# F&F CZF-312 Phase Loss Monitoring Relay

**URL:** https://aio.lv/en/product--ff-czf-312--12464888
**Data updated:** 2026-05-18 09:27 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** FF
**Manufacturer code:** CZF-312
**EAN:** 5908312593140
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 33.99 €
**Prices and availability valid until:** 2026-07-13 23:59
**Price without VAT (21%):** 28.09 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-czf-312--12464888

## 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

The F&F CZF-312 is a phase loss monitoring relay designed to protect three-phase electrical equipment. It monitors the presence of all three phases and disconnects the load if a phase loss or voltage asymmetry occurs. This device is essential for industrial and residential electrical installations to prevent damage to motors and sensitive electronics caused by phase failure.

## Long description

The F&F CZF-312 phase loss monitoring relay is a reliable protective device engineered to safeguard three-phase electrical equipment from damage caused by phase failure or voltage asymmetry. By continuously monitoring the presence of all three phases, the relay ensures that connected motors and sensitive electronic systems operate within safe parameters, automatically disconnecting the load if an irregularity is detected.
Advantages
This monitoring relay offers robust protection for industrial and residential electrical installations by reacting quickly to power supply instability. Its design focuses on operational safety, preventing costly equipment failures and downtime associated with phase loss. The device is compact, easy to install in standard electrical cabinets, and provides a dependable solution for maintaining the integrity of three-phase power systems.
Suitable for
Three-phase electric motors
Industrial automation systems
HVAC equipment and heat pumps
Residential power distribution boards
Sensitive electronic control panels
When it may not be suitable
This device is not intended for single-phase electrical systems or applications requiring advanced monitoring of frequency fluctuations or harmonic distortion. It does not provide protection against overcurrent or short-circuit conditions, which require separate circuit breakers or fuses.
Key specifications
Supply voltage: 3x400V+N
Monitoring function: Phase loss and voltage asymmetry
Mounting type: DIN rail (TH-35)
Contact configuration: 1 changeover contact
Operating temperature range: -25°C to +50°C
How to use
The relay should be installed by a qualified electrician in a standard distribution board on a 35mm DIN rail. Connect the three phases and the neutral wire to the designated terminals according to the wiring diagram provided on the device housing. Once installed, the relay monitors the input voltage; if all phases are present and within the defined asymmetry threshold, the internal contact closes, allowing the load to operate. If a phase is lost or asymmetry exceeds the limit, the relay will immediately open the contact to protect the connected equipment.
What to consider before purchase
Verify that your electrical system is a three-phase configuration with a neutral wire.
Ensure the load current does not exceed the relay's contact rating.
Check the available space on the DIN rail in your distribution cabinet.
Usage recommendations: Regularly inspect the relay status indicators to ensure the system is operating correctly. It is recommended to perform a functional test during the initial installation to confirm that the relay disconnects the load when a phase is manually interrupted.

## FAQ

### How much does the F&F CZF-312 Phase Loss Monitoring Relay cost, and is it available for purchase?

The price is 33.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 56 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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