# F&F CKF-B-TRMS Phase Sequence and Phase Loss Monitoring Relay

**URL:** https://aio.lv/en/product--ff-ckf-b-trms--12472765
**Data updated:** 2026-05-18 09:41 (EEST)
**Category:** Sensors & Detectors
**Manufacturer:** FF
**Manufacturer code:** CKF-B-TRMS
**EAN:** 5902431673622
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 30.99 €
**Prices and availability valid until:** 2026-07-25 23:59
**Price without VAT (21%):** 25.61 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--ff-ckf-b-trms--12472765

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 14.07.2026 | free |
| Pickup points | 17.07.2026 | 1.89 EUR |
| Courier delivery to door | 17.07.2026 | 4.99 EUR |

## Summary description

The F&F CKF-B-TRMS is a professional phase sequence and phase loss monitoring relay designed to protect three-phase electrical equipment. It features TRMS measurement technology for accurate voltage monitoring, ensuring reliable operation by disconnecting the circuit in case of phase failure or incorrect sequence. Ideal for industrial and commercial power systems requiring high precision and safety.

## Long description

The F&F CKF-B-TRMS is a professional-grade phase sequence and phase loss monitoring relay engineered to safeguard three-phase electrical equipment. By utilizing advanced True RMS (TRMS) measurement technology, this device provides highly accurate voltage monitoring, ensuring that connected machinery remains protected against phase failure, voltage asymmetry, or incorrect phase sequence. It is a robust solution for maintaining the integrity of industrial and commercial power systems where precision and operational safety are critical.
Advantages
The primary advantage of this relay is its ability to perform precise voltage measurements regardless of the waveform shape, thanks to the integrated TRMS technology. This ensures reliable detection of power anomalies that standard monitoring devices might overlook. The unit is designed for seamless integration into electrical panels, offering a compact footprint while providing comprehensive protection that prevents costly damage to motors and other sensitive three-phase equipment. Its reliable switching mechanism ensures that the circuit is disconnected immediately upon detecting a fault, minimizing downtime and potential hazards.
Suitable for
Industrial motor protection
Commercial HVAC systems
Three-phase power distribution panels
Automation and control systems
Backup power supply monitoring
When it may not be suitable
This device is specifically designed for three-phase systems and is not suitable for single-phase electrical installations. Furthermore, it should not be used in environments where voltage fluctuations exceed the specified operational range of the relay, as this may lead to frequent nuisance tripping or failure to protect the equipment correctly.
Key specifications
Measurement type: True RMS (TRMS)
Monitored parameters: Phase sequence and phase loss
System type: Three-phase
Protection function: Circuit disconnection upon fault detection
Application: Industrial and commercial power systems
How to use
The relay should be installed by a qualified professional within a standard electrical distribution board. Connect the three-phase supply lines to the designated input terminals according to the wiring diagram provided with the device. Once installed, the relay continuously monitors the incoming voltage phases. If the phase sequence is incorrect or if a phase is lost, the internal relay contacts will open, effectively cutting off power to the protected equipment to prevent damage. The device operates automatically without the need for manual intervention once configured.
What to consider before purchase
Verify that your electrical system is a three-phase configuration
Ensure the voltage levels of your installation match the relay specifications
Confirm that the mounting space in your distribution board is sufficient
Check if your application requires additional protection features beyond phase monitoring
Usage recommendations
Regularly inspect the relay status indicators to ensure the system is operating within normal parameters. It is recommended to perform periodic testing of the protection circuit to confirm that the relay successfully disconnects the load during simulated fault conditions.

## FAQ

### How much does the F&F CKF-B-TRMS Phase Monitoring Relay cost, and is it available for purchase?

The price is 30.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 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 14.07.2026 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/12472765/68791914_large.webp