# Siemens SIRIUS 3UG5618-1CR20 Digital Voltage Monitoring Relay, 3-Phase, 90-690V AC, 2CO Contacts

**URL:** https://aio.lv/en/product--siemens-3ug5618-1cr20--12469037
**Data updated:** 2026-05-18 09:43 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5618-1CR20
**EAN:** 4047621099965
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 209.49 €
**Prices and availability valid until:** 2026-08-01 23:59
**Price without VAT (21%):** 173.13 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5618-1cr20--12469037

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.07.2026 | free |
| Pickup points | 27.07.2026 | 1.89 EUR |
| Courier delivery to door | 27.07.2026 | 4.99 EUR |

## Summary description

The Siemens SIRIUS 3UG5618-1CR20 is a digital voltage monitoring relay designed for 3-phase systems. It operates within a voltage range of 90-690V AC and a frequency range of 15-70Hz. Featuring two changeover (2CO) contacts and screw terminals, this device provides reliable phase sequence monitoring and voltage control for industrial automation and electrical protection applications.

## Long description

The Siemens SIRIUS 3UG5618-1CR20 is a high-precision digital voltage monitoring relay engineered for robust 3-phase electrical systems. It provides comprehensive protection by monitoring critical parameters such as phase sequence, phase failure, asymmetry, frequency, as well as overvoltage and undervoltage conditions. Designed for versatility, it operates within a wide voltage range of 90-690V AC and a frequency range of 15-70Hz, making it suitable for global industrial applications where reliable power quality is essential.
Advantages
This monitoring relay offers significant operational benefits, including a slim, space-saving design that optimizes control cabinet layout. The digital interface allows for precise parameterization of delay times and reset behaviors, enabling users to configure the device for overshoot, undershoot, or window monitoring modes. With its integrated display, the unit provides real-time diagnostics by showing actual values and specific power system fault types, which facilitates faster troubleshooting and reduced downtime. The inclusion of two changeover contacts ensures flexible integration into various control circuits, while the wide voltage range and international certifications guarantee compatibility across diverse electrical infrastructures.
Suitable for
Industrial automation and control systems
Mobile power systems such as refrigerated containers and construction site compressors
HVAC equipment and air conditioning compressors
Renewable energy installations including wind turbines and photovoltaic systems
Crane and lifting equipment control panels
When it may not be suitable
This device is specifically designed for 3-phase AC systems and is not intended for use in pure DC power applications. Furthermore, it may not be suitable for environments where extreme vibration exceeds the specifications of standard screw terminals, in which case versions with spring-loaded terminals should be considered.
Key specifications
Voltage range: 90-690V AC
Frequency range: 15-70Hz
Monitoring functions: Phase sequence, phase failure, asymmetry, frequency, overvoltage, undervoltage
Output contacts: 2 changeover (2CO) contacts
Connection type: Screw terminals
Display: Integrated digital display for actual values and fault diagnostics
How to use
The relay is mounted within a control cabinet and wired into the 3-phase power circuit. Once installed, the digital interface is used to set the desired threshold values for voltage and frequency monitoring. Users can configure the device to detect specific fault conditions and define the appropriate delay times for relay activation. The display provides continuous feedback on the status of the network, allowing for immediate identification of phase errors or voltage fluctuations. Periodic checks of the terminal connections are recommended to ensure long-term operational integrity.
What to consider before purchase
Verify that the 3-phase supply voltage falls within the 90-690V AC range.
Confirm if your application requires monitoring with or without a neutral conductor.
Check the available space in your control cabinet to ensure compatibility with the relay dimensions.
Determine if your specific installation environment requires screw terminals or if spring-loaded terminals would be more advantageous for vibration resistance.
Usage recommendations
For optimal performance and safety, ensure that the relay is installed by qualified personnel in accordance with local electrical regulations. Regularly monitor the diagnostic display to proactively identify potential power quality issues before they lead to system failure.

## FAQ

### How much does the Siemens SIRIUS 3UG5618-1CR20 Voltage Monitoring Relay cost, and is it available for purchase?

The price is 209.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 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 22.07.2026 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. All transactions are 100% secure and encrypted.

### Can Siemens SIRIUS 3UG5618-1CR20 Voltage Monitoring Relay 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 Siemens 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 Siemens 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

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