# FF CZF-311-TRMS Phase Loss Monitoring Relay

**URL:** https://aio.lv/en/product--ff-czf-311-trms--12461773
**Data updated:** 2026-05-18 09:32 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** FF
**Manufacturer code:** CZF-311-TRMS
**EAN:** 5902431673707
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 32.49 €
**Prices and availability valid until:** 2026-07-19 23:59
**Price without VAT (21%):** 26.85 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-czf-311-trms--12461773

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 13.07.2026 | free |
| Pickup points | 16.07.2026 | 1.99 EUR |
| Courier delivery to door | 16.07.2026 | 4.99 EUR |

## Summary description

The FF CZF-311-TRMS is a professional phase loss monitoring relay designed to protect three-phase electrical equipment. It utilizes TRMS measurement technology to ensure accurate detection of phase loss and asymmetry, preventing damage to motors and sensitive electronics. This reliable relay is essential for industrial and residential electrical installations, providing continuous monitoring and safety for three-phase power systems.

## Long description

The FF CZF-311-TRMS is a professional phase loss monitoring relay engineered to safeguard three-phase electrical equipment from critical power supply failures. By utilizing advanced True RMS (TRMS) measurement technology, this device ensures precise detection of phase loss and voltage asymmetry, even in environments with distorted waveforms. It serves as a vital component for maintaining the operational integrity of motors, pumps, and sensitive electronic systems by disconnecting the load when supply parameters deviate from safe operating limits.
Advantages
The primary advantage of the CZF-311-TRMS is its high measurement accuracy provided by the TRMS sensing method, which allows for reliable operation in installations where voltage harmonics are present. Its robust design ensures consistent performance in both industrial and residential settings, offering a proactive defense against costly equipment damage caused by phase imbalances. The relay is designed for easy integration into standard electrical cabinets, providing a seamless solution for continuous monitoring and enhanced safety of three-phase power networks.
Suitable for
Industrial motor protection systems
Three-phase pump and compressor control
HVAC equipment monitoring
Residential three-phase power distribution boards
Sensitive electronic control panels
This relay may not be suitable for single-phase electrical systems or applications requiring specialized monitoring of frequency variations beyond standard phase loss and asymmetry parameters. It is also not intended for use in high-voltage transmission lines or environments exceeding the specified voltage and current ratings of the device.
Key specifications
Monitoring type: Phase loss and phase asymmetry
Measurement technology: True RMS (TRMS)
System compatibility: Three-phase networks
Mounting: Standard DIN rail
Operational safety: Automatic disconnection upon fault detection
Installation should be performed by a qualified electrician in accordance with local electrical codes. The relay is mounted on a standard DIN rail within an electrical distribution board. Connect the three-phase supply lines to the designated input terminals and wire the control circuit through the relay's output contacts to ensure the equipment is disconnected immediately upon the detection of a phase fault.
What to consider before purchase
Verify that your supply voltage matches the relay specifications
Ensure there is sufficient space on the DIN rail within your enclosure
Confirm that the load current does not exceed the relay's contact rating
Check if your application requires additional monitoring features like phase sequence detection
For optimal performance and longevity, ensure the relay is installed in a clean, dry environment protected from extreme temperatures and excessive vibration. Regularly inspect the terminal connections to ensure they remain tight and free from oxidation.

## FAQ

### How much does the Phase Loss Relay FF CZF-311-TRMS cost, and is it available for purchase?

The price is 32.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 4 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 13.07.2026 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/12461773/68763672_large.webp