# Siemens SIRIUS 3UG5616-1CR20 Digital Voltage Monitoring Relay, 3-Phase, 90-690V AC, 15-70Hz, 2CO

**URL:** https://aio.lv/en/product--siemens-3ug5616-1cr20--12473534
**Data updated:** 2026-05-18 09:29 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5616-1CR20
**EAN:** 4047621099941
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 186.49 €
**Prices and availability valid until:** 2026-07-27 23:59
**Price without VAT (21%):** 154.12 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5616-1cr20--12473534

## 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 Siemens SIRIUS 3UG5616-1CR20 is a digital monitoring relay designed for 3-phase networks. It provides comprehensive protection by monitoring phase failure, phase sequence, asymmetry, and over/under voltage. Featuring a wide operating range of 90-690V AC and 15-70Hz frequency, it includes two changeover contacts (2CO) and reliable screw terminals. Ideal for industrial automation and electrical safety applications requiring precise monitoring of power supply parameters.

## Long description

The Siemens SIRIUS 3UG5616-1CR20 is a high-precision digital voltage monitoring relay engineered for reliable 3-phase network supervision. This device provides comprehensive protection by continuously monitoring for phase failure, incorrect phase sequence, phase asymmetry, frequency fluctuations, as well as over-voltage and under-voltage conditions. Designed for versatility, it operates across a wide voltage range of 90-690V AC and a frequency range of 15-70Hz, making it suitable for global industrial applications.
Advantages
This monitoring relay offers significant flexibility through its digitally adjustable settings, allowing users to configure overshoot, undershoot, or window monitoring modes with ease. The inclusion of a clear display for actual values and fault types ensures rapid diagnostics and reduced downtime. Its compact design optimizes control cabinet space, while the use of robust screw terminals ensures a secure and reliable electrical connection. Furthermore, the device supports customizable delay times and reset behaviors, providing tailored protection for sensitive equipment in unstable power environments.
Suitable for
Industrial automation systems
Refrigerated containers and A/C compressors
Construction site compressors and cranes
Photovoltaic systems and wind turbines
Mobile power systems
When it may not be suitable
This device is specifically designed for 3-phase AC networks and is not intended for use in single-phase applications or DC power systems. It may also not be suitable for environments where extreme vibration exceeds the mechanical specifications of standard screw terminals, in which case spring-loaded terminal alternatives should be considered.
Key specifications
Monitoring functions: Phase failure, phase sequence, asymmetry, over/under voltage, and frequency
Operating voltage range: 3x 90-690V AC
Frequency range: 15-70Hz
Output contacts: 2 changeover contacts (2CO)
Connection type: Screw terminals
How to use
The relay is mounted within a control cabinet to monitor the incoming power supply. Once installed, the digital interface allows for the configuration of specific threshold values for voltage and frequency, as well as the setting of desired time delays for fault response. The display provides real-time feedback on the power system status, allowing operators to verify that the parameters are within the safe operating limits for the connected machinery.
What to consider before purchase
Ensure the supply voltage and frequency of your application fall within the 90-690V AC and 15-70Hz range.
Verify that the 2CO contact configuration meets your control circuit requirements.
Confirm that the physical dimensions fit your existing control cabinet layout.
Usage recommendations: Regularly check the display for any logged fault codes to ensure the power system remains stable. Ensure that all screw terminals are tightened to the manufacturer's specified torque to maintain a vibration-proof connection.

## FAQ

### How much does the Siemens SIRIUS 3UG5616-1CR20 Voltage Monitoring Relay cost, and is it available for purchase?

The price is 186.49 € (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 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, Installment. All transactions are 100% secure and encrypted.

### Can Siemens SIRIUS 3UG5616-1CR20 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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