# Siemens 5TT5840-2 Modular Contactor 40A 4NO 24V AC

**URL:** https://aio.lv/en/product--siemens-5tt58402--1803829
**Data updated:** 2026-05-18 02:44 (EEST)
**Category:** Power Sockets
**Manufacturer:** Siemens
**Manufacturer code:** 5TT58402
**EAN:** 4001869344072
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 133.99 €
**Prices and availability valid until:** 2026-07-28 23:59
**Price without VAT (21%):** 110.74 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--siemens-5tt58402--1803829

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 16.07.2026 | free |
| Courier delivery to door | 21.07.2026 | 53.99 EUR |

## Summary description

The Siemens 5TT5840-2 is a high-quality modular contactor designed for reliable electrical switching in distribution boards. Featuring a 40A current rating and 4 normally open (NO) contacts, it operates on a 24V AC control voltage. This robust device is ideal for industrial and residential electrical installations, ensuring efficient control of lighting, heating, and motor circuits with long-term operational stability.

## Long description

The Siemens 5TT5840-2 modular contactor is a professional-grade switching device engineered for integration into electrical distribution boards. It provides a reliable solution for managing high-current loads, featuring a 40A current rating and four normally open (NO) contacts. Designed for consistent performance, this contactor operates on a 24V AC control voltage, making it a versatile component for various electrical control systems in both residential and industrial environments.
Advantages
This modular contactor stands out due to its robust construction and high operational reliability. It is specifically designed to handle demanding switching tasks while maintaining long-term stability in diverse electrical setups. The compact modular design allows for seamless installation within standard distribution boards, optimizing space while ensuring efficient control over connected circuits. Its high-quality engineering minimizes maintenance requirements and supports consistent performance under continuous load conditions.
Suitable for
Control of lighting systems in commercial and residential buildings
Management of heating and ventilation circuits
Switching of motor circuits in small-scale industrial applications
Integration into automated electrical distribution panels
When it may not be suitable
This device is not intended for use in circuits exceeding its 40A current rating or for applications requiring a different control voltage than the specified 24V AC. It is also not suitable for environments with extreme moisture or corrosive atmospheres without appropriate protective enclosures.
Key specifications
Current rating: 40A
Contact configuration: 4 normally open (NO) contacts
Control voltage: 24V AC
Weight: 0.374 kg
Mounting type: Modular (DIN rail)
How to use
The contactor should be installed by a qualified electrician in accordance with local electrical regulations. It is designed to be mounted on a standard DIN rail within a distribution board. Ensure that the control circuit is connected to the 24V AC terminals and that the load circuit is wired to the appropriate NO contact terminals. Verify all connections for tightness and ensure that the wiring gauge is appropriate for a 40A load before energizing the system.
What to consider before purchase
Verify that your control system provides a 24V AC signal
Ensure the 40A capacity is sufficient for your specific load requirements
Check available space in your distribution board for modular components
Confirm compatibility with existing electrical infrastructure
Usage recommendations
Regularly inspect the contactor for signs of wear or loose connections during routine maintenance of your electrical panel. Ensure the operating environment remains within the specified temperature ranges to maintain optimal performance and longevity.

## Specifications

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.374 kg |

### Design

| Feature | Value |
|---|---|
| Product colour | Multicolour |

## FAQ

### How much does the Siemens 5TT5840-2 Modular Contactor cost, and is it available for purchase?

The price is 133.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 5TT5840-2 Modular Contactor 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

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

## Image

https://aio.lv/img/cache/product/1803829/47591302_large.webp