# Siemens 3UG5511-1AR20 Phase Sequence Monitoring Relay 3x160-690V AC 50-60Hz 1CO

**URL:** https://aio.lv/en/product--siemens-3ug5511-1ar20--12447202
**Data updated:** 2026-05-18 02:43 (EEST)
**Category:** Control Systems
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5511-1AR20
**EAN:** 4047621099804
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 90.99 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 75.20 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5511-1ar20--12447202

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Pickup points | 21.07.2026 | 1.89 EUR |
| Courier delivery to door | 21.07.2026 | 4.99 EUR |

## Summary description

The Siemens 3UG5511-1AR20 is a professional phase sequence monitoring relay designed for industrial electrical systems. It operates within a voltage range of 3x160-690V AC at 50-60Hz and features one changeover contact (1CO). This SIRIUS series device ensures reliable protection by monitoring phase sequence, making it essential for preventing damage to motors and sensitive equipment in various automation and power distribution applications.

## Long description

The Siemens 3UG5511-1AR20 is a high-performance phase sequence monitoring relay from the SIRIUS series, engineered for precise electrical network supervision in industrial environments. This device is specifically designed to monitor phase sequence, phase failure, and phase asymmetry, providing critical protection for motors and sensitive electrical equipment. By ensuring that the power supply parameters remain within safe operating limits, it helps prevent mechanical damage and operational downtime in complex automation systems.
Advantages
This monitoring relay offers significant operational benefits, including a wide voltage range that allows for versatile application across various international power grids without the need for auxiliary voltage. Its slim, compact design optimizes space within control cabinets, making it an ideal choice for modern electrical installations. The inclusion of removable screw terminals facilitates easy installation and maintenance, while the robust construction ensures reliable performance in demanding environments. Furthermore, the device is built to meet global standards, ensuring compatibility and safety for diverse industrial projects.
Suitable for
Mobile systems such as air conditioning compressors and refrigerated containers
Construction site machinery and industrial cranes
Photovoltaic systems and wind turbine installations
General power distribution and motor control applications
This relay may not be suitable for applications requiring monitoring of DC power supplies, as it is specifically designed for AC networks. Additionally, it is not intended for use in environments where the voltage or frequency exceeds the specified operating range of 3x160-690V AC and 15-70Hz.
Key specifications
Operating voltage range: 3x160-690V AC
Frequency range: 15-70Hz
Output: 1 changeover contact (1CO)
Connection type: Screw terminals
Monitoring functions: Phase sequence, phase failure, and phase asymmetry
The device is installed within a control cabinet, typically mounted on a standard DIN rail. Connections are made via the provided screw terminals, ensuring a secure and vibration-resistant link to the electrical circuit. Once installed, the relay automatically monitors the incoming power supply. If the phase sequence is incorrect or if a phase failure or asymmetry is detected, the internal changeover contact triggers, allowing the system to disconnect the load or signal an alarm to prevent equipment damage.
What to consider before purchase
Verify that your system voltage and frequency fall within the specified 160-690V AC and 15-70Hz range.
Ensure that the 1CO contact configuration meets your specific control circuit requirements.
Check available space in your control cabinet to accommodate the relay dimensions.
Confirm that screw terminals are appropriate for your wiring standards and vibration requirements.
Ensure that all electrical installations are performed by qualified personnel in accordance with local safety regulations. Regularly inspect the relay and terminal connections to maintain optimal performance and safety in your electrical system.

## FAQ

### How much does the Siemens 3UG5511-1AR20 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 — 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 16.07.2026 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 3UG5511-1AR20 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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