# Siemens SIRIUS 3UG5512-1AR20 Phase Monitoring Relay, 3-Phase, 160-690V AC, 1 CO Contact

**URL:** https://aio.lv/en/product--siemens-3ug5512-1ar20--12452587
**Data updated:** 2026-05-18 02:38 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** Siemens
**Manufacturer code:** 3UG5512-1AR20
**EAN:** 4047621099842
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 97.99 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 80.98 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3ug5512-1ar20--12452587

## 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 SIRIUS 3UG5512-1AR20 is a professional phase monitoring relay designed for 3-phase networks. It monitors phase sequence, phase failure, and asymmetry within a voltage range of 160-690V AC and a frequency of 15-70Hz. Equipped with one changeover (CO) contact and reliable screw terminals, this device ensures operational safety and protects industrial equipment from electrical faults. Ideal for monitoring power supply stability in control cabinets and automation systems.

## Long description

The Siemens SIRIUS 3UG5512-1AR20 is a high-performance phase monitoring relay engineered for the precise supervision of 3-phase electrical networks. This device provides comprehensive protection by continuously monitoring for phase sequence, phase failure, and phase asymmetry. Designed to operate within a wide voltage range of 160-690V AC and a frequency spectrum of 15-70Hz, it ensures that industrial equipment remains protected against electrical irregularities that could lead to operational downtime or hardware damage.
Advantages
This monitoring relay offers significant operational benefits, including a compact design that saves valuable space within control cabinets. Its ability to function without auxiliary voltage across a wide range of network voltages makes it a versatile solution for global applications. The device is built for reliability, featuring robust screw terminals that ensure secure connections. Furthermore, the unit is designed to be part of a standardized ecosystem, allowing for easy integration with various accessories such as labeling plates and sealing covers, while maintaining compatibility with international safety standards.
Suitable for
Monitoring power supply stability in industrial control cabinets
Protection of mobile systems such as air conditioning compressors and refrigerated containers
Safety monitoring for construction site compressors and heavy-duty cranes
Electrical fault detection in photovoltaic systems and wind turbines
When it may not be suitable
This device is specifically designed for 3-phase AC networks and is not intended for use in single-phase applications or DC power systems. It may also not be suitable for environments where the electrical noise exceeds the electromagnetic compatibility specifications of the relay.
Key specifications
Monitoring functions: Phase sequence, phase failure, and phase asymmetry
Voltage range: 3x 160-690V AC
Frequency range: 15-70Hz
Output: 1 changeover (CO) contact
Connection type: Screw terminals
How to use
Installation should be performed by qualified personnel in accordance with local electrical regulations. The relay is designed for mounting within a control cabinet, typically on a standard DIN rail. Connect the three phases of the power supply to the designated input terminals on the device. Ensure that the wiring is tightened securely to the screw terminals to prevent loose connections. Once installed, the device automatically begins monitoring the network parameters. The changeover contact can be wired into the control circuit of a contactor or PLC to trigger a shutdown or alarm if a fault condition is detected.
What to consider before purchase
Verify that your network voltage falls within the 160-690V AC range
Ensure the application requires 3-phase monitoring
Confirm that screw terminals are compatible with your existing wiring standards
Check if additional accessories like sealing covers are required for your specific installation environment
Usage recommendations: Regularly inspect the terminal connections for tightness, especially in environments subject to vibration. Ensure that the device is kept free from dust and moisture to maintain optimal performance and longevity.

## FAQ

### How much does the Siemens SIRIUS 3UG5512-1AR20 Phase Monitoring Relay cost, and is it available for purchase?

The price is 97.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 3 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 SIRIUS 3UG5512-1AR20 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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