# F&F Modular Contactor ST40-40/24, 40A, 4NO, 24V AC

**URL:** https://aio.lv/en/product--ff-st40-4024--12453439
**Data updated:** 2026-05-18 02:52 (EEST)
**Category:** Power Sockets
**Manufacturer:** FF
**Manufacturer code:** ST40-40/24
**EAN:** 5908312594208
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 41.49 €
**Prices and availability valid until:** 2026-07-24 23:59
**Price without VAT (21%):** 34.29 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-st40-4024--12453439

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The F&F ST40-40/24 is a high-quality modular contactor designed for reliable electrical circuit switching. Featuring a 40A rated current and 4 normally open (NO) contacts, it operates on a 24V AC control voltage. This device is ideal for industrial and residential automation systems, providing efficient control of lighting, heating, and motor circuits in standard DIN-rail installations.

## Long description

The F&F Modular Contactor ST40-40/24 is a robust electrical switching device engineered for high-performance control in various automation environments. Designed for standard DIN-rail mounting, this contactor facilitates the reliable switching of electrical circuits with a rated current of 40A. It features four normally open (NO) contacts and operates on a 24V AC control voltage, making it a versatile component for managing power distribution in both residential and industrial settings.
Advantages
This modular contactor offers exceptional reliability and durability, ensuring consistent performance even under demanding operational conditions. Its compact design allows for efficient space utilization within electrical distribution boards, while the standardized DIN-rail mounting simplifies the installation process for professionals. The device is built to handle significant electrical loads, providing a stable and secure solution for circuit management without the need for frequent maintenance.
Suitable for
Industrial automation systems
Residential lighting control
Heating and ventilation circuit management
Motor control applications
Power distribution in electrical cabinets
When it may not be suitable
This device is specifically designed for 24V AC control circuits and will not function correctly if connected to DC control voltages or different AC voltage levels. It is not intended for use in environments with extreme moisture or high levels of corrosive dust unless housed in an appropriate protective enclosure.
Key specifications
Rated current: 40A
Contact configuration: 4 normally open (NO) contacts
Control voltage: 24V AC
Mounting type: DIN-rail
Modular design for standard distribution boards
How to use
The contactor should be installed by a qualified electrician onto a standard DIN-rail within an electrical enclosure. Ensure that the power supply is disconnected before beginning the installation. Connect the control wires to the coil terminals and the load wires to the main power contacts according to the wiring diagram provided on the device housing. Once installed, verify all connections for tightness and ensure the control voltage matches the specified 24V AC requirement before energizing the circuit.
What to consider before purchase
Verify that your control system provides a 24V AC signal
Ensure the 40A rated current is sufficient for your specific load requirements
Check available space on your DIN-rail
Confirm the number of contacts meets your circuit design needs
Usage recommendations
Always ensure that the total load connected to the contactor does not exceed the rated 40A capacity to prevent overheating and premature wear of the internal contacts. Regular inspection of terminal connections is recommended to maintain optimal electrical conductivity.

## FAQ

### How much does the Modular Contactor F&F ST40-40/24 \| 40A 4NO 24V AC cost, and is it available for purchase?

The price is 41.49 € (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 14.07.2026 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 FF 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 FF 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

https://aio.lv/img/cache/product/12453439/68755982_large.webp