# Siemens SIRIUS 3UG5511-1BR20 Phase Sequence Monitoring Relay, 3-Phase 160-690V AC, 50-60Hz, 2CO Contacts

**URL:** https://aio.lv/en/product--siemens-3ug5511-1br20--12458973
**Data updated:** 2026-05-18 09:30 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5511-1BR20
**EAN:** 4047621099828
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 100.99 €
**Prices and availability valid until:** 2026-08-02 23:59
**Price without VAT (21%):** 83.46 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5511-1br20--12458973

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 22.07.2026 | free |
| Pickup points | 27.07.2026 | 1.89 EUR |
| Courier delivery to door | 27.07.2026 | 4.99 EUR |

## Summary description

The Siemens SIRIUS 3UG5511-1BR20 is a professional phase sequence monitoring relay designed for industrial electrical systems. It operates within a 3-phase voltage range of 160-690V AC at 50-60Hz frequencies. Equipped with 2 changeover (2CO) contacts, this device ensures reliable protection by monitoring phase sequence and failure, providing critical safety and operational stability for motors and sensitive electrical equipment.

## Long description

The Siemens SIRIUS 3UG5511-1BR20 is a high-precision phase sequence monitoring relay engineered for industrial electrical applications. This device is designed to monitor 3-phase networks within a voltage range of 160-690V AC and a frequency range of 15-70Hz. By continuously checking for phase sequence, phase failure, and phase asymmetry, it provides essential protection for motors and sensitive electrical equipment, ensuring operational stability and preventing damage caused by incorrect power supply conditions.
Advantages
This monitoring relay offers a compact design that saves valuable space within control cabinets. It features a wide voltage range, allowing for global application without the need for auxiliary voltage. The device is equipped with 2 changeover (2CO) contacts for versatile switching configurations. Its robust construction and international certifications ensure reliability in demanding environments, while the removable terminals facilitate easy installation and maintenance.
Suitable for
Monitoring mobile systems such as air conditioning compressors
Refrigerated containers and transport cooling units
Construction site machinery and industrial cranes
Photovoltaic systems and wind turbine installations
General industrial motor protection
This relay may not be suitable for single-phase electrical systems or applications requiring monitoring of parameters other than phase sequence, phase failure, or asymmetry. It is not intended for use in environments exceeding the specified voltage or frequency limits.
Key specifications
Operating voltage: 3-phase 160-690V AC
Frequency range: 15-70Hz
Output contacts: 2 changeover (2CO) contacts
Connection type: Screw terminals
Functionality: Phase sequence, phase failure, and phase asymmetry monitoring
Installation should be performed by qualified personnel in accordance with local electrical regulations. The device is mounted on a standard DIN rail within a control cabinet. Ensure that the supply voltage matches the specified range before connecting the phase inputs to the relay terminals. The output contacts should be wired into the control circuit of the equipment being protected to trigger a shutdown or alarm upon fault detection.
What to consider before purchase
Verify that your system voltage falls within the 160-690V AC range
Ensure the frequency of your power supply is between 15Hz and 70Hz
Check if the 2CO contact configuration meets your control circuit requirements
Confirm that the screw terminal connection type is compatible with your existing wiring standards
Usage recommendations: Regularly inspect the relay for signs of wear or loose connections. Ensure the device is kept free of dust and moisture within the control cabinet to maintain optimal performance and longevity.

## FAQ

### How much does the Siemens SIRIUS 3UG5511-1BR20 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 22.07.2026 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 3UG5511-1BR20 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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