# F&F Modular Contactor ST40-31, 40A, 3NO 1NC, 230V AC

**URL:** https://aio.lv/en/product--ff-st40-31--12468778
**Data updated:** 2026-05-18 09:31 (EEST)
**Category:** Power Sockets
**Manufacturer:** FF
**Manufacturer code:** ST40-31
**EAN:** 5908312594185
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 40.49 €
**Prices and availability valid until:** 2026-07-24 23:59
**Price without VAT (21%):** 33.46 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-st40-31--12468778

## 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 ST40-31 is a modular contactor designed for reliable electrical circuit switching. It features a 40A rated current, 3 normally open (NO) contacts, and 1 normally closed (NC) contact, operating at 230V AC. This device is suitable for industrial and residential electrical installations, providing efficient control of lighting, heating, and motor systems in modular distribution boards.

## Long description

The F&F Modular Contactor ST40-31 is a high-performance electromechanical switching device engineered for the reliable control of electrical circuits in both residential and industrial environments. Designed for seamless integration into standard modular distribution boards, this contactor manages high-current loads with precision, ensuring stable operation for various electrical systems. With a rated current of 40A and a configuration of 3 normally open and 1 normally closed contacts, it provides versatile switching capabilities for demanding applications.
Advantages
This modular contactor stands out due to its robust construction and high operational reliability, which are essential for maintaining the integrity of electrical installations. Its compact design allows for efficient space utilization within electrical cabinets, while the standardized mounting system ensures quick and straightforward installation. By facilitating the remote control of high-power circuits, it reduces the load on primary control switches and enhances the overall safety and longevity of the electrical infrastructure.
Suitable for
Control of lighting systems in commercial and residential buildings
Management of heating and ventilation equipment
Switching of small electric motors and pumps
Integration into automated building management systems
This device may not be suitable for applications requiring extremely high switching frequencies or environments with excessive dust, moisture, or corrosive gases, unless housed in an appropriate protective enclosure. It is also not intended for use in circuits exceeding its rated voltage or current specifications, as this could lead to premature failure or safety hazards.
Key specifications
Rated current: 40A
Contact configuration: 3 normally open (NO) and 1 normally closed (NC)
Operating voltage: 230V AC
Mounting type: DIN rail (modular)
To use the contactor, mount it securely onto a standard DIN rail within your distribution board. Connect the control circuit to the coil terminals and the load circuit to the corresponding power terminals, ensuring that all connections are tightened to the manufacturer's specified torque. Verify that the voltage and current ratings of your load do not exceed the device's capacity before energizing the system.
What to consider before purchase
Ensure the contact configuration meets your specific control logic requirements
Verify that the 40A rating is sufficient for your connected load
Check available space in your distribution board for modular mounting
Confirm that the control voltage matches your existing system
For optimal performance and safety, ensure that the contactor is installed by a qualified electrician in accordance with local electrical regulations. Periodically inspect the terminals for tightness and check for any signs of overheating or mechanical wear to maintain long-term reliability.

## FAQ

### How much does the F&F ST40-31 Modular Contactor 40A 3NO 1NC cost, and is it available for purchase?

The price is 40.49 € (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/12468778/68771409_large.webp