# Siemens SIRIUS 3UG5514-1BR20 Phase Monitoring Relay, 3-Phase, 160-690V AC, 15-70Hz, 2CO Contacts

**URL:** https://aio.lv/en/product--siemens-3ug5514-1br20--12447696
**Data updated:** 2026-05-18 02:47 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5514-1BR20
**EAN:** 4047621099927
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 138.99 €
**Prices and availability valid until:** 2026-07-22 23:59
**Price without VAT (21%):** 114.87 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5514-1br20--12447696

## 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 3UG5514-1BR20 is a professional monitoring relay designed for 3-phase networks. It provides reliable protection against phase failure, incorrect phase sequence, and voltage asymmetry. Operating within a voltage range of 160-690V AC and a frequency of 15-70Hz, it features two changeover (2CO) contacts and screw terminals. This device is essential for industrial automation and motor protection applications requiring precise electrical monitoring.

## Long description

The Siemens SIRIUS 3UG5514-1BR20 is a high-precision phase monitoring relay engineered for the reliable supervision of 3-phase electrical networks. This device is designed to detect critical power anomalies, including phase failure, incorrect phase sequence, phase asymmetry, and undervoltage conditions. By continuously monitoring these parameters, the relay helps prevent damage to sensitive industrial equipment and ensures the stability of electrical systems across a wide operating voltage range of 160-690V AC and a frequency range of 15-70Hz.
Advantages
This monitoring relay offers significant benefits for industrial automation and infrastructure management. Its compact, slim design optimizes space within control cabinets, making it an ideal choice for modern electrical installations. The device features analog adjustment capabilities, allowing for precise configuration to meet specific operational requirements. Furthermore, it is built for global versatility, supported by international certifications that allow for deployment in diverse geographic regions. The inclusion of two changeover (2CO) contacts provides flexible switching options for various control circuits, while the robust screw terminals ensure a secure and durable electrical connection.
Suitable for
Monitoring mobile systems such as air conditioning compressors and refrigerated containers
Protection of construction site compressors and heavy-duty cranes
Electrical supervision in photovoltaic systems and wind turbines
General industrial motor protection and network monitoring
This relay may not be suitable for applications requiring DC voltage monitoring, as it is specifically designed for 3-phase AC networks. Additionally, it should not be used in environments where the electrical noise or vibration levels exceed the specified technical ratings of the device, as this could lead to false tripping or premature wear.
Key specifications
Operating voltage: 3-phase 160-690V AC
Frequency range: 15-70Hz
Monitoring functions: Phase failure, phase sequence, phase asymmetry, and undervoltage
Output contacts: 2 changeover (2CO) contacts
Connection type: Screw terminals
Design: Slim profile for space-saving cabinet mounting
Installation should be performed by qualified personnel in accordance with local electrical regulations. The relay is mounted on a standard DIN rail within a control cabinet. After mounting, the desired monitoring parameters are set using the analog controls on the front of the device. Once configured, the input phases are connected to the designated terminals, and the output contacts are integrated into the control circuit to trigger an alarm or shut down the system in the event of a fault.
What to consider before purchase
Verify that the supply voltage of your 3-phase network falls within the 160-690V AC range
Ensure the frequency of your system is between 15-70Hz
Check if your control circuit requires 2CO contacts for your specific logic
Confirm that the screw terminal connection type meets your installation standards
For optimal performance and longevity, it is recommended to periodically inspect the terminal connections for tightness and ensure the device is kept free from excessive dust or moisture within the control cabinet.

## FAQ

### How much does the Siemens SIRIUS 3UG5514-1BR20 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 — 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 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 3UG5514-1BR20 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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