# F&F ST40-40 Modular Contactor 40A 4NO 230V AC

**URL:** https://aio.lv/en/product--ff-st40-40--12463211
**Data updated:** 2026-05-18 09:33 (EEST)
**Category:** Power Sockets
**Manufacturer:** FF
**Manufacturer code:** ST40-40
**EAN:** 5905857151866
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

The F&F ST40-40 is a high-quality modular contactor designed for reliable electrical circuit switching. Rated for 40A current, it features 4 normally open (NO) contacts and operates on a 230V 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 electrical installations.

## Long description

The F&F ST40-40 modular contactor is a robust electrical switching device engineered for high-performance control in both residential and industrial environments. Designed for seamless integration into standard DIN-rail electrical panels, this contactor provides reliable operation for managing electrical loads up to 40A. With its 4 normally open (NO) contacts and a 230V AC control coil, it serves as a dependable solution for automated switching of various electrical circuits.
Advantages
This modular contactor stands out due to its compact design, which saves valuable space within electrical distribution boards. The high-quality construction ensures durability and long-term operational stability even under frequent switching cycles. Its compatibility with standard DIN-rail mounting systems simplifies installation for electricians and system integrators, while the 40A rating provides sufficient capacity for demanding applications such as lighting control, heating systems, and small motor management.
Suitable for
Lighting circuit control in commercial and residential buildings
Heating and ventilation system automation
Switching of resistive and inductive loads
Integration into industrial control panels
When it may not be suitable
This device is not intended for use in circuits exceeding its 40A rated current capacity or for applications requiring different contact configurations, such as normally closed (NC) contacts. It is also not suitable for environments with extreme moisture or corrosive gases unless housed in an appropriate protective enclosure.
Key specifications
Rated current: 40A
Contact configuration: 4 normally open (NO) contacts
Control voltage: 230V AC
Mounting type: DIN-rail
Modular design for standard distribution boards
How to use
The F&F ST40-40 should be installed by a qualified professional in accordance with local electrical regulations. The device is designed to be snapped onto a standard 35mm DIN-rail. Connect the control voltage supply to the coil terminals and wire the load circuits through the four normally open contacts. Ensure that all terminal screws are tightened to the specified torque to prevent overheating and ensure reliable electrical contact during operation.
What to consider before purchase
Verify that the 230V AC control voltage matches your existing control system
Ensure the 40A current rating is sufficient for the total load of the connected circuits
Check the available space in your distribution board for modular equipment
Confirm that the 4NO contact configuration meets your specific switching requirements
Usage recommendations
Regularly inspect the terminal connections for tightness and ensure the device is kept free from dust and debris to maintain optimal performance and safety.

## FAQ

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. 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/12463211/68764966_large.webp