# Siemens SIRIUS 3UG5514-2BR20 Phase Monitoring Relay, 3-Phase, 160-690V AC, 2CO Contacts

**URL:** https://aio.lv/en/product--siemens-3ug5514-2br20--12471780
**Data updated:** 2026-05-18 09:43 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5514-2BR20
**EAN:** 4047621099934
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 138.99 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 114.87 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5514-2br20--12471780

## 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 3UG5514-2BR20 is a high-precision phase monitoring relay designed for 3-phase networks. It monitors phase failure, phase sequence, asymmetry, and undervoltage within a range of 160-690V AC and 15-70Hz. Equipped with 2CO contacts and spring-loaded terminals, this device ensures reliable protection for industrial electrical systems by detecting supply faults and preventing equipment damage.

## Long description

The Siemens SIRIUS 3UG5514-2BR20 is a high-precision phase monitoring relay engineered for reliable 3-phase network supervision. This device is designed to detect critical electrical faults, including phase failure, incorrect phase sequence, phase asymmetry, and undervoltage conditions. Operating within a wide voltage range of 160-690V AC and a frequency range of 15-70Hz, it provides essential protection for industrial equipment and sensitive electrical systems. Its compact design and spring-loaded terminals facilitate efficient installation in control cabinets, ensuring a vibration-proof and maintenance-free connection.
Advantages
This monitoring relay offers significant benefits for industrial applications by providing comprehensive protection against supply faults that could otherwise lead to equipment damage or operational downtime. The device features analog adjustment capabilities, allowing for precise configuration according to specific system requirements. Its wide voltage range ensures versatility, making it suitable for global deployment across various network configurations without the need for auxiliary voltage. The inclusion of spring-loaded terminals not only speeds up the installation process but also ensures long-term reliability in environments subject to vibration.
Suitable for
Monitoring mobile systems such as A/C compressors and refrigerated containers
Protection of construction site compressors and heavy-duty cranes
Supervision of photovoltaic systems and wind turbine installations
General industrial 3-phase electrical network monitoring
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 not be suitable for environments where the required monitoring parameters fall outside the specified 160-690V AC or 15-70Hz frequency ranges.
Key specifications
Monitoring functions: Phase failure, phase sequence, asymmetry, and undervoltage
Voltage range: 3x 160-690V AC
Frequency range: 15-70Hz
Output contacts: 2 changeover (2CO) contacts
Connection type: Spring-loaded terminals
Design: Slim profile for space-saving installation
How to use
The relay should be installed within a control cabinet on a standard mounting rail. Connect the 3-phase supply lines to the designated input terminals. Use the analog adjustment dials on the front of the device to set the required monitoring thresholds for asymmetry and undervoltage. Ensure that the wiring is secure and that the device is properly integrated into the control circuit via the 2CO output contacts. Once powered, the relay will continuously monitor the supply and trigger the output contacts if a fault condition is detected.
What to consider before purchase
Verify that your network voltage and frequency fall within the supported ranges
Ensure the 2CO contact configuration meets your control circuit requirements
Check available space in your control cabinet for the slim-profile housing
Confirm that spring-loaded terminals are compatible with your existing wiring standards
Usage recommendations
For optimal performance and safety, ensure that all electrical connections are performed by qualified personnel in accordance with local regulations. Regularly inspect the terminals for tightness and verify the relay settings during routine maintenance cycles to ensure continued protection of your equipment.

## FAQ

### How much does the Siemens SIRIUS 3UG5514-2BR20 Phase Monitoring Relay cost, and is it available for purchase?

The price is 138.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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 3UG5514-2BR20 Phase 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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