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

**URL:** https://aio.lv/en/product--siemens-3ug5618-2cr20--12457173
**Data updated:** 2026-05-18 09:30 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5618-2CR20
**EAN:** 4047621099972
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 209.49 €
**Prices and availability valid until:** 2026-07-25 23:59
**Price without VAT (21%):** 173.13 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5618-2cr20--12457173

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The Siemens SIRIUS 3UG5618-2CR20 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 2 changeover contacts (2CO) and spring-loaded terminals, this device provides reliable phase sequence monitoring and voltage protection for industrial electrical installations, ensuring operational safety and equipment longevity.

## Long description

The Siemens SIRIUS 3UG5618-2CR20 is a high-precision digital voltage monitoring relay engineered for the reliable protection of 3-phase electrical systems. This versatile device is designed to monitor critical parameters including phase sequence, phase failure, phase asymmetry, frequency, as well as overvoltage and undervoltage conditions. With a wide operating range of 90 to 690V AC and a frequency range of 15 to 70Hz, it is suitable for diverse industrial environments, ensuring that sensitive equipment remains protected against power fluctuations and grid instabilities.
Advantages
This monitoring relay offers significant operational benefits, including a compact design that saves valuable space within control cabinets. The digital interface allows for precise parameterization of monitoring functions, such as window monitoring or overshoot and undershoot thresholds, providing users with granular control over their electrical systems. The inclusion of a clear display for actual values and fault diagnostics facilitates rapid troubleshooting and maintenance. Furthermore, the device features spring-loaded terminals, which ensure a vibration-proof, maintenance-free connection, making it ideal for demanding industrial applications where reliability is paramount.
Suitable for
Industrial 3-phase electrical installations
Mobile systems such as air conditioning compressors and refrigerated containers
Construction site machinery and cranes
Photovoltaic systems and wind turbine power management
Applications requiring phase sequence correction
When it may not be suitable
This device is specifically designed for 3-phase AC systems and is not intended for use in single-phase DC applications. It may not be suitable for environments where the required voltage or frequency levels fall outside the specified 90-690V AC and 15-70Hz ranges.
Key specifications
Voltage range: 90-690V AC
Frequency range: 15-70Hz
Contacts: 2 changeover contacts (2CO)
Connection type: Spring-loaded terminals
Monitoring functions: Phase sequence, phase failure, asymmetry, frequency, overvoltage, undervoltage
How to use
The relay is mounted within a control cabinet and connected to the 3-phase supply lines. Once installed, the digital interface is used to configure the desired monitoring thresholds, delay times, and reset behavior according to the specific requirements of the connected equipment. The display provides real-time feedback on the actual voltage and frequency values, allowing for accurate calibration. The spring-loaded terminals allow for quick wiring without the need for frequent retightening, ensuring a secure connection even in high-vibration environments.
What to consider before purchase
Verify that the supply voltage and frequency of your system fall within the 90-690V AC and 15-70Hz range.
Ensure the control cabinet has sufficient space for the device dimensions.
Confirm that the 2CO contact configuration meets the requirements of your control circuit.
Check if your application requires specific safety certifications such as SIL or PL ratings.
Usage recommendations: Regularly monitor the device display for any indicated power system faults to ensure proactive maintenance. Ensure that all wiring is performed by qualified personnel in accordance with local electrical standards to maintain the integrity of the vibration-proof spring-loaded connections.

## FAQ

### How much does the Siemens SIRIUS 3UG5618-2CR20 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 — 1 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 14.07.2026 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 3UG5618-2CR20 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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