# FF phase loss and asymmetry relay CZF-311 10 A 1P 4 s 40–80 V

**URL:** https://aio.lv/en/product--ff-czf-311--12107124
**Data updated:** 2026-03-20 09:57 (EET)
**Category:** Sensors & Detectors
**Manufacturer:** FF
**Manufacturer code:** CZF-311
**EAN:** 5908312593133
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 27.49 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 22.72 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-czf-311--12107124

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 06.07.2026 | free |
| Pickup points | 09.07.2026 | 1.99 EUR |
| Courier delivery to door | 09.07.2026 | 4.99 EUR |

## Summary description

FF CZF-311 is a phase loss and asymmetry protection relay rated for 10 A with a single-pole (1P) output and an adjustable response delay of 4 seconds. Designed for supply voltage detection in the 40–80 V range, it monitors phase presence and balance to protect motors and three-phase equipment from damage caused by phase loss, undervoltage or unbalanced supply conditions. Suitable for industrial and commercial electrical control panels.

## Long description

FF CZF-311 is a phase loss and asymmetry protection relay designed for monitoring three-phase supplies and protecting motors and three-phase equipment from damage due to phase loss, undervoltage or unbalanced voltage conditions. The relay is rated for 10 A with a single-pole (1P) output and has an adjustable response delay set to 4 seconds. It operates with a supply voltage detection range of 40–80 V, making it suitable for lower-voltage three-phase systems in industrial and commercial control panels.
Advantages
The CZF-311 provides reliable phase presence and asymmetry detection with a compact footprint for panel mounting. Its fixed 4-second response delay helps prevent nuisance trips from short transients while still providing timely protection for connected equipment. Designed for straightforward integration, the device offers clear functional behaviour for protection of motors and control circuits in three-phase systems operating within the 40–80 V detection range.
Suitable for
Protection of three-phase motors and pumps against phase loss and unbalance
Monitoring supply presence in industrial and commercial control panels
Integration in motor starters, contactor control circuits and protection schemes
Applications with three-phase systems operating within the 40–80 V detection range
Key specifications
Protection function: phase loss and voltage asymmetry detection
Rated output current: 10 A (single-pole output)
Response delay: 4 seconds (adjustable on unit)
Supply voltage detection range: 40–80 V
Mounting: panel or DIN-rail compatible enclosure (device for control panels)
How to use
Mount the relay in the control panel according to the manufacturer’s installation instructions and wire the phase inputs and output contact in series with the motor starter or control circuit. Set the response delay to the required value if adjustment is provided, and verify the supply voltage is within the 40–80 V detection range prior to commissioning. After wiring, perform functional tests to confirm correct operation: simulate phase loss and asymmetry conditions and observe that the relay interrupts the controlled circuit within the configured delay.
Usage recommendations
Use the CZF-311 together with appropriate overcurrent and thermal protection devices to provide comprehensive equipment protection. Regularly inspect electrical connections and perform periodic functional testing to ensure continued correct detection of phase loss and asymmetry.

## FAQ

### How much does the FF CZF-311 phase loss and asymmetry relay 10A cost, and is it available for purchase?

The price is 27.49 € (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 06.07.2026 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

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