# Siemens SIRIUS 3UG5511-2BR20 Phase Sequence Monitoring Relay, 3x160-690V AC, 50-60Hz, 2CO

**URL:** https://aio.lv/en/product--siemens-3ug5511-2br20--12459020
**Data updated:** 2026-05-18 09:30 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5511-2BR20
**EAN:** 4047621099835
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 100.99 €
**Prices and availability valid until:** 2026-07-20 23:59
**Price without VAT (21%):** 83.46 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5511-2br20--12459020

## 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 3UG5511-2BR20 is a high-precision phase sequence monitoring relay designed for industrial electrical systems. It operates within a voltage range of 3x160-690V AC at 50-60Hz and features 2 changeover (2CO) contacts. This device ensures reliable protection by monitoring phase order, making it an essential component for safeguarding motors and sensitive equipment against phase failure or incorrect sequence in power distribution networks.

## Long description

The Siemens SIRIUS 3UG5511-2BR20 is a high-precision phase sequence monitoring relay engineered for robust performance in industrial electrical environments. This device is specifically designed to monitor phase sequence, phase failure, and phase asymmetry, providing critical protection for motors and sensitive electrical equipment. With its wide operating voltage range of 3x160-690V AC and compatibility with 50-60Hz frequencies, it offers versatile application across various power distribution networks.
Advantages
This monitoring relay stands out due to its compact and slim design, which significantly reduces the space required within control cabinets. It features spring-loaded terminals that ensure a fast, maintenance-free, and vibration-proof connection, making it ideal for demanding industrial settings. The device is designed for global use, supported by international certifications and a wide voltage range that eliminates the need for auxiliary voltage. Furthermore, the modular design includes removable terminals and standardized accessories, ensuring ease of installation and maintenance.
Suitable for
Mobile systems such as air conditioning compressors
Refrigerated containers
Construction site compressors
Cranes and lifting equipment
Photovoltaic systems and wind turbines
When it may not be suitable
This device is intended for specific phase monitoring applications and may not be suitable for systems requiring complex programmable logic control or monitoring of parameters beyond phase sequence, failure, and asymmetry. It should not be used in environments that exceed its specified voltage or frequency ratings.
Key specifications
Operating voltage: 3x160-690V AC
Frequency range: 50-60Hz
Output contacts: 2 changeover (2CO) contacts
Connection type: Spring-loaded terminals
Monitoring functions: Phase sequence, phase failure, phase asymmetry
How to use
The relay is designed for installation within a control cabinet. Begin by ensuring the power supply is disconnected. Mount the device onto a standard DIN rail. Connect the three-phase power lines to the designated input terminals using the spring-loaded connection mechanism, which requires no specialized tools for secure wiring. Once connected, the device automatically monitors the phase parameters. The removable terminals allow for pre-wiring, simplifying the integration process into existing electrical panels.
What to consider before purchase
Verify that your system voltage falls within the 160-690V AC range.
Ensure the frequency of your power network is compatible with the 50-60Hz specification.
Check available space in your control cabinet to accommodate the slim design.
Confirm that the 2CO contact configuration meets your control circuit requirements.
Usage recommendations
For optimal performance and safety, ensure that all connections are made according to the provided wiring diagrams. Regularly inspect the spring-loaded terminals during routine maintenance to ensure they remain free of debris and that the wiring remains secure, especially in high-vibration environments.

## FAQ

### How much does the Siemens SIRIUS 3UG5511-2BR20 Phase Sequence Monitoring Relay cost, and is it available for purchase?

The price is 100.99 € (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 3UG5511-2BR20 Phase Sequence 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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