# F&F Modular Contactor ST25-40-24V, 25A, 4 Normally Open Contacts, 24V AC Coil

**URL:** https://aio.lv/en/product--ff-st25-40-24v--12466337
**Data updated:** 2026-05-18 09:36 (EEST)
**Category:** Control Systems
**Manufacturer:** FF
**Manufacturer code:** ST25-40-24V
**EAN:** 5908312594178
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 32.99 €
**Prices and availability valid until:** 2026-07-12 23:59
**Price without VAT (21%):** 27.26 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-st25-40-24v--12466337

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 03.07.2026 | free |
| Pickup points | 08.07.2026 | 1.99 EUR |
| Courier delivery to door | 08.07.2026 | 4.99 EUR |

## Summary description

The F&F ST25-40-24V is a modular contactor designed for reliable electrical circuit switching. It features a 25A rated current and 4 normally open (4Z) contacts, controlled by a 24V AC coil. This device is ideal for industrial and residential automation, lighting control, and heating systems, ensuring efficient power management in standard DIN-rail mounted electrical installations.

## Long description

The F&F Modular Contactor ST25-40-24V is a high-quality electromechanical switching device engineered for precise control of electrical circuits. Designed for seamless integration into standard distribution boards, this contactor provides a reliable solution for managing power distribution in both residential and industrial environments. With its robust construction and 25A rated current capacity, it ensures consistent performance in demanding electrical applications.
The primary advantage of this modular contactor lies in its reliable switching capability and compact design, which allows for efficient space utilization on a DIN rail. The device features four normally open contacts, providing versatile configuration options for various automation tasks. Its 24V AC coil operation ensures compatibility with low-voltage control systems, enhancing safety and operational flexibility in complex electrical installations.
Suitable for
Residential lighting control systems
Industrial automation and machinery control
Heating and ventilation system management
Power distribution in modular electrical cabinets
This device may not be suitable for applications requiring high-frequency switching beyond its mechanical endurance limits or in environments with extreme vibration. It is also not intended for use in circuits exceeding its 25A rated current capacity or in highly corrosive atmospheres without appropriate protective enclosures.
Key specifications
Rated current: 25A
Contact configuration: 4 normally open (4Z)
Coil voltage: 24V AC
Mounting type: DIN rail (35mm)
Modular design for standard distribution boards
To use the F&F Modular Contactor, mount the device onto a standard 35mm DIN rail within your electrical distribution board. Connect the power supply lines to the main power terminals and wire the 24V AC control signal to the coil terminals. Ensure all connections are tightened securely according to the specified torque requirements to prevent overheating and ensure optimal electrical contact.
What to consider before purchase
Verify that your control system provides a 24V AC signal
Ensure the total load current does not exceed 25A
Check available space on the DIN rail for modular installation
Confirm the compatibility of the 4 normally open contacts with your circuit design
For optimal longevity and performance, ensure the contactor is installed in a well-ventilated enclosure to prevent heat buildup. Regularly inspect the terminal connections for tightness during routine maintenance to maintain electrical integrity.

## FAQ

### How much does the Modular Contactor F&F ST25-40-24V cost, and is it available for purchase?

The price is 32.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 9 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 03.07.2026 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/12466337/68768434_large.webp