# Siemens 3UG5511-2AR20 Phase Sequence Monitoring Relay, 3-Phase, 160-690V AC, 50-60Hz, 1 CO Contact

**URL:** https://aio.lv/en/product--siemens-3ug5511-2ar20--12467967
**Data updated:** 2026-05-18 09:29 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5511-2AR20
**EAN:** 4047621099811
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 90.99 €
**Prices and availability valid until:** 2026-08-01 23:59
**Price without VAT (21%):** 75.20 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5511-2ar20--12467967

## 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 3UG5511-2AR20 is a professional phase sequence monitoring relay from the SIRIUS series. Designed for 3-phase systems, it operates within a voltage range of 160-690V AC and a frequency of 50-60Hz. Featuring a 1 CO (changeover) contact and spring-loaded terminals, this device ensures reliable protection and monitoring of electrical installations by detecting phase sequence errors, enhancing operational safety in industrial applications.

## Long description

The Siemens 3UG5511-2AR20 is a professional-grade phase sequence monitoring relay from the SIRIUS series, engineered to provide reliable protection for 3-phase electrical systems. This device is designed to monitor critical parameters such as phase sequence, phase failure, and phase asymmetry, ensuring the integrity and safety of industrial electrical installations. It operates across a broad voltage range of 160-690V AC and a frequency range of 15-70Hz, making it a versatile solution for various global power grid configurations.
Advantages
This monitoring relay offers significant benefits for industrial automation and power management. Its compact, slim design helps optimize space within control cabinets, allowing for more efficient panel layouts. The inclusion of spring-loaded terminals facilitates fast, maintenance-free, and vibration-proof connections, which is particularly beneficial in environments subject to mechanical stress. Furthermore, the device does not require an auxiliary voltage supply, simplifying installation and reducing wiring complexity. With its international certifications, it is suitable for deployment in diverse global markets.
Suitable for
Monitoring phase sequence in mobile systems like A/C compressors and refrigerated containers
Protection of construction site compressors and cranes
Monitoring electrical parameters in photovoltaic systems and wind turbines
General industrial 3-phase power distribution networks
When it may not be suitable
This relay is specifically designed for 3-phase AC systems and is not compatible with single-phase applications or DC power circuits. It should not be used in environments where the voltage or frequency levels exceed the specified operating range of 160-690V AC and 15-70Hz.
Key specifications
Operating voltage: 160-690V AC
Frequency range: 15-70Hz
Monitoring functions: Phase sequence, phase failure, phase asymmetry
Output contact: 1 changeover (CO) contact
Connection type: Spring-loaded terminals
Series: SIRIUS 3UG5
How to use
The relay is designed for mounting within a control cabinet. Begin by ensuring the power supply is disconnected before installation. Connect the 3-phase lines to the designated input terminals. The spring-loaded terminals allow for quick insertion of conductors without the need for specialized tools. Once wired, the device automatically monitors the incoming phases. If a phase sequence error, failure, or asymmetry is detected, the internal changeover contact will switch, allowing the system to trigger an alarm or disconnect the load to prevent damage.
What to consider before purchase
Verify that your system voltage and frequency fall within the 160-690V AC and 15-70Hz range.
Ensure that the 1 CO contact configuration meets your control circuit requirements.
Check if your installation environment requires vibration-proof connections, which are supported by the spring-loaded terminal design.
Confirm that the device dimensions are compatible with your existing control cabinet space.
Usage recommendations: Regularly inspect the terminal connections to ensure they remain secure, especially in high-vibration environments. Ensure that the device is installed in a location protected from excessive moisture, dust, and extreme temperatures to maintain optimal performance and longevity.

## FAQ

### How much does the Siemens 3UG5511-2AR20 Phase Sequence Monitoring Relay cost, and is it available for purchase?

The price is 90.99 € (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 3UG5511-2AR20 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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