# Siemens 3RQ4018-1AF00 Output Coupler, AC/DC 230V, 1CO Contact, Screw Terminals

**URL:** https://aio.lv/en/product--siemens-3rq4018-1af00--12469040
**Data updated:** 2026-05-18 09:43 (EEST)
**Category:** Control Systems
**Manufacturer:** Siemens
**Manufacturer code:** 3RQ4018-1AF00
**EAN:** 4047621118529
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 34.49 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 28.50 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-3rq4018-1af00--12469040

## 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 3RQ4018-1AF00 is a compact output coupler designed for reliable signal isolation and switching. It operates at 230V AC/DC and features a single changeover (1CO) contact with a 6A thermal current rating. With a slim 6.2mm width and secure screw terminal connections, this relay is ideal for industrial automation systems requiring efficient space utilization and robust electrical performance.

## Long description

The Siemens 3RQ4018-1AF00 output coupler is a high-performance industrial relay designed for reliable signal isolation and switching in automation systems. This compact device integrates a relay within a slim 6.2 mm housing, making it an excellent choice for control cabinets where space is at a premium. It operates on a 230V AC/DC supply and features a single changeover (1CO) contact, ensuring versatile switching capabilities for various electrical loads.
Advantages
The primary benefit of this output coupler is its space-saving design, which allows for high-density mounting in control panels without compromising performance. The integrated relay design simplifies installation and maintenance, while the robust screw terminals provide a secure and vibration-resistant connection. Its ability to handle a thermal current of 6 A makes it suitable for a wide range of standard industrial switching tasks, providing consistent electrical isolation between control circuits and power circuits.
Suitable for
Industrial automation and control systems
Signal isolation between PLC outputs and field devices
Switching small to medium electrical loads
Space-constrained control cabinet applications
When it may not be suitable
This device is not intended for high-power switching applications that exceed its 6 A thermal current rating. It is also not suitable for environments requiring specialized hazardous area protection or for applications where a higher number of contacts or specific safety-rated switching logic is required.
Key specifications
Operating voltage: 230V AC/DC
Contact configuration: 1 changeover (1CO) contact
Thermal current: 6 A
Connection type: Screw terminals
Width: 6.2 mm
How to use
To install the output coupler, mount it onto a standard DIN rail within your control cabinet. Connect the control signal wires to the input terminals and the load circuit wires to the output screw terminals, ensuring that all connections are tightened according to the specified torque requirements. Verify that the supply voltage matches the 230V AC/DC rating before energizing the circuit to prevent damage to the device or connected components.
What to consider before purchase
Verify that the 230V AC/DC control voltage matches your system requirements.
Ensure the 6 A thermal current rating is sufficient for your specific load.
Confirm that the 6.2 mm width fits your current DIN rail layout.
Check that your wiring setup is compatible with screw terminal connections.
Usage recommendations
Always ensure that the power supply is disconnected before performing any wiring or maintenance tasks. Regularly inspect the screw terminals for tightness to maintain optimal electrical contact and prevent overheating during prolonged operation.

## FAQ

### How much does the Siemens 3RQ4018-1AF00 Output Coupler cost, and is it available for purchase?

The price is 34.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 12 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. All transactions are 100% secure and encrypted.

### 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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