alarm systems or uninterruptible power supplies (UPS). The device is intended for installation where stable mains voltage is required to protect sensitive electronics, industrial controllers and critical infrastructure from supply anomalies and unexpected outages.
Advantages
The voltage monitor offers continuous detection of voltage deviations and interruptions, enabling timely responses from connected protective equipment. Its compact design allows for easy integration into existing electrical installations and UPS setups without occupying significant space. The unit delivers reliable signal outputs that can be used to trigger alarms, initiate UPS transfer or shut down connected loads to prevent equipment damage.
Suitable for
Integration with UPS systems to coordinate transfer to battery power
Protection of servers, network hardware and telecommunications equipment
Monitoring of industrial control panels and PLC-driven machinery
Use in medical and laboratory equipment environments where supply integrity matters
Facility management systems for automated alerting of power anomalies
Key specifications
Nominal input voltage: 230 V AC
Nominal frequency: 50 Hz
Monitored conditions: under-voltage, over-voltage and power interruption detection
Signal outputs: relay/contact outputs for alarm and control functions
Mounting: panel or DIN-rail compatible form factor for electrical cabinets
Operating environment: intended for indoor electrical installations
How to use
Install the unit in the electrical distribution cabinet close to the supply feed and connect the input to the 230 V AC supply according to the wiring instructions. Connect the relay or contact outputs to the UPS control input, alarm system or to a device that will execute protective actions such as load disconnect or orderly shutdown. Configure the connected systems to respond to the monitor’s signal thresholds so that transfer to backup power or alerts occur at the desired voltage limits. Verify wiring and test operation under controlled conditions before placing the system into regular service.
Usage recommendations
Place the device in a dry, ventilated enclosure and ensure connections are tightened per local electrical codes. Periodically test the monitor and connected protective equipment to confirm correct detection and response to under-voltage, over-voltage and interruptions. Coordinate threshold settings and response logic with your UPS or control system to avoid unnecessary transfers or shutdowns while ensuring timely protection.

## FAQ

### How much does the Voltage monitor ONLINE ONLSW230 230V 50Hz cost, and is it available for purchase?

The price is 25.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 36 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 16.07.2026 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. All transactions are 100% secure and encrypted.

### 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 ONLINE USV-Systeme 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 ONLINE USV-Systeme 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/10652566/68535360_large.webp