# FF PSR-440 Modular Rotary Changeover Switch I-0-II 40A 4P

**URL:** https://aio.lv/en/product--ff-psr-440--12447568
**Data updated:** 2026-05-18 02:43 (EEST)
**Category:** Power Sockets
**Manufacturer:** FF
**Manufacturer code:** PSR-440
**EAN:** 5902431675299
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 142.49 €
**Prices and availability valid until:** 2026-07-11 23:59
**Price without VAT (21%):** 117.76 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-psr-440--12447568

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 02.07.2026 | free |
| Pickup points | 07.07.2026 | 1.99 EUR |
| Courier delivery to door | 07.07.2026 | 4.99 EUR |

## Summary description

The FF PSR-440 is a 4-pole modular rotary changeover switch designed for I-0-II (mains-generator) switching applications. With a rated current of 40A, this device ensures reliable manual power source selection in electrical distribution systems. Its compact modular design allows for easy DIN-rail mounting, making it an essential component for residential and industrial power management setups requiring safe and efficient switching between power supplies.

## Long description

The FF PSR-440 is a high-quality 4-pole modular rotary changeover switch engineered for reliable I-0-II power source switching. Designed to facilitate seamless transitions between two power supplies, such as a primary mains grid and a backup generator, this device ensures consistent electrical distribution. Its robust construction and 40A rated current capacity make it a dependable solution for managing power inputs in various electrical installations.
Advantages
This rotary switch offers a compact modular design that significantly simplifies installation within standard electrical cabinets. By utilizing a DIN-rail mounting system, it integrates effortlessly into existing distribution boards. The clear I-0-II switching logic provides intuitive operation, while the 4-pole configuration ensures that all phases and the neutral line are safely disconnected or switched, enhancing overall system safety and preventing electrical feedback between sources.
Suitable for
Residential backup power systems
Small-scale industrial power management
Switching between mains and generator power
Manual control of electrical supply sources
This device is not intended for high-voltage industrial applications exceeding its 40A rating or for environments requiring automated, remote-controlled switching, as it is strictly a manual operation unit. It should not be used in circuits where the load exceeds the specified current capacity, as this could lead to overheating or mechanical failure.
Key specifications
Number of poles: 4
Rated current: 40A
Switching positions: I-0-II
Mounting type: DIN-rail
Design: Modular rotary
To operate the switch, rotate the handle to the desired position: I for the primary source, 0 for the neutral off position, and II for the secondary source. Ensure that the electrical system is fully de-energized before performing any installation or maintenance tasks. The switch should be installed by a qualified electrician to ensure all wiring connections are secure and compliant with local electrical safety standards.
What to consider before purchase
Verify that the 40A current rating is sufficient for your total load
Ensure your electrical panel has enough space for a modular DIN-rail device
Confirm that your system requires a 4-pole switching configuration
For optimal performance and safety, regularly inspect the switch for any signs of wear or loose connections and ensure that the switch is kept in a clean, dry environment free from excessive dust or moisture.

## FAQ

### How much does the FF PSR-440 Modular Rotary Changeover Switch 40A 4P cost, and is it available for purchase?

The price is 142.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 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 02.07.2026 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 FF PSR-440 Modular Rotary Changeover Switch 40A 4P 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 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/12447568/68750620_large.webp